Add suppport for sn65dsi86 bridge chip

Add support for TI's sn65dsi86 dsi2edp bridge chip. The chip converts DSI transmitted signal to eDP signal, which is fed to the connected eDP panel.

This chip can be controlled via either i2c interface or dsi interface. Currently in driver all the control registers are being accessed through i2c interface only. Also as of now HPD support has not been added to bridge chip driver.

Changes in v1:
- Split the dt-bindings and the driver support into separate patches (Andrzej Hajda).
- Use of gpiod APIs to parse and configure gpios instead of obsolete ones (Andrzej Hajda).
- Use macros to define the register offsets (Andrzej Hajda).

Changes in v2:
- Separate out edp panel specific HW resource handling from bridge driver and create a separate edp panel drivers to handle panel specific mode information and HW resources (Sean Paul).
- Replace pr_* APIs to DRM_* APIs to log error or debug information (Sean Paul).
- Remove some of the unnecessary structure/variable from driver (Sean

    Paul).

- Rename the function and structure prefix "sn65dsi86" to "ti_sn_bridge" (Sean Paul / Rob Herring).
- Remove most of the hard-coding and modified the bridge init sequence based on current mode (Sean Paul).
- Remove the existing function to retrieve the EDID data and implemented this as an i2c_adapter and use drm_get_edid() (Sean Paul).
- Remove the dummy irq handler implementation, will add back the proper irq handling later (Sean Paul).
- Capture the required enable gpios in a single array based on dt entry instead of having individual descriptor for each gpio (Sean Paul).

Changes in v3:
- Remove usage of irq_gpio and replace it as "interrupts" property (Rob Herring).
- Remove the unnecessary header file inclusions (Sean Paul).
- Rearrange the header files in alphabetical order (Sean Paul).
- Use regmap interface to perform i2c transactions.
- Update Copyright/License field and address other review comments (Jordan Crouse).

Changes in v4:
- Update License/Copyright (Sean Paul).
- Add Kconfig and Makefile changes (Sean Paul).
- Drop i2c gpio handling from this bridge driver, since i2c sda/scl gpios will be handled by i2c master.
- Update required supplies names.
- Remove unnecessary goto statements (Sean Paul).
- Add mutex lock to power_ctrl API to avoid race conditions (Sean

    Paul).

- Add support to parse reference clk frequency from dt(optional).
- Update the bridge chip enable/disable sequence.

Changes in v5:
- Fixed Kbuild test service reported warnings.

Changes in v6:
- Use PM runtime based ref-counting instead of local ref_count mechanism (Stephen Boyd).
- Clean up some debug logs and indentations (Sean Paul).
- Simplify dp rate calculation (Sean Paul).
- Add support to configure refclk based on input REFCLK pin or DACP/N pin (Stephen Boyd).

Changes in v7:
- Use static supply entries instead of dynamic allocation (Andrzej

    Hajda).
  - Defer bridge driver probe if panel is not probed (Andrzej Hajda).
  - Update of_graph APIs for correct node reference management. (Andrzej
    Hajda).

- Remove local display_mode object (Andrzej Hajda).
- Remove version id check function from driver.

Changes in v8:
- Move dsi register/attach function to bridge driver probe (Andrzej

    Hajda).

- Introduce a new helper function to write 16bit words into consecutive registers (Andrzej Hajda).
- Remove unnecessary macros (Andrzej Hajda).

Changes in v9:
- Remove dsi register/attach from bridge probe, since dsi dev register completion also waits for any panel or bridge to get added. This creates deadlock situation when bridge driver calls dsi dev register and attach before bridge add, in its probe function.
- Fix issues faced during testing of bridge driver on actual HW.
- Remove unnecessary initializations (Stephen Boyd).
- Use local refclk lut size instead of global macro (Sean Paul).

Changes in v10:
- Use refclk to determine if continuous dsi clock is needed or not.

Changes in v11:
- Read DPPLL_SRC register to determine continuous clock instead of using refclk handle (Stephen Boyd).

Changes in v12:
- Explain in comment as in why dsi dev registration is done in bridge_attach (Andrzej Hajda).
- Move HPD disable to bridge_pre_enable (Andrzej Hajda).
- Make panel/DDC exclusive until HPD support is added (Andrzej Hajda).

Changes in v13:
- eDP panels report EDID via DP-AUX channel, so remove support for dedicated DDC line (Andrzej Hajda).

Signed-off-by Sandeep Panda <[email protected]>

---
  drivers/gpu/drm/bridge/Kconfig        |   9 +
  drivers/gpu/drm/bridge/Makefile       |   1 +
  drivers/gpu/drm/bridge/ti-sn65dsi86.c | 676 ++++++++++++++++++++++++++++++++++
  3 files changed, 686 insertions(+)

create mode 100644 drivers/gpu/drm/bridge/ti-sn65dsi86.c

drivers/gpu/drm/bridge/Kconfig +9 -0

index 3b99d5a06c16..8153150acd36 100644
@@ -108,6 +108,15 @@ config DRM_TI_TFP410
  	---help---
  	  Texas Instruments TFP410 DVI/HDMI Transmitter driver
 
+config DRM_TI_SN65DSI86
+	tristate "TI SN65DSI86 DSI to eDP bridge"
+	depends on OF
+	select DRM_KMS_HELPER
+	select REGMAP_I2C
+	select DRM_PANEL
+	---help---
+	  Texas Instruments SN65DSI86 DSI to eDP Bridge driver
+
  source "drivers/gpu/drm/bridge/analogix/Kconfig"
 
  source "drivers/gpu/drm/bridge/adv7511/Kconfig"

drivers/gpu/drm/bridge/Makefile +1 -0

index 373eb28f31ed..a7ca000f6048 100644
@@ -11,5 +11,6 @@ obj-$(CONFIG_DRM_SII9234) += sii9234.o
  obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
  obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix/
  obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
+obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
  obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
  obj-y += synopsys/

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +176 -0

new file mode 100644
index 000000000000..2f560e3a1460
@@ -0,0 +1,676 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <linux/clk.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/of_graph.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+/* Link Training specific registers */
+#define SN_DEVICE_REV_REG			0x08
+#define SN_HPD_DISABLE_REG			0x5C
+#define SN_DPPLL_SRC_REG			0x0A
+#define SN_DSI_LANES_REG			0x10
+#define SN_DSIA_CLK_FREQ_REG			0x12
+#define SN_ENH_FRAME_REG			0x5A
+#define SN_SSC_CONFIG_REG			0x93
+#define SN_DATARATE_CONFIG_REG			0x94
+#define SN_PLL_ENABLE_REG			0x0D
+#define SN_SCRAMBLE_CONFIG_REG			0x95
+#define SN_AUX_WDATA0_REG			0x64
+#define SN_AUX_ADDR_19_16_REG			0x74
+#define SN_AUX_ADDR_15_8_REG			0x75
+#define SN_AUX_ADDR_7_0_REG			0x76
+#define SN_AUX_LENGTH_REG			0x77
+#define SN_AUX_CMD_REG				0x78
+#define SN_ML_TX_MODE_REG			0x96
+/* video config specific registers */
+#define SN_CHA_ACTIVE_LINE_LENGTH_LOW_REG	0x20
+#define SN_CHA_VERTICAL_DISPLAY_SIZE_LOW_REG	0x24
+#define SN_CHA_HSYNC_PULSE_WIDTH_LOW_REG	0x2C
+#define SN_CHA_HSYNC_PULSE_WIDTH_HIGH_REG	0x2D
+#define SN_CHA_VSYNC_PULSE_WIDTH_LOW_REG	0x30
+#define SN_CHA_VSYNC_PULSE_WIDTH_HIGH_REG	0x31
+#define SN_CHA_HORIZONTAL_BACK_PORCH_REG	0x34
+#define SN_CHA_VERTICAL_BACK_PORCH_REG		0x36
+#define SN_CHA_HORIZONTAL_FRONT_PORCH_REG	0x38
+#define SN_CHA_VERTICAL_FRONT_PORCH_REG		0x3A
+#define SN_DATA_FORMAT_REG			0x5B
+
+#define MIN_DSI_CLK_FREQ_MHZ	40
+
+/* fudge factor required to account for 8b/10b encoding */
+#define DP_CLK_FUDGE_NUM	10
+#define DP_CLK_FUDGE_DEN	8
+
+#define DPPLL_CLK_SRC_REFCLK	0
+#define DPPLL_CLK_SRC_DSICLK	1
+
+#define SN_REFCLK_FREQ_OFFSET	1
+#define SN_DSIA_LANE_OFFSET	3
+#define SN_DP_LANE_OFFSET	4
+#define SN_DP_DATA_RATE_OFFSET	5
+#define SN_SYNC_POLARITY_OFFSET	7
+
+#define SN_ENABLE_VID_STREAM_BIT	BIT(3)
+#define SN_REFCLK_FREQ_BITS		GENMASK(3, 1)
+#define SN_DSIA_NUM_LANES_BITS		GENMASK(4, 3)
+#define SN_DP_NUM_LANES_BITS		GENMASK(5, 4)
+#define SN_DP_DATA_RATE_BITS		GENMASK(7, 5)
+#define SN_HPD_DISABLE_BIT		BIT(0)
+
+#define SN_REGULATOR_SUPPLY_NUM		4
+
+struct ti_sn_bridge {
+	struct device			*dev;
+	struct regmap			*regmap;
+	struct drm_bridge		bridge;
+	struct drm_connector		connector;
+	struct device_node		*host_node;
+	struct mipi_dsi_device		*dsi;
+	struct clk			*refclk;
+	struct drm_panel		*panel;
+	struct gpio_desc		*enable_gpio;
+	struct regulator_bulk_data	supplies[SN_REGULATOR_SUPPLY_NUM];
+};
+
+static const struct regmap_range ti_sn_bridge_volatile_ranges[] = {
+	{ .range_min = 0, .range_max = 0xFF },
+};
+
+static const struct regmap_access_table ti_sn_bridge_volatile_table = {
+	.yes_ranges = ti_sn_bridge_volatile_ranges,
+	.n_yes_ranges = ARRAY_SIZE(ti_sn_bridge_volatile_ranges),
+};
+
+static const struct regmap_config ti_sn_bridge_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.volatile_table = &ti_sn_bridge_volatile_table,
+	.cache_type = REGCACHE_NONE,
+};
+
+static void ti_sn_bridge_write_u16(struct ti_sn_bridge *pdata,
+				   unsigned int reg, u16 val)
+{
+	regmap_write(pdata->regmap, reg, val & 0xFF);
+	regmap_write(pdata->regmap, reg + 1, val >> 8);
+}
+
+static int __maybe_unused ti_sn_bridge_resume(struct device *dev)
+{
+	struct ti_sn_bridge *pdata = dev_get_drvdata(dev);
+	int ret;
+
+	ret = regulator_bulk_enable(SN_REGULATOR_SUPPLY_NUM, pdata->supplies);
+	if (ret) {
+		DRM_ERROR("failed to enable supplies %d\n", ret);
+		return ret;
+	}
+
+	gpiod_set_value(pdata->enable_gpio, 1);
+
+	return ret;
+}
+
+static int __maybe_unused ti_sn_bridge_suspend(struct device *dev)
+{
+	struct ti_sn_bridge *pdata = dev_get_drvdata(dev);
+	int ret;
+
+	gpiod_set_value(pdata->enable_gpio, 0);
+
+	ret = regulator_bulk_disable(SN_REGULATOR_SUPPLY_NUM, pdata->supplies);
+	if (ret)
+		DRM_ERROR("failed to disable supplies %d\n", ret);
+
+	return ret;
+}
+
+static const struct dev_pm_ops ti_sn_bridge_pm_ops = {
+	SET_RUNTIME_PM_OPS(ti_sn_bridge_suspend, ti_sn_bridge_resume, NULL)
+};
+
+/* Connector funcs */
+static struct ti_sn_bridge *
+connector_to_ti_sn_bridge(struct drm_connector *connector)
+{
+	return container_of(connector, struct ti_sn_bridge, connector);
+}
+
+static int ti_sn_bridge_connector_get_modes(struct drm_connector *connector)
+{
+	struct ti_sn_bridge *pdata = connector_to_ti_sn_bridge(connector);
+
+	return drm_panel_get_modes(pdata->panel);
+}
+
+static enum drm_mode_status
+ti_sn_bridge_connector_mode_valid(struct drm_connector *connector,
+			     struct drm_display_mode *mode)
+{
+	/* maximum supported resolution is 4K at 60 fps */
+	if (mode->clock > 594000)
+		return MODE_CLOCK_HIGH;
+
+	return MODE_OK;
+}
+
+static struct drm_connector_helper_funcs ti_sn_bridge_connector_helper_funcs = {
+	.get_modes = ti_sn_bridge_connector_get_modes,
+	.mode_valid = ti_sn_bridge_connector_mode_valid,
+};
+
+static enum drm_connector_status

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +440 -0

+		return connector_status_connected;
+	else
+		return connector_status_unknown;
+}
+
+static const struct drm_connector_funcs ti_sn_bridge_connector_funcs = {
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.detect = ti_sn_bridge_connector_detect,
+	.destroy = drm_connector_cleanup,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static struct ti_sn_bridge *bridge_to_ti_sn_bridge(struct drm_bridge *bridge)
+{
+	return container_of(bridge, struct ti_sn_bridge, bridge);
+}
+
+static int ti_sn_bridge_parse_regulators(struct ti_sn_bridge *pdata)
+{
+	unsigned int i;
+	const char * const ti_sn_bridge_supply_names[] = {
+		"vcca", "vcc", "vccio", "vpll",
+	};
+
+	for (i = 0; i < SN_REGULATOR_SUPPLY_NUM; i++)
+		pdata->supplies[i].supply = ti_sn_bridge_supply_names[i];
+
+	return devm_regulator_bulk_get(pdata->dev, SN_REGULATOR_SUPPLY_NUM,
+				       pdata->supplies);
+}
+
+static int ti_sn_bridge_attach(struct drm_bridge *bridge)
+{
+	int ret, val;
+	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+	struct mipi_dsi_host *host;
+	struct mipi_dsi_device *dsi;
+	const struct mipi_dsi_device_info info = { .type = "ti_sn_bridge",
+						   .channel = 0,
+						   .node = NULL,
+						 };
+
+	ret = drm_connector_init(bridge->dev, &pdata->connector,
+				 &ti_sn_bridge_connector_funcs,
+				 DRM_MODE_CONNECTOR_eDP);
+	if (ret) {
+		DRM_ERROR("Failed to initialize connector with drm\n");
+		return ret;
+	}
+
+	drm_connector_helper_add(&pdata->connector,
+				 &ti_sn_bridge_connector_helper_funcs);
+	drm_mode_connector_attach_encoder(&pdata->connector, bridge->encoder);
+
+	/*
+	 * TODO: ideally finding host resource and dsi dev registration needs
+	 * to be done in bridge probe. But some existing DSI host drivers will
+	 * wait for any of the drm_bridge/drm_panel to get added to the global
+	 * bridge/panel list, before completing their probe. So if we do the
+	 * dsi dev registration part in bridge probe, before populating in
+	 * the global bridge list, then it will cause deadlock as dsi host probe
+	 * will never complete, neither our bridge probe. So keeping it here
+	 * will satisfy most of the existing host drivers. Once the host driver
+	 * is fixed we can move the below code to bridge probe safely.
+	 */
+	host = of_find_mipi_dsi_host_by_node(pdata->host_node);
+	if (!host) {
+		DRM_ERROR("failed to find dsi host\n");
+		ret = -ENODEV;
+		goto err_dsi_host;
+	}
+
+	dsi = mipi_dsi_device_register_full(host, &info);
+	if (IS_ERR(dsi)) {
+		DRM_ERROR("failed to create dsi device\n");
+		ret = PTR_ERR(dsi);
+		goto err_dsi_host;
+	}
+
+	/* TODO: setting to 4 lanes always for now */
+	dsi->lanes = 4;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+			  MIPI_DSI_MODE_EOT_PACKET | MIPI_DSI_MODE_VIDEO_HSE;
+
+	/* check if continuous dsi clock is required or not */
+	pm_runtime_get_sync(pdata->dev);
+	regmap_read(pdata->regmap, SN_DPPLL_SRC_REG, &val);
+	pm_runtime_put(pdata->dev);
+	if (!(val & DPPLL_CLK_SRC_DSICLK))
+		dsi->mode_flags |= MIPI_DSI_CLOCK_NON_CONTINUOUS;
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		DRM_ERROR("failed to attach dsi to host\n");
+		goto err_dsi_attach;
+	}
+	pdata->dsi = dsi;
+
+	/* attach panel to bridge */
+	if (pdata->panel)
+		drm_panel_attach(pdata->panel, &pdata->connector);
+
+	return 0;
+
+err_dsi_attach:
+	mipi_dsi_device_unregister(dsi);
+err_dsi_host:
+	drm_connector_cleanup(&pdata->connector);
+	return ret;
+}
+
+static void ti_sn_bridge_disable(struct drm_bridge *bridge)
+{
+	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+
+	if (pdata->panel)
+		drm_panel_disable(pdata->panel);
+
+	/* disable video stream */
+	regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG,
+			   SN_ENABLE_VID_STREAM_BIT, 0);
+	/* semi auto link training mode OFF */
+	regmap_write(pdata->regmap, SN_ML_TX_MODE_REG, 0);
+	/* disable DP PLL */
+	regmap_write(pdata->regmap, SN_PLL_ENABLE_REG, 0);
+
+	if (pdata->panel)
+		drm_panel_unprepare(pdata->panel);
+}
+
+static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn_bridge *pdata)
+{
+	u32 bit_rate_khz, clk_freq_khz;
+	struct drm_display_mode *mode =
+		&pdata->bridge.encoder->crtc->state->adjusted_mode;
+
+	bit_rate_khz = mode->clock *
+			mipi_dsi_pixel_format_to_bpp(pdata->dsi->format);
+	clk_freq_khz = bit_rate_khz / (pdata->dsi->lanes * 2);
+
+	return clk_freq_khz;
+}
+
+/* clk frequencies supported by bridge in Hz in case derived from REFCLK pin */
+static const u32 ti_sn_bridge_refclk_lut[] = {
+	12000000,
+	19200000,
+	26000000,
+	27000000,
+	38400000,
+};
+
+/* clk frequencies supported by bridge in Hz in case derived from DACP/N pin */
+static const u32 ti_sn_bridge_dsiclk_lut[] = {
+	468000000,
+	384000000,
+	416000000,
+	486000000,
+	460800000,
+};
+
+static void ti_sn_bridge_set_refclk_freq(struct ti_sn_bridge *pdata)
+{
+	int i;
+	u32 refclk_rate;
+	const u32 *refclk_lut;
+	size_t refclk_lut_size;
+
+	if (pdata->refclk) {
+		refclk_rate = clk_get_rate(pdata->refclk);
+		refclk_lut = ti_sn_bridge_refclk_lut;
+		refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_refclk_lut);
+		clk_prepare_enable(pdata->refclk);
+	} else {
+		refclk_rate = ti_sn_bridge_get_dsi_freq(pdata) * 1000;
+		refclk_lut = ti_sn_bridge_dsiclk_lut;
+		refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_dsiclk_lut);
+	}
+
+	/* for i equals to refclk_lut_size means default frequency */
+	for (i = 0; i < refclk_lut_size; i++)
+		if (refclk_lut[i] == refclk_rate)
+			break;
+
+	regmap_update_bits(pdata->regmap, SN_DPPLL_SRC_REG,
+			   SN_REFCLK_FREQ_BITS, i << SN_REFCLK_FREQ_OFFSET);
+}
+
+/**
+ * LUT index corresponds to register value and
+ * LUT values corresponds to dp data rate supported
+ * by the bridge in Mbps unit.
+ */
+static const unsigned int ti_sn_bridge_dp_rate_lut[] = {
+	0, 1620, 2160, 2430, 2700, 3240, 4320, 5400
+};
+
+static void ti_sn_bridge_set_dsi_dp_rate(struct ti_sn_bridge *pdata)
+{
+	unsigned int bit_rate_mhz, clk_freq_mhz, dp_rate_mhz;
+	unsigned int val, i;
+	struct drm_display_mode *mode =
+		&pdata->bridge.encoder->crtc->state->adjusted_mode;
+
+	/* set DSIA clk frequency */
+	bit_rate_mhz = (mode->clock / 1000) *
+			mipi_dsi_pixel_format_to_bpp(pdata->dsi->format);
+	clk_freq_mhz = bit_rate_mhz / (pdata->dsi->lanes * 2);
+
+	/* for each increment in val, frequency increases by 5MHz */
+	val = (MIN_DSI_CLK_FREQ_MHZ / 5) +
+		(((clk_freq_mhz - MIN_DSI_CLK_FREQ_MHZ) / 5) & 0xFF);
+	regmap_write(pdata->regmap, SN_DSIA_CLK_FREQ_REG, val);
+
+	/* set DP data rate */
+	dp_rate_mhz = ((bit_rate_mhz / pdata->dsi->lanes) * DP_CLK_FUDGE_NUM) /
+							DP_CLK_FUDGE_DEN;
+	for (i = 0; i < ARRAY_SIZE(ti_sn_bridge_dp_rate_lut) - 1; i++)
+		if (ti_sn_bridge_dp_rate_lut[i] > dp_rate_mhz)
+			break;
+
+	regmap_update_bits(pdata->regmap, SN_DATARATE_CONFIG_REG,
+			   SN_DP_DATA_RATE_BITS, i << SN_DP_DATA_RATE_OFFSET);
+}
+
+static void ti_sn_bridge_set_video_timings(struct ti_sn_bridge *pdata)
+{
+	struct drm_display_mode *mode =
+		&pdata->bridge.encoder->crtc->state->adjusted_mode;
+	u8 hsync_polarity = 0, vsync_polarity = 0;
+
+	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
+		hsync_polarity = BIT(SN_SYNC_POLARITY_OFFSET);
+	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
+		vsync_polarity = BIT(SN_SYNC_POLARITY_OFFSET);
+
+	ti_sn_bridge_write_u16(pdata, SN_CHA_ACTIVE_LINE_LENGTH_LOW_REG,
+			       mode->hdisplay);
+	ti_sn_bridge_write_u16(pdata, SN_CHA_VERTICAL_DISPLAY_SIZE_LOW_REG,
+			       mode->vdisplay);
+	regmap_write(pdata->regmap, SN_CHA_HSYNC_PULSE_WIDTH_LOW_REG,
+		     (mode->hsync_end - mode->hsync_start) & 0xFF);
+	regmap_write(pdata->regmap, SN_CHA_HSYNC_PULSE_WIDTH_HIGH_REG,
+		     (((mode->hsync_end - mode->hsync_start) >> 8) & 0x7F) |
+		     hsync_polarity);
+	regmap_write(pdata->regmap, SN_CHA_VSYNC_PULSE_WIDTH_LOW_REG,
+		     (mode->vsync_end - mode->vsync_start) & 0xFF);
+	regmap_write(pdata->regmap, SN_CHA_VSYNC_PULSE_WIDTH_HIGH_REG,
+		    (((mode->vsync_end - mode->vsync_start) >> 8) & 0x7F) |
+		    vsync_polarity);
+
+	regmap_write(pdata->regmap, SN_CHA_HORIZONTAL_BACK_PORCH_REG,
+		     (mode->htotal - mode->hsync_end) & 0xFF);
+	regmap_write(pdata->regmap, SN_CHA_VERTICAL_BACK_PORCH_REG,
+		     (mode->vtotal - mode->vsync_end) & 0xFF);
+
+	regmap_write(pdata->regmap, SN_CHA_HORIZONTAL_FRONT_PORCH_REG,
+		     (mode->hsync_start - mode->hdisplay) & 0xFF);
+	regmap_write(pdata->regmap, SN_CHA_VERTICAL_FRONT_PORCH_REG,
+		     (mode->vsync_start - mode->vdisplay) & 0xFF);
+
+	usleep_range(10000, 10500); /* 10ms delay recommended by spec */
+}
+
+static void ti_sn_bridge_enable(struct drm_bridge *bridge)
+{
+	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+	unsigned int val;
+
+	if (pdata->panel)
+		drm_panel_prepare(pdata->panel);
+
+	/* DSI_A lane config */
+	val = (4 - pdata->dsi->lanes) << SN_DSIA_LANE_OFFSET;
+	regmap_update_bits(pdata->regmap, SN_DSI_LANES_REG,
+			   SN_DSIA_NUM_LANES_BITS, val);
+
+	/* DP lane config */
+	val = (pdata->dsi->lanes - 1) << SN_DP_LANE_OFFSET;
+	regmap_update_bits(pdata->regmap, SN_SSC_CONFIG_REG,
+			   SN_DP_NUM_LANES_BITS, val);
+
+	/* set dsi/dp clk frequency value */
+	ti_sn_bridge_set_dsi_dp_rate(pdata);
+
+	/* enable DP PLL */
+	regmap_write(pdata->regmap, SN_PLL_ENABLE_REG, 1);
+	usleep_range(10000, 10500); /* 10ms delay recommended by spec */
+
+	/**
+	 * The SN65DSI86 only supports ASSR Display Authentication method and
+	 * this method is enabled by default. An eDP panel must support this
+	 * authentication method. We need to enable this method in the eDP panel
+	 * at DisplayPort address 0x0010A prior to link training.
+	 */
+	regmap_write(pdata->regmap, SN_AUX_WDATA0_REG, 0x01);
+	regmap_write(pdata->regmap, SN_AUX_ADDR_19_16_REG, 0x00);
+	regmap_write(pdata->regmap, SN_AUX_ADDR_15_8_REG, 0x01);
+	regmap_write(pdata->regmap, SN_AUX_ADDR_7_0_REG, 0x0A);
+	regmap_write(pdata->regmap, SN_AUX_LENGTH_REG, 0x01);
+	regmap_write(pdata->regmap, SN_AUX_CMD_REG, 0x81);
+	usleep_range(10000, 10500); /* 10ms delay recommended by spec */
+
+	/* Semi auto link training mode */
+	regmap_write(pdata->regmap, SN_ML_TX_MODE_REG, 0x0A);
+	msleep(20); /* 20ms delay recommended by spec */
+
+	/* config video parameters */
+	ti_sn_bridge_set_video_timings(pdata);
+
+	/* enable video stream */
+	regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG,
+			   SN_ENABLE_VID_STREAM_BIT, SN_ENABLE_VID_STREAM_BIT);
+
+	if (pdata->panel)
+		drm_panel_enable(pdata->panel);
+}
+
+static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge)
+{
+	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+
+	pm_runtime_get_sync(pdata->dev);
+
+	/* configure bridge ref_clk */
+	ti_sn_bridge_set_refclk_freq(pdata);
+
+	/* in case drm_panel is connected then HPD is not supported */
+	if (pdata->panel)
+		regmap_update_bits(pdata->regmap, SN_HPD_DISABLE_REG,
+				   SN_HPD_DISABLE_BIT, SN_HPD_DISABLE_BIT);
+}
+
+static void ti_sn_bridge_post_disable(struct drm_bridge *bridge)
+{
+	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+
+	if (pdata->refclk)
+		clk_disable_unprepare(pdata->refclk);
+
+	pm_runtime_put_sync(pdata->dev);
+}
+
+static const struct drm_bridge_funcs ti_sn_bridge_funcs = {
+	.attach = ti_sn_bridge_attach,
+	.pre_enable = ti_sn_bridge_pre_enable,
+	.enable = ti_sn_bridge_enable,
+	.disable = ti_sn_bridge_disable,
+	.post_disable = ti_sn_bridge_post_disable,
+};
+
+static int ti_sn_bridge_parse_dsi_host(struct ti_sn_bridge *pdata)
+{
+	struct device_node *np = pdata->dev->of_node;
+
+	pdata->host_node = of_graph_get_remote_node(np, 0, 0);
+
+	if (!pdata->host_node) {
+		DRM_ERROR("remote dsi host node not found\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int ti_sn_bridge_probe(struct i2c_client *client,
+	 const struct i2c_device_id *id)
+{
+	struct ti_sn_bridge *pdata;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		DRM_ERROR("device doesn't support I2C\n");
+		return -ENODEV;
+	}
+
+	pdata = devm_kzalloc(&client->dev, sizeof(struct ti_sn_bridge),
+			     GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	pdata->regmap = devm_regmap_init_i2c(client,
+					     &ti_sn_bridge_regmap_config);
+	if (IS_ERR(pdata->regmap)) {
+		DRM_ERROR("regmap i2c init failed\n");
+		return PTR_ERR(pdata->regmap);
+	}
+
+	pdata->dev = &client->dev;
+
+	ret = drm_of_find_panel_or_bridge(pdata->dev->of_node, 1, 0,
+					  &pdata->panel, NULL);
+	if (ret) {
+		DRM_ERROR("could not find any panel node\n");
+		return ret;
+	}
+
+	dev_set_drvdata(&client->dev, pdata);
+
+	pdata->enable_gpio = devm_gpiod_get(pdata->dev, "enable",
+					    GPIOD_OUT_LOW);
+	if (IS_ERR(pdata->enable_gpio)) {
+		DRM_ERROR("failed to get enable gpio from DT\n");
+		ret = PTR_ERR(pdata->enable_gpio);
+		return ret;
+	}
+
+	ret = ti_sn_bridge_parse_regulators(pdata);
+	if (ret) {
+		DRM_ERROR("failed to parse regulators\n");
+		return ret;
+	}
+
+	pdata->refclk = devm_clk_get(pdata->dev, "refclk");
+	if (IS_ERR(pdata->refclk)) {
+		ret = PTR_ERR(pdata->refclk);
+		if (ret == -EPROBE_DEFER)
+			return ret;
+		DRM_DEBUG_KMS("refclk not found\n");
+		pdata->refclk = NULL;
+	}
+
+	ret = ti_sn_bridge_parse_dsi_host(pdata);
+	if (ret)
+		return ret;
+
+	pm_runtime_enable(pdata->dev);
+
+	i2c_set_clientdata(client, pdata);
+
+	pdata->bridge.funcs = &ti_sn_bridge_funcs;
+	pdata->bridge.of_node = client->dev.of_node;
+
+	drm_bridge_add(&pdata->bridge);
+
+	return 0;
+}

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +26 -0

+		mipi_dsi_detach(pdata->dsi);
+		mipi_dsi_device_unregister(pdata->dsi);
+	}
+
+	drm_bridge_remove(&pdata->bridge);
+
+	return 0;
+}
+
+static struct i2c_device_id ti_sn_bridge_id[] = {
+	{ "ti,sn65dsi86", 0},
+	{},
+};
+MODULE_DEVICE_TABLE(i2c, ti_sn_bridge_id);
+
+static const struct of_device_id ti_sn_bridge_match_table[] = {
+	{.compatible = "ti,sn65dsi86"},
+	{},
+};
+MODULE_DEVICE_TABLE(of, ti_sn_bridge_match_table);
+
+static struct i2c_driver ti_sn_bridge_driver = {
+	.driver = {
+		.name = "ti_sn65dsi86",
+		.of_match_table = ti_sn_bridge_match_table,
+		.pm = &ti_sn_bridge_pm_ops,

Quoted 358 lines · Sandeep Panda

Add support for TI's sn65dsi86 dsi2edp bridge chip. The chip converts DSI transmitted signal to eDP signal, which is fed to the connected eDP panel.

This chip can be controlled via either i2c interface or dsi interface. Currently in driver all the control registers are being accessed through i2c interface only. Also as of now HPD support has not been added to bridge chip driver.

Changes in v1:
- Split the dt-bindings and the driver support into separate patches (Andrzej Hajda).
- Use of gpiod APIs to parse and configure gpios instead of obsolete
ones
(Andrzej Hajda).
- Use macros to define the register offsets (Andrzej Hajda).

Changes in v2:
- Separate out edp panel specific HW resource handling from bridge driver and create a separate edp panel drivers to handle panel specific mode information and HW resources (Sean Paul).
- Replace pr_* APIs to DRM_* APIs to log error or debug information (Sean Paul).
- Remove some of the unnecessary structure/variable from driver
(Sean

    Paul).

- Rename the function and structure prefix "sn65dsi86" to
"ti_sn_bridge"
(Sean Paul / Rob Herring).
- Remove most of the hard-coding and modified the bridge init
sequence
based on current mode (Sean Paul).
- Remove the existing function to retrieve the EDID data and implemented this as an i2c_adapter and use drm_get_edid() (Sean
Paul).
- Remove the dummy irq handler implementation, will add back the proper irq handling later (Sean Paul).
- Capture the required enable gpios in a single array based on dt
entry
instead of having individual descriptor for each gpio (Sean Paul).

Changes in v3:
- Remove usage of irq_gpio and replace it as "interrupts" property
(Rob
Herring).
- Remove the unnecessary header file inclusions (Sean Paul).
- Rearrange the header files in alphabetical order (Sean Paul).
- Use regmap interface to perform i2c transactions.
- Update Copyright/License field and address other review comments (Jordan Crouse).

Changes in v4:
- Update License/Copyright (Sean Paul).
- Add Kconfig and Makefile changes (Sean Paul).
- Drop i2c gpio handling from this bridge driver, since i2c sda/scl
gpios
will be handled by i2c master.
- Update required supplies names.
- Remove unnecessary goto statements (Sean Paul).
- Add mutex lock to power_ctrl API to avoid race conditions (Sean

    Paul).

- Add support to parse reference clk frequency from dt(optional).
- Update the bridge chip enable/disable sequence.

Changes in v5:
- Fixed Kbuild test service reported warnings.

Changes in v6:
- Use PM runtime based ref-counting instead of local ref_count
mechanism
(Stephen Boyd).
- Clean up some debug logs and indentations (Sean Paul).
- Simplify dp rate calculation (Sean Paul).
- Add support to configure refclk based on input REFCLK pin or
DACP/N
pin (Stephen Boyd).

Changes in v7:
- Use static supply entries instead of dynamic allocation (Andrzej

    Hajda).
  - Defer bridge driver probe if panel is not probed (Andrzej Hajda).
  - Update of_graph APIs for correct node reference management. 
(Andrzej
    Hajda).

- Remove local display_mode object (Andrzej Hajda).
- Remove version id check function from driver.

Changes in v8:
- Move dsi register/attach function to bridge driver probe (Andrzej

    Hajda).

- Introduce a new helper function to write 16bit words into
consecutive
registers (Andrzej Hajda).
- Remove unnecessary macros (Andrzej Hajda).

Changes in v9:
- Remove dsi register/attach from bridge probe, since dsi dev
register
completion also waits for any panel or bridge to get added. This
creates
deadlock situation when bridge driver calls dsi dev register and attach before bridge add, in its probe function.
- Fix issues faced during testing of bridge driver on actual HW.
- Remove unnecessary initializations (Stephen Boyd).
- Use local refclk lut size instead of global macro (Sean Paul).

Changes in v10:
- Use refclk to determine if continuous dsi clock is needed or not.

Changes in v11:
- Read DPPLL_SRC register to determine continuous clock instead of using refclk handle (Stephen Boyd).

Changes in v12:
- Explain in comment as in why dsi dev registration is done in bridge_attach (Andrzej Hajda).
- Move HPD disable to bridge_pre_enable (Andrzej Hajda).
- Make panel/DDC exclusive until HPD support is added (Andrzej
Hajda).

Changes in v13:
- eDP panels report EDID via DP-AUX channel, so remove support for dedicated DDC line (Andrzej Hajda).

Signed-off-by Sandeep Panda <[email protected]>

---
  drivers/gpu/drm/bridge/Kconfig        |   9 +
  drivers/gpu/drm/bridge/Makefile       |   1 +
  drivers/gpu/drm/bridge/ti-sn65dsi86.c | 676 
++++++++++++++++++++++++++++++++++
  3 files changed, 686 insertions(+)

create mode 100644 drivers/gpu/drm/bridge/ti-sn65dsi86.c

drivers/gpu/drm/bridge/Kconfig +9 -0

index 3b99d5a06c16..8153150acd36 100644
@@ -108,6 +108,15 @@ config DRM_TI_TFP410
  	---help---
  	  Texas Instruments TFP410 DVI/HDMI Transmitter driver
 
+config DRM_TI_SN65DSI86
+	tristate "TI SN65DSI86 DSI to eDP bridge"
+	depends on OF
+	select DRM_KMS_HELPER
+	select REGMAP_I2C
+	select DRM_PANEL
+	---help---
+	  Texas Instruments SN65DSI86 DSI to eDP Bridge driver
+
  source "drivers/gpu/drm/bridge/analogix/Kconfig"
 
  source "drivers/gpu/drm/bridge/adv7511/Kconfig"

drivers/gpu/drm/bridge/Makefile +1 -0

index 373eb28f31ed..a7ca000f6048 100644
@@ -11,5 +11,6 @@ obj-$(CONFIG_DRM_SII9234) += sii9234.o
  obj-$(CONFIG_DRM_TOSHIBA_TC358767) += tc358767.o
  obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix/
  obj-$(CONFIG_DRM_I2C_ADV7511) += adv7511/
+obj-$(CONFIG_DRM_TI_SN65DSI86) += ti-sn65dsi86.o
  obj-$(CONFIG_DRM_TI_TFP410) += ti-tfp410.o
  obj-y += synopsys/

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +93 -0

new file mode 100644
index 000000000000..2f560e3a1460
@@ -0,0 +1,676 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <linux/clk.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/of_graph.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+/* Link Training specific registers */
+#define SN_DEVICE_REV_REG			0x08
+#define SN_HPD_DISABLE_REG			0x5C
+#define SN_DPPLL_SRC_REG			0x0A
+#define SN_DSI_LANES_REG			0x10
+#define SN_DSIA_CLK_FREQ_REG			0x12
+#define SN_ENH_FRAME_REG			0x5A
+#define SN_SSC_CONFIG_REG			0x93
+#define SN_DATARATE_CONFIG_REG			0x94
+#define SN_PLL_ENABLE_REG			0x0D
+#define SN_SCRAMBLE_CONFIG_REG			0x95
+#define SN_AUX_WDATA0_REG			0x64
+#define SN_AUX_ADDR_19_16_REG			0x74
+#define SN_AUX_ADDR_15_8_REG			0x75
+#define SN_AUX_ADDR_7_0_REG			0x76
+#define SN_AUX_LENGTH_REG			0x77
+#define SN_AUX_CMD_REG				0x78
+#define SN_ML_TX_MODE_REG			0x96
+/* video config specific registers */
+#define SN_CHA_ACTIVE_LINE_LENGTH_LOW_REG	0x20
+#define SN_CHA_VERTICAL_DISPLAY_SIZE_LOW_REG	0x24
+#define SN_CHA_HSYNC_PULSE_WIDTH_LOW_REG	0x2C
+#define SN_CHA_HSYNC_PULSE_WIDTH_HIGH_REG	0x2D
+#define SN_CHA_VSYNC_PULSE_WIDTH_LOW_REG	0x30
+#define SN_CHA_VSYNC_PULSE_WIDTH_HIGH_REG	0x31
+#define SN_CHA_HORIZONTAL_BACK_PORCH_REG	0x34
+#define SN_CHA_VERTICAL_BACK_PORCH_REG		0x36
+#define SN_CHA_HORIZONTAL_FRONT_PORCH_REG	0x38
+#define SN_CHA_VERTICAL_FRONT_PORCH_REG		0x3A
+#define SN_DATA_FORMAT_REG			0x5B
+
+#define MIN_DSI_CLK_FREQ_MHZ	40
+
+/* fudge factor required to account for 8b/10b encoding */
+#define DP_CLK_FUDGE_NUM	10
+#define DP_CLK_FUDGE_DEN	8
+
+#define DPPLL_CLK_SRC_REFCLK	0
+#define DPPLL_CLK_SRC_DSICLK	1
+
+#define SN_REFCLK_FREQ_OFFSET	1
+#define SN_DSIA_LANE_OFFSET	3
+#define SN_DP_LANE_OFFSET	4
+#define SN_DP_DATA_RATE_OFFSET	5
+#define SN_SYNC_POLARITY_OFFSET	7
+
+#define SN_ENABLE_VID_STREAM_BIT	BIT(3)
+#define SN_REFCLK_FREQ_BITS		GENMASK(3, 1)
+#define SN_DSIA_NUM_LANES_BITS		GENMASK(4, 3)
+#define SN_DP_NUM_LANES_BITS		GENMASK(5, 4)
+#define SN_DP_DATA_RATE_BITS		GENMASK(7, 5)
+#define SN_HPD_DISABLE_BIT		BIT(0)
+
+#define SN_REGULATOR_SUPPLY_NUM		4
+
+struct ti_sn_bridge {
+	struct device			*dev;
+	struct regmap			*regmap;
+	struct drm_bridge		bridge;
+	struct drm_connector		connector;
+	struct device_node		*host_node;
+	struct mipi_dsi_device		*dsi;
+	struct clk			*refclk;
+	struct drm_panel		*panel;
+	struct gpio_desc		*enable_gpio;
+	struct regulator_bulk_data	supplies[SN_REGULATOR_SUPPLY_NUM];
+};
+
+static const struct regmap_range ti_sn_bridge_volatile_ranges[] = {
+	{ .range_min = 0, .range_max = 0xFF },
+};
+
+static const struct regmap_access_table ti_sn_bridge_volatile_table = 

{

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +24 -0

+	.yes_ranges = ti_sn_bridge_volatile_ranges,
+	.n_yes_ranges = ARRAY_SIZE(ti_sn_bridge_volatile_ranges),
+};
+
+static const struct regmap_config ti_sn_bridge_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.volatile_table = &ti_sn_bridge_volatile_table,
+	.cache_type = REGCACHE_NONE,
+};
+
+static void ti_sn_bridge_write_u16(struct ti_sn_bridge *pdata,
+				   unsigned int reg, u16 val)
+{
+	regmap_write(pdata->regmap, reg, val & 0xFF);
+	regmap_write(pdata->regmap, reg + 1, val >> 8);
+}
+
+static int __maybe_unused ti_sn_bridge_resume(struct device *dev)
+{
+	struct ti_sn_bridge *pdata = dev_get_drvdata(dev);
+	int ret;
+
+	ret = regulator_bulk_enable(SN_REGULATOR_SUPPLY_NUM, 

pdata->supplies);

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +18 -0

+	if (ret) {
+		DRM_ERROR("failed to enable supplies %d\n", ret);
+		return ret;
+	}
+
+	gpiod_set_value(pdata->enable_gpio, 1);
+
+	return ret;
+}
+
+static int __maybe_unused ti_sn_bridge_suspend(struct device *dev)
+{
+	struct ti_sn_bridge *pdata = dev_get_drvdata(dev);
+	int ret;
+
+	gpiod_set_value(pdata->enable_gpio, 0);
+
+	ret = regulator_bulk_disable(SN_REGULATOR_SUPPLY_NUM, 

pdata->supplies);

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +18 -0

+	if (ret)
+		DRM_ERROR("failed to disable supplies %d\n", ret);
+
+	return ret;
+}
+
+static const struct dev_pm_ops ti_sn_bridge_pm_ops = {
+	SET_RUNTIME_PM_OPS(ti_sn_bridge_suspend, ti_sn_bridge_resume, NULL)
+};
+
+/* Connector funcs */
+static struct ti_sn_bridge *
+connector_to_ti_sn_bridge(struct drm_connector *connector)
+{
+	return container_of(connector, struct ti_sn_bridge, connector);
+}
+
+static int ti_sn_bridge_connector_get_modes(struct drm_connector 

*connector)

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +18 -0

+{
+	struct ti_sn_bridge *pdata = connector_to_ti_sn_bridge(connector);
+
+	return drm_panel_get_modes(pdata->panel);
+}
+
+static enum drm_mode_status
+ti_sn_bridge_connector_mode_valid(struct drm_connector *connector,
+			     struct drm_display_mode *mode)
+{
+	/* maximum supported resolution is 4K at 60 fps */
+	if (mode->clock > 594000)
+		return MODE_CLOCK_HIGH;
+
+	return MODE_OK;
+}
+
+static struct drm_connector_helper_funcs 

ti_sn_bridge_connector_helper_funcs = {

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +6 -0

+	.get_modes = ti_sn_bridge_connector_get_modes,
+	.mode_valid = ti_sn_bridge_connector_mode_valid,
+};
+
+static enum drm_connector_status
+ti_sn_bridge_connector_detect(struct drm_connector *connector, bool 

force)

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +4 -0

+{
+	struct ti_sn_bridge *pdata = connector_to_ti_sn_bridge(connector);
+
+	/**

drivers/gpu/drm/bridge/ti-sn65dsi86.c line 186

Quoted 5 lines

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +5 -0

+	 * TODO: Currently if drm_panel is present, then always
+	 * return the status as connected. Need to add support to detect
+	 * device state for no panel(hot pluggable) scenarios.
+	 */
+	if (pdata->panel)

Since pdata->panel is always non-zero after successful probe, you can remove all such checks.

Quoted 460 lines

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +6 -0

+		return connector_status_connected;
+	else
+		return connector_status_unknown;
+}
+
+static const struct drm_connector_funcs ti_sn_bridge_connector_funcs 

= {

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +5 -0

+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.detect = ti_sn_bridge_connector_detect,
+	.destroy = drm_connector_cleanup,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = 

drm_atomic_helper_connector_duplicate_state,

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +4 -0

+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static struct ti_sn_bridge *bridge_to_ti_sn_bridge(struct drm_bridge 

*bridge)

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +40 -0

+{
+	return container_of(bridge, struct ti_sn_bridge, bridge);
+}
+
+static int ti_sn_bridge_parse_regulators(struct ti_sn_bridge *pdata)
+{
+	unsigned int i;
+	const char * const ti_sn_bridge_supply_names[] = {
+		"vcca", "vcc", "vccio", "vpll",
+	};
+
+	for (i = 0; i < SN_REGULATOR_SUPPLY_NUM; i++)
+		pdata->supplies[i].supply = ti_sn_bridge_supply_names[i];
+
+	return devm_regulator_bulk_get(pdata->dev, SN_REGULATOR_SUPPLY_NUM,
+				       pdata->supplies);
+}
+
+static int ti_sn_bridge_attach(struct drm_bridge *bridge)
+{
+	int ret, val;
+	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+	struct mipi_dsi_host *host;
+	struct mipi_dsi_device *dsi;
+	const struct mipi_dsi_device_info info = { .type = "ti_sn_bridge",
+						   .channel = 0,
+						   .node = NULL,
+						 };
+
+	ret = drm_connector_init(bridge->dev, &pdata->connector,
+				 &ti_sn_bridge_connector_funcs,
+				 DRM_MODE_CONNECTOR_eDP);
+	if (ret) {
+		DRM_ERROR("Failed to initialize connector with drm\n");
+		return ret;
+	}
+
+	drm_connector_helper_add(&pdata->connector,
+				 &ti_sn_bridge_connector_helper_funcs);
+	drm_mode_connector_attach_encoder(&pdata->connector, 

bridge->encoder);

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +3 -0

+
+	/*
+	 * TODO: ideally finding host resource and dsi dev registration 

needs

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +1 -0

+	 * to be done in bridge probe. But some existing DSI host drivers 

will

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +1 -0

+	 * wait for any of the drm_bridge/drm_panel to get added to the 

global

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +3 -0

+	 * bridge/panel list, before completing their probe. So if we do the
+	 * dsi dev registration part in bridge probe, before populating in
+	 * the global bridge list, then it will cause deadlock as dsi host 

probe

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +2 -0

+	 * will never complete, neither our bridge probe. So keeping it here
+	 * will satisfy most of the existing host drivers. Once the host 

driver

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +20 -0

+	 * is fixed we can move the below code to bridge probe safely.
+	 */
+	host = of_find_mipi_dsi_host_by_node(pdata->host_node);
+	if (!host) {
+		DRM_ERROR("failed to find dsi host\n");
+		ret = -ENODEV;
+		goto err_dsi_host;
+	}
+
+	dsi = mipi_dsi_device_register_full(host, &info);
+	if (IS_ERR(dsi)) {
+		DRM_ERROR("failed to create dsi device\n");
+		ret = PTR_ERR(dsi);
+		goto err_dsi_host;
+	}
+
+	/* TODO: setting to 4 lanes always for now */
+	dsi->lanes = 4;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | 

MIPI_DSI_MODE_VIDEO_SYNC_PULSE |

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +62 -0

+			  MIPI_DSI_MODE_EOT_PACKET | MIPI_DSI_MODE_VIDEO_HSE;
+
+	/* check if continuous dsi clock is required or not */
+	pm_runtime_get_sync(pdata->dev);
+	regmap_read(pdata->regmap, SN_DPPLL_SRC_REG, &val);
+	pm_runtime_put(pdata->dev);
+	if (!(val & DPPLL_CLK_SRC_DSICLK))
+		dsi->mode_flags |= MIPI_DSI_CLOCK_NON_CONTINUOUS;
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		DRM_ERROR("failed to attach dsi to host\n");
+		goto err_dsi_attach;
+	}
+	pdata->dsi = dsi;
+
+	/* attach panel to bridge */
+	if (pdata->panel)
+		drm_panel_attach(pdata->panel, &pdata->connector);
+
+	return 0;
+
+err_dsi_attach:
+	mipi_dsi_device_unregister(dsi);
+err_dsi_host:
+	drm_connector_cleanup(&pdata->connector);
+	return ret;
+}
+
+static void ti_sn_bridge_disable(struct drm_bridge *bridge)
+{
+	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+
+	if (pdata->panel)
+		drm_panel_disable(pdata->panel);
+
+	/* disable video stream */
+	regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG,
+			   SN_ENABLE_VID_STREAM_BIT, 0);
+	/* semi auto link training mode OFF */
+	regmap_write(pdata->regmap, SN_ML_TX_MODE_REG, 0);
+	/* disable DP PLL */
+	regmap_write(pdata->regmap, SN_PLL_ENABLE_REG, 0);
+
+	if (pdata->panel)
+		drm_panel_unprepare(pdata->panel);
+}
+
+static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn_bridge *pdata)
+{
+	u32 bit_rate_khz, clk_freq_khz;
+	struct drm_display_mode *mode =
+		&pdata->bridge.encoder->crtc->state->adjusted_mode;
+
+	bit_rate_khz = mode->clock *
+			mipi_dsi_pixel_format_to_bpp(pdata->dsi->format);
+	clk_freq_khz = bit_rate_khz / (pdata->dsi->lanes * 2);
+
+	return clk_freq_khz;
+}
+
+/* clk frequencies supported by bridge in Hz in case derived from 

REFCLK pin */

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +9 -0

+static const u32 ti_sn_bridge_refclk_lut[] = {
+	12000000,
+	19200000,
+	26000000,
+	27000000,
+	38400000,
+};
+
+/* clk frequencies supported by bridge in Hz in case derived from 

DACP/N pin */

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +63 -0

+static const u32 ti_sn_bridge_dsiclk_lut[] = {
+	468000000,
+	384000000,
+	416000000,
+	486000000,
+	460800000,
+};
+
+static void ti_sn_bridge_set_refclk_freq(struct ti_sn_bridge *pdata)
+{
+	int i;
+	u32 refclk_rate;
+	const u32 *refclk_lut;
+	size_t refclk_lut_size;
+
+	if (pdata->refclk) {
+		refclk_rate = clk_get_rate(pdata->refclk);
+		refclk_lut = ti_sn_bridge_refclk_lut;
+		refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_refclk_lut);
+		clk_prepare_enable(pdata->refclk);
+	} else {
+		refclk_rate = ti_sn_bridge_get_dsi_freq(pdata) * 1000;
+		refclk_lut = ti_sn_bridge_dsiclk_lut;
+		refclk_lut_size = ARRAY_SIZE(ti_sn_bridge_dsiclk_lut);
+	}
+
+	/* for i equals to refclk_lut_size means default frequency */
+	for (i = 0; i < refclk_lut_size; i++)
+		if (refclk_lut[i] == refclk_rate)
+			break;
+
+	regmap_update_bits(pdata->regmap, SN_DPPLL_SRC_REG,
+			   SN_REFCLK_FREQ_BITS, i << SN_REFCLK_FREQ_OFFSET);
+}
+
+/**
+ * LUT index corresponds to register value and
+ * LUT values corresponds to dp data rate supported
+ * by the bridge in Mbps unit.
+ */
+static const unsigned int ti_sn_bridge_dp_rate_lut[] = {
+	0, 1620, 2160, 2430, 2700, 3240, 4320, 5400
+};
+
+static void ti_sn_bridge_set_dsi_dp_rate(struct ti_sn_bridge *pdata)
+{
+	unsigned int bit_rate_mhz, clk_freq_mhz, dp_rate_mhz;
+	unsigned int val, i;
+	struct drm_display_mode *mode =
+		&pdata->bridge.encoder->crtc->state->adjusted_mode;
+
+	/* set DSIA clk frequency */
+	bit_rate_mhz = (mode->clock / 1000) *
+			mipi_dsi_pixel_format_to_bpp(pdata->dsi->format);
+	clk_freq_mhz = bit_rate_mhz / (pdata->dsi->lanes * 2);
+
+	/* for each increment in val, frequency increases by 5MHz */
+	val = (MIN_DSI_CLK_FREQ_MHZ / 5) +
+		(((clk_freq_mhz - MIN_DSI_CLK_FREQ_MHZ) / 5) & 0xFF);
+	regmap_write(pdata->regmap, SN_DSIA_CLK_FREQ_REG, val);
+
+	/* set DP data rate */
+	dp_rate_mhz = ((bit_rate_mhz / pdata->dsi->lanes) * 

DP_CLK_FUDGE_NUM) /

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +10 -0

+							DP_CLK_FUDGE_DEN;
+	for (i = 0; i < ARRAY_SIZE(ti_sn_bridge_dp_rate_lut) - 1; i++)
+		if (ti_sn_bridge_dp_rate_lut[i] > dp_rate_mhz)
+			break;
+
+	regmap_update_bits(pdata->regmap, SN_DATARATE_CONFIG_REG,
+			   SN_DP_DATA_RATE_BITS, i << SN_DP_DATA_RATE_OFFSET);
+}
+
+static void ti_sn_bridge_set_video_timings(struct ti_sn_bridge 

*pdata)

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +65 -0

+{
+	struct drm_display_mode *mode =
+		&pdata->bridge.encoder->crtc->state->adjusted_mode;
+	u8 hsync_polarity = 0, vsync_polarity = 0;
+
+	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
+		hsync_polarity = BIT(SN_SYNC_POLARITY_OFFSET);
+	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
+		vsync_polarity = BIT(SN_SYNC_POLARITY_OFFSET);
+
+	ti_sn_bridge_write_u16(pdata, SN_CHA_ACTIVE_LINE_LENGTH_LOW_REG,
+			       mode->hdisplay);
+	ti_sn_bridge_write_u16(pdata, SN_CHA_VERTICAL_DISPLAY_SIZE_LOW_REG,
+			       mode->vdisplay);
+	regmap_write(pdata->regmap, SN_CHA_HSYNC_PULSE_WIDTH_LOW_REG,
+		     (mode->hsync_end - mode->hsync_start) & 0xFF);
+	regmap_write(pdata->regmap, SN_CHA_HSYNC_PULSE_WIDTH_HIGH_REG,
+		     (((mode->hsync_end - mode->hsync_start) >> 8) & 0x7F) |
+		     hsync_polarity);
+	regmap_write(pdata->regmap, SN_CHA_VSYNC_PULSE_WIDTH_LOW_REG,
+		     (mode->vsync_end - mode->vsync_start) & 0xFF);
+	regmap_write(pdata->regmap, SN_CHA_VSYNC_PULSE_WIDTH_HIGH_REG,
+		    (((mode->vsync_end - mode->vsync_start) >> 8) & 0x7F) |
+		    vsync_polarity);
+
+	regmap_write(pdata->regmap, SN_CHA_HORIZONTAL_BACK_PORCH_REG,
+		     (mode->htotal - mode->hsync_end) & 0xFF);
+	regmap_write(pdata->regmap, SN_CHA_VERTICAL_BACK_PORCH_REG,
+		     (mode->vtotal - mode->vsync_end) & 0xFF);
+
+	regmap_write(pdata->regmap, SN_CHA_HORIZONTAL_FRONT_PORCH_REG,
+		     (mode->hsync_start - mode->hdisplay) & 0xFF);
+	regmap_write(pdata->regmap, SN_CHA_VERTICAL_FRONT_PORCH_REG,
+		     (mode->vsync_start - mode->vdisplay) & 0xFF);
+
+	usleep_range(10000, 10500); /* 10ms delay recommended by spec */
+}
+
+static void ti_sn_bridge_enable(struct drm_bridge *bridge)
+{
+	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+	unsigned int val;
+
+	if (pdata->panel)
+		drm_panel_prepare(pdata->panel);
+
+	/* DSI_A lane config */
+	val = (4 - pdata->dsi->lanes) << SN_DSIA_LANE_OFFSET;
+	regmap_update_bits(pdata->regmap, SN_DSI_LANES_REG,
+			   SN_DSIA_NUM_LANES_BITS, val);
+
+	/* DP lane config */
+	val = (pdata->dsi->lanes - 1) << SN_DP_LANE_OFFSET;
+	regmap_update_bits(pdata->regmap, SN_SSC_CONFIG_REG,
+			   SN_DP_NUM_LANES_BITS, val);
+
+	/* set dsi/dp clk frequency value */
+	ti_sn_bridge_set_dsi_dp_rate(pdata);
+
+	/* enable DP PLL */
+	regmap_write(pdata->regmap, SN_PLL_ENABLE_REG, 1);
+	usleep_range(10000, 10500); /* 10ms delay recommended by spec */
+
+	/**
+	 * The SN65DSI86 only supports ASSR Display Authentication method 

and

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +2 -0

+	 * this method is enabled by default. An eDP panel must support this
+	 * authentication method. We need to enable this method in the eDP 

panel

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +148 -0

+	 * at DisplayPort address 0x0010A prior to link training.
+	 */
+	regmap_write(pdata->regmap, SN_AUX_WDATA0_REG, 0x01);
+	regmap_write(pdata->regmap, SN_AUX_ADDR_19_16_REG, 0x00);
+	regmap_write(pdata->regmap, SN_AUX_ADDR_15_8_REG, 0x01);
+	regmap_write(pdata->regmap, SN_AUX_ADDR_7_0_REG, 0x0A);
+	regmap_write(pdata->regmap, SN_AUX_LENGTH_REG, 0x01);
+	regmap_write(pdata->regmap, SN_AUX_CMD_REG, 0x81);
+	usleep_range(10000, 10500); /* 10ms delay recommended by spec */
+
+	/* Semi auto link training mode */
+	regmap_write(pdata->regmap, SN_ML_TX_MODE_REG, 0x0A);
+	msleep(20); /* 20ms delay recommended by spec */
+
+	/* config video parameters */
+	ti_sn_bridge_set_video_timings(pdata);
+
+	/* enable video stream */
+	regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG,
+			   SN_ENABLE_VID_STREAM_BIT, SN_ENABLE_VID_STREAM_BIT);
+
+	if (pdata->panel)
+		drm_panel_enable(pdata->panel);
+}
+
+static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge)
+{
+	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+
+	pm_runtime_get_sync(pdata->dev);
+
+	/* configure bridge ref_clk */
+	ti_sn_bridge_set_refclk_freq(pdata);
+
+	/* in case drm_panel is connected then HPD is not supported */
+	if (pdata->panel)
+		regmap_update_bits(pdata->regmap, SN_HPD_DISABLE_REG,
+				   SN_HPD_DISABLE_BIT, SN_HPD_DISABLE_BIT);
+}
+
+static void ti_sn_bridge_post_disable(struct drm_bridge *bridge)
+{
+	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+
+	if (pdata->refclk)
+		clk_disable_unprepare(pdata->refclk);
+
+	pm_runtime_put_sync(pdata->dev);
+}
+
+static const struct drm_bridge_funcs ti_sn_bridge_funcs = {
+	.attach = ti_sn_bridge_attach,
+	.pre_enable = ti_sn_bridge_pre_enable,
+	.enable = ti_sn_bridge_enable,
+	.disable = ti_sn_bridge_disable,
+	.post_disable = ti_sn_bridge_post_disable,
+};
+
+static int ti_sn_bridge_parse_dsi_host(struct ti_sn_bridge *pdata)
+{
+	struct device_node *np = pdata->dev->of_node;
+
+	pdata->host_node = of_graph_get_remote_node(np, 0, 0);
+
+	if (!pdata->host_node) {
+		DRM_ERROR("remote dsi host node not found\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
+static int ti_sn_bridge_probe(struct i2c_client *client,
+	 const struct i2c_device_id *id)
+{
+	struct ti_sn_bridge *pdata;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		DRM_ERROR("device doesn't support I2C\n");
+		return -ENODEV;
+	}
+
+	pdata = devm_kzalloc(&client->dev, sizeof(struct ti_sn_bridge),
+			     GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	pdata->regmap = devm_regmap_init_i2c(client,
+					     &ti_sn_bridge_regmap_config);
+	if (IS_ERR(pdata->regmap)) {
+		DRM_ERROR("regmap i2c init failed\n");
+		return PTR_ERR(pdata->regmap);
+	}
+
+	pdata->dev = &client->dev;
+
+	ret = drm_of_find_panel_or_bridge(pdata->dev->of_node, 1, 0,
+					  &pdata->panel, NULL);
+	if (ret) {
+		DRM_ERROR("could not find any panel node\n");
+		return ret;
+	}
+
+	dev_set_drvdata(&client->dev, pdata);
+
+	pdata->enable_gpio = devm_gpiod_get(pdata->dev, "enable",
+					    GPIOD_OUT_LOW);
+	if (IS_ERR(pdata->enable_gpio)) {
+		DRM_ERROR("failed to get enable gpio from DT\n");
+		ret = PTR_ERR(pdata->enable_gpio);
+		return ret;
+	}
+
+	ret = ti_sn_bridge_parse_regulators(pdata);
+	if (ret) {
+		DRM_ERROR("failed to parse regulators\n");
+		return ret;
+	}
+
+	pdata->refclk = devm_clk_get(pdata->dev, "refclk");
+	if (IS_ERR(pdata->refclk)) {
+		ret = PTR_ERR(pdata->refclk);
+		if (ret == -EPROBE_DEFER)
+			return ret;
+		DRM_DEBUG_KMS("refclk not found\n");
+		pdata->refclk = NULL;
+	}
+
+	ret = ti_sn_bridge_parse_dsi_host(pdata);
+	if (ret)
+		return ret;
+
+	pm_runtime_enable(pdata->dev);
+
+	i2c_set_clientdata(client, pdata);
+
+	pdata->bridge.funcs = &ti_sn_bridge_funcs;
+	pdata->bridge.of_node = client->dev.of_node;
+
+	drm_bridge_add(&pdata->bridge);
+
+	return 0;
+}
+
+static int ti_sn_bridge_remove(struct i2c_client *client)
+{
+	struct ti_sn_bridge *pdata = i2c_get_clientdata(client);

drivers/gpu/drm/bridge/ti-sn65dsi86.c line 636

Quoted 6 lines

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +6 -0

+
+	if (!pdata)
+		return -EINVAL;
+
+	if (pdata->host_node)
+		of_node_put(pdata->host_node);

It is always true.

drivers/gpu/drm/bridge/ti-sn65dsi86.c line 640

Quoted 5 lines

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +4 -0

+
+	pm_runtime_disable(pdata->dev);
+
+	if (pdata->dsi) {

It is always true.

Beside these checks it looks OK.

Regards
Andrzej

Quoted 28 lines

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +28 -0

+		mipi_dsi_detach(pdata->dsi);
+		mipi_dsi_device_unregister(pdata->dsi);
+	}
+
+	drm_bridge_remove(&pdata->bridge);
+
+	return 0;
+}
+
+static struct i2c_device_id ti_sn_bridge_id[] = {
+	{ "ti,sn65dsi86", 0},
+	{},
+};
+MODULE_DEVICE_TABLE(i2c, ti_sn_bridge_id);
+
+static const struct of_device_id ti_sn_bridge_match_table[] = {
+	{.compatible = "ti,sn65dsi86"},
+	{},
+};
+MODULE_DEVICE_TABLE(of, ti_sn_bridge_match_table);
+
+static struct i2c_driver ti_sn_bridge_driver = {
+	.driver = {
+		.name = "ti_sn65dsi86",
+		.of_match_table = ti_sn_bridge_match_table,
+		.pm = &ti_sn_bridge_pm_ops,
+	},
+	.probe = ti_sn_bridge_probe,

drivers/gpu/drm/bridge/ti-sn65dsi86.c line 676

Quoted 8 lines

drivers/gpu/drm/bridge/ti-sn65dsi86.c new file +8 -0

+	.remove = ti_sn_bridge_remove,
+	.id_table = ti_sn_bridge_id,
+};
+module_i2c_driver(ti_sn_bridge_driver);
+
+MODULE_AUTHOR("Sandeep Panda <[email protected]>");
+MODULE_DESCRIPTION("sn65dsi86 DSI to eDP bridge driver");
+MODULE_LICENSE("GPL v2");

Document the bindings used for the sn65dsi86 DSI to eDP bridge.

Changes in v1:
- Rephrase the dt-binding descriptions to be more inline with existing bindings (Andrzej Hajda).
- Add missing dt-binding that are parsed by corresponding driver (Andrzej Hajda).

Changes in v2:
- Remove edp panel specific dt-binding entries. Only keep bridge
specific entries (Sean Paul).
- Remove custom-modes dt entry since its usage is removed from driver also (Sean Paul).
- Remove is-pluggable dt entry since this will not be needed anymore (Sean Paul).

Changes in v3:
- Remove irq-gpio dt entry and instead populate is an interrupt property (Rob Herring).

Changes in v4:
- Add link to bridge chip datasheet (Stephen Boyd)
- Add vpll and vcc regulator supply bindings (Stephen Boyd)
- Add ref clk optional dt binding (Stephen Boyd)
- Add gpio-controller optional dt binding (Stephen Boyd)

Changes in v5:
- Use clock property to specify the input refclk (Stephen Boyd).
- Update gpio cell and pwm cell numbers (Stephen Boyd).

Changes in v6:
- Add property to mention the lane mapping scheme and polarity inversion (Stephen Boyd).

Changes in v7:
- Detail description of lane mapping scheme dt property (Andrzej Hajda/ Rob Herring).
- Removed HDP gpio binding, since the bridge uses IRQ signal to determine HPD, and IRQ property is already documented in binding.

Changes in v8:
- Removed unnecessary explanation of lane mapping and polarity dt property, since these are already explained in media/video-interface dt binidng (Rob Herring).

Changes in v9:
- Avoid putting re-definition of lane mapping and polarity dt binding (Rob Herring).

Changes in v10:
- Use interrupts-extended property instead of interrupts to specify interrupt line (Andrzej Hajda).
- Move data-lanes and lane-polarity property example to proper place (Andrzej Hajda).

Changes in v11:
- Add a property for suspend gpio function of GPIO1 pin on bridge chip (Stephen Boyd).

Changes in v12:
- Remove binding for dedicated DDC line (Andrzej Hajda).

Signed-off-by Sandeep Panda <[email protected]>

---
 .../bindings/display/bridge/ti,sn65dsi86.txt       | 87 ++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/ti,sn65dsi86.txt

Document the bindings used for the sn65dsi86 DSI to eDP bridge.

Changes in v1:
- Rephrase the dt-binding descriptions to be more inline with existing bindings (Andrzej Hajda).
- Add missing dt-binding that are parsed by corresponding driver (Andrzej Hajda).

Changes in v2:
- Remove edp panel specific dt-binding entries. Only keep bridge
specific entries (Sean Paul).
- Remove custom-modes dt entry since its usage is removed from driver also (Sean Paul).
- Remove is-pluggable dt entry since this will not be needed anymore (Sean Paul).

Changes in v3:
- Remove irq-gpio dt entry and instead populate is an interrupt property (Rob Herring).

Changes in v4:
- Add link to bridge chip datasheet (Stephen Boyd)
- Add vpll and vcc regulator supply bindings (Stephen Boyd)
- Add ref clk optional dt binding (Stephen Boyd)
- Add gpio-controller optional dt binding (Stephen Boyd)

Changes in v5:
- Use clock property to specify the input refclk (Stephen Boyd).
- Update gpio cell and pwm cell numbers (Stephen Boyd).

Changes in v6:
- Add property to mention the lane mapping scheme and polarity inversion (Stephen Boyd).

Changes in v7:
- Detail description of lane mapping scheme dt property (Andrzej Hajda/ Rob Herring).
- Removed HDP gpio binding, since the bridge uses IRQ signal to determine HPD, and IRQ property is already documented in binding.

Changes in v8:
- Removed unnecessary explanation of lane mapping and polarity dt property, since these are already explained in media/video-interface dt binidng (Rob Herring).

Changes in v9:
- Avoid putting re-definition of lane mapping and polarity dt binding (Rob Herring).

Changes in v10:
- Use interrupts-extended property instead of interrupts to specify interrupt line (Andrzej Hajda).
- Move data-lanes and lane-polarity property example to proper place (Andrzej Hajda).

Changes in v11:
- Add a property for suspend gpio function of GPIO1 pin on bridge chip (Stephen Boyd).

Changes in v12:
- Remove binding for dedicated DDC line (Andrzej Hajda).

Signed-off-by Sandeep Panda <[email protected]>

---