drm: bridge: Add NWL MIPI DSI host controller support

This adds initial support for the NWL MIPI DSI Host controller found on i.MX8 SoCs.

It adds support for the i.MX8MQ but the same IP core can also be found on e.g. i.MX8QXP. I added the necessary hooks to support other imx8 variants but since I only have imx8mq boards to test I omitted the platform data for other SoCs.

The code is based on NXPs BSP so I added Robert Chiras as Co-authored-by.

The most notable changes over the BSP driver are
- Calculate HS mode timing from phy_configure_opts_mipi_dphy
- Perform all clock setup via DT
- Merge nwl-imx and nwl drivers
- Add B0 silion revision quirk
- become a bridge driver to hook into mxsfb (from what I read[0] DCSS, which also can drive the nwl on the imx8mq will likely not become part of imx-display-subsystem so it makes sense to make it drive a bridge for dsi as well).
- Use panel_bridge to attach the panel
- Use multiplex framework instead of accessing syscon directly

This has been tested on a Librem 5 devkit using mxsfb with Robert's patches[1] and the rocktech-jh057n00900 panel driver on next-20190807. The DCSS can later on also act as input source too.

Changes from v3:
- Per review comments by Robert Chiras
https://lists.freedesktop.org/archives/dri-devel/2019-August/232580.html
- Add Robert's {Signed-off,Tested}-by:
- Respect number of lanes when calculting bandwidth limits
- Drop duplicate NWL_DSI_ENABLE_MULT_PKTS setup
- Per testing by Rober Chiras
https://lists.freedesktop.org/archives/dri-devel/2019-August/233688.html
- Drop duplicate (and too early) drm_bridge_add() in nwl_dir_probe() that made mxsfb fail to connect to the bridge since the panel_bridge was not up yet. drm_bridge_add() happens in nwl_dsi_host_attach() after the panel_bridge was set up.
- Per review comments by Rob Herring on bindings
https://lists.freedesktop.org/archives/dri-devel/2019-August/233196.html
- drop description from power-domains and resets
- allow BSD 2 clause license as well
- make ports more specific
- add #address-cells, #size-cells as required
- use additionalProperties
- panel is of type object

Changes from v2:
- Per review comments by Rob Herring
https://lists.freedesktop.org/archives/dri-devel/2019-August/230448.html
- bindings:
- Simplify by restricting to fsl,imx8mq-nwl-dsi
- document reset lines
- add port@{0,1}
- use a real compatible string for the panel
- resets are required
- Per review comments by Arnd Bergmann
https://lists.freedesktop.org/archives/dri-devel/2019-August/230868.html
- Don't access iomuxc_gpr regs directly. This allows us to drop the first patch in the series with the iomuxc_gpr field defines.
- Per review comments by Laurent Pinchart
Fix wording in bindings
- Add mux-controls to bindings
- Don't print error message on dphy probe deferral

Changes from v1:
- Per review comments by Sam Ravnborg
https://lists.freedesktop.org/archives/dri-devel/2019-July/228130.html
- Change binding docs to YAML
- build: Don't always visit imx-nwl/
- build: Add header-test-y
- Sort headers according to DRM convention
- Use drm_display_mode instead of videmode
- Per review comments by Fabio Estevam
https://lists.freedesktop.org/archives/dri-devel/2019-July/228299.html
- Don't restrict build to ARCH_MXC
- Drop unused includes
- Drop unreachable code in imx_nwl_dsi_bridge_mode_fixup()
- Drop remaining calls of dev_err() and use DRM_DEV_ERR() consistently.
- Use devm_platform_ioremap_resource()
- Drop devm_free_irq() in probe() error path
- Use single line comments where sufficient
- Use <linux/time64.h> instead of defining USEC_PER_SEC
- Make input source select imx8 specific
- Drop <asm/unaligned.h> inclusion (after removal of get_unaligned_le32)
- Drop all EXPORT_SYMBOL_GPL() for functions used in the same module but different source files.
- Drop nwl_dsi_enable_{rx,tx}_clock() by invoking clk_prepare_enable() directly
- Remove pointless comment
- Laurent Pinchart
https://lists.freedesktop.org/archives/dri-devel/2019-July/228313.html
https://lists.freedesktop.org/archives/dri-devel/2019-July/228308.html
- Drop (on iMX8MQ) unused csr regmap
- Use NWL_MAX_PLATFORM_CLOCKS everywhere
- Drop get_unaligned_le32() usage
- remove duplicate 'for the' in binding docs
- Don't include unused <linux/clk-provider.h>
- Don't include unused <linux/component.h>
- Drop dpms_mode for tracking state, trust the drm layer on that
- Use pm_runtime_put() instead of pm_runtime_put_sync()
- Don't overwrite encoder type
- Make imx_nwl_platform_data const
- Use the reset controller API instead of open coding that platform specific part
- Use <linux/bitfield.h> intead of making up our own defines
- name mipi_dsi_transfer less generic: nwl_dsi_transfer
- ensure clean in .remove by calling mipi_dsi_host_unregister.
- prefix constants by NWL_DSI_
- properly format transfer_direction enum
- simplify platform clock handling
- Don't modify state in mode_fixup() and use mode_set() instead
- Drop bridge detach(), already handle by nwl_dsi_host_detach()
- Drop USE_*_QUIRK() macros
- Drop (for now) unused clock defnitions. 'pixel' and 'bypass' clock will be used for i.MX8 SoCs but since they're unused atm drop the definitions - but keep the logic to enable/disable several clocks in place since we know we'll need it in the future.

Changes from v0:
- Add quirk for IMQ8MQ silicon B0 revision to not mess with the system reset controller on power down since enable() won't work otherwise.
- Drop devm_free_irq() handled by the device driver core
- Disable tx esc clock after the phy power down to unbreak disable/enable (unblank/blank)
- Add ports to dt binding docs
- Select GENERIC_PHY_MIPI_DPHY instead of GENERIC_PHY for phy_mipi_dphy_get_default_config
- Select DRM_MIPI_DSI
- Include drm_print.h to fix build on next-20190408
- Drop some debugging messages
- Newline terminate all DRM_ printouts
- Turn component driver into a drm bridge

[0]: https://lists.freedesktop.org/archives/dri-devel/2019-May/219484.html
[1]: https://patchwork.freedesktop.org/series/62822/

Guido Günther (2):
dt-bindings: display/bridge: Add binding for NWL mipi dsi host
controller
drm/bridge: Add NWL MIPI DSI host controller support

 .../bindings/display/bridge/nwl-dsi.yaml      | 176 +++++
 drivers/gpu/drm/bridge/Kconfig                |   2 +
 drivers/gpu/drm/bridge/Makefile               |   1 +
 drivers/gpu/drm/bridge/nwl-dsi/Kconfig        |  16 +
 drivers/gpu/drm/bridge/nwl-dsi/Makefile       |   4 +
 drivers/gpu/drm/bridge/nwl-dsi/nwl-drv.c      | 499 +++++++++++++
 drivers/gpu/drm/bridge/nwl-dsi/nwl-drv.h      |  65 ++
 drivers/gpu/drm/bridge/nwl-dsi/nwl-dsi.c      | 699 ++++++++++++++++++
 drivers/gpu/drm/bridge/nwl-dsi/nwl-dsi.h      | 112 +++
 9 files changed, 1574 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/nwl-dsi.yaml
 create mode 100644 drivers/gpu/drm/bridge/nwl-dsi/Kconfig
 create mode 100644 drivers/gpu/drm/bridge/nwl-dsi/Makefile
 create mode 100644 drivers/gpu/drm/bridge/nwl-dsi/nwl-drv.c
 create mode 100644 drivers/gpu/drm/bridge/nwl-dsi/nwl-drv.h
 create mode 100644 drivers/gpu/drm/bridge/nwl-dsi/nwl-dsi.c
 create mode 100644 drivers/gpu/drm/bridge/nwl-dsi/nwl-dsi.h

2.23.0.rc1

The Northwest Logic MIPI DSI IP core can be found in NXPs i.MX8 SoCs.

---
 .../bindings/display/bridge/nwl-dsi.yaml      | 176 ++++++++++++++++++
 1 file changed, 176 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/nwl-dsi.yaml

new file mode 100644
index 000000000000..31119c7885ff
@@ -0,0 +1,176 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/nwl-dsi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Northwest Logic MIPI-DSI controller on i.MX SoCs
+
+maintainers:
+  - Guido Gúnther <[email protected]>
+  - Robert Chiras <[email protected]>
+
+description: |
+  NWL MIPI-DSI host controller found on i.MX8 platforms. This is a dsi bridge for
+  the SOCs NWL MIPI-DSI host controller.
+
+properties:
+  compatible:
+    const: fsl,imx8mq-nwl-dsi
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  clocks:
+    items:
+      - description: DSI core clock
+      - description: RX_ESC clock (used in escape mode)
+      - description: TX_ESC clock (used in escape mode)
+      - description: PHY_REF clock
+
+  clock-names:
+    items:
+      - const: core
+      - const: rx_esc
+      - const: tx_esc
+      - const: phy_ref
+
+  mux-controls:
+    description:
+      mux controller node to use for operating the input mux
+
+  phys:
+    maxItems: 1
+    description:
+      A phandle to the phy module representing the DPHY
+
+  phy-names:
+    items:
+      - const: dphy
+
+  power-domains:
+    maxItems: 1
+
+  resets:
+    items:
+      - description: dsi byte reset line
+      - description: dsi dpi reset line
+      - description: dsi esc reset line
+      - description: dsi pclk reset line
+
+  reset-names:
+    items:
+      - const: byte
+      - const: dpi
+      - const: esc
+      - const: pclk
+
+  ports:
+    type: object
+    description:
+      A node containing DSI input & output port nodes with endpoint
+      definitions as documented in
+      Documentation/devicetree/bindings/graph.txt.
+    properties:
+      port@0:
+        type: object
+        description:
+          Input port node to receive pixel data from the
+          display controller
+
+      port@1:
+        type: object
+        description:
+          DSI output port node to the panel or the next bridge
+          in the chain
+
+      '#address-cells':
+        const: 1
+
+      '#size-cells':
+        const: 0
+
+    required:
+      - '#address-cells'
+      - '#size-cells'
+      - port@0
+      - port@1
+
+    additionalProperties: false
+
+patternProperties:
+  "^panel@[0-9]+$":
+    type: object
+
+required:
+  - '#address-cells'
+  - '#size-cells'
+  - clock-names
+  - clocks
+  - compatible
+  - interrupts
+  - mux-controls
+  - phy-names
+  - phys
+  - ports
+  - reg
+  - reset-names
+  - resets
+
+additionalProperties: false
+
+examples:
+ - |
+
+   mipi_dsi: mipi_dsi@30a00000 {
+              #address-cells = <1>;
+              #size-cells = <0>;
+              compatible = "fsl,imx8mq-nwl-dsi";
+              reg = <0x30A00000 0x300>;
+              clocks = <&clk 163>, <&clk 244>, <&clk 245>, <&clk 164>;
+              clock-names = "core", "rx_esc", "tx_esc", "phy_ref";
+              interrupts = <0 34 4>;
+              mux-controls = <&mux 0>;
+              power-domains = <&pgc_mipi>;
+              resets = <&src 0>, <&src 1>, <&src 2>, <&src 3>;
+              reset-names = "byte", "dpi", "esc", "pclk";
+              phys = <&dphy>;
+              phy-names = "dphy";
+
+              panel@0 {
+                      compatible = "rocktech,jh057n00900";
+                      reg = <0>;
+                      port@0 {
+                           panel_in: endpoint {
+                                     remote-endpoint = <&mipi_dsi_out>;
+                           };
+                      };
+              };
+
+              ports {
+                    #address-cells = <1>;
+                    #size-cells = <0>;
+
+                    port@0 {
+                           reg = <0>;
+                           mipi_dsi_in: endpoint {
+                                        remote-endpoint = <&lcdif_mipi_dsi>;
+                           };
+                    };
+                    port@1 {
+                           reg = <1>;
+                           mipi_dsi_out: endpoint {
+                                         remote-endpoint = <&panel_in>;
+                           };
+                    };
+              };
+      };

2.23.0.rc1

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[email protected]
https://lists.freedesktop.org/mailman/listinfo/dri-devel

This adds initial support for the NWL MIPI DSI Host controller found on i.MX8 SoCs.

It adds support for the i.MX8MQ but the same IP can be found on e.g. the i.MX8QXP.

It has been tested on the Librem 5 devkit using mxsfb.

---
 drivers/gpu/drm/bridge/Kconfig           |   2 +
 drivers/gpu/drm/bridge/Makefile          |   1 +
 drivers/gpu/drm/bridge/nwl-dsi/Kconfig   |  16 +
 drivers/gpu/drm/bridge/nwl-dsi/Makefile  |   4 +
 drivers/gpu/drm/bridge/nwl-dsi/nwl-drv.c | 499 ++++++++++++++++
 drivers/gpu/drm/bridge/nwl-dsi/nwl-drv.h |  65 +++
 drivers/gpu/drm/bridge/nwl-dsi/nwl-dsi.c | 699 +++++++++++++++++++++++
 drivers/gpu/drm/bridge/nwl-dsi/nwl-dsi.h | 112 ++++
 8 files changed, 1398 insertions(+)
 create mode 100644 drivers/gpu/drm/bridge/nwl-dsi/Kconfig
 create mode 100644 drivers/gpu/drm/bridge/nwl-dsi/Makefile
 create mode 100644 drivers/gpu/drm/bridge/nwl-dsi/nwl-drv.c
 create mode 100644 drivers/gpu/drm/bridge/nwl-dsi/nwl-drv.h
 create mode 100644 drivers/gpu/drm/bridge/nwl-dsi/nwl-dsi.c
 create mode 100644 drivers/gpu/drm/bridge/nwl-dsi/nwl-dsi.h

index 1cc9f502c1f2..7980b5c2156f 100644
@@ -154,6 +154,8 @@ source "drivers/gpu/drm/bridge/analogix/Kconfig"
 
 source "drivers/gpu/drm/bridge/adv7511/Kconfig"
 
+source "drivers/gpu/drm/bridge/nwl-dsi/Kconfig"
+
 source "drivers/gpu/drm/bridge/synopsys/Kconfig"
 
 endmenu

index 4934fcf5a6f8..d9f6c0f77592 100644
@@ -16,4 +16,5 @@ 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-$(CONFIG_DRM_NWL_MIPI_DSI) += nwl-dsi/
 obj-y += synopsys/

new file mode 100644
index 000000000000..3b157a9f2229
@@ -0,0 +1,16 @@
+config DRM_NWL_MIPI_DSI
+	tristate "Support for Northwest Logic MIPI DSI Host controller"
+	depends on DRM
+	depends on COMMON_CLK
+	depends on OF && HAS_IOMEM
+	select DRM_KMS_HELPER
+	select DRM_MIPI_DSI
+	select DRM_PANEL_BRIDGE
+	select GENERIC_PHY_MIPI_DPHY
+	select MFD_SYSCON
+	select MULTIPLEXER
+	select REGMAP_MMIO
+	help
+	  This enables the Northwest Logic MIPI DSI Host controller as
+	  for example found on NXP's i.MX8 Processors.
+

new file mode 100644
index 000000000000..804baf2f1916
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+nwl-mipi-dsi-y := nwl-drv.o nwl-dsi.o
+obj-$(CONFIG_DRM_NWL_MIPI_DSI) += nwl-mipi-dsi.o
+header-test-y += nwl-drv.h nwl-dsi.h

2.23.0.rc1