ARM: dts: da850-evm: Enable LCD and Backlight
PATCH v7 1/1 ARM: dts: da850-evm: Enable LCD and Backlight
When using the board files the LCD works, but not with the DT. This adds enables the original da850-evm to work with the same LCD in device tree mode.
The EVM has a gpio for the regulator and a PWM for dimming the backlight. The LCD and the vpif display pins are mutually exclusive, so if using the LCD, do not load the vpif driver.
---
V7: Missed one reference to backlight_reg->backlight_lcd
V6: Fix some whitespace and comment formatting. Rename backlight_reg to
backlight_lcd
V5: Resync against v4.18/dt
V4: Move the backlight to PWM, so the driver can control the regulator allowing the
regulator to power down and enabling the ability to change the brightness of the backlight
V3: Fix errant GPIO, label GPIO pins, and rename the regulator to be more explict to
backlight which better matches the schematic. Updated the description to explain that it cannot be used at the same time as the vpif driver.
V2: Add regulator and GPIO enable pins. Remove PWM backlight and replace with GPIO
arch/arm/boot/dts/da850-evm.dts +77 -1
@@ -27,6 +27,60 @@ spi0 = &spi1; }; + backlight: backlight-pwm { + pinctrl-names = "default"; + pinctrl-0 = <&ecap2_pins>; + power-supply = <&backlight_lcd>; + compatible = "pwm-backlight"; + pwms = <&ecap2 0 50000 0>; + brightness-levels = <0 10 20 30 40 50 60 70 80 90 99>; + default-brightness-level = <7>; + }; + + panel { + compatible = "ti,tilcdc,panel"; + pinctrl-names = "default"; + pinctrl-0 = <&lcd_pins>; + /* + * The vpif and the LCD are mutually exclusive. + * To enable VPIF, change the status below to 'disabled' then + * then change the status of the vpif below to 'okay' + */ + status = "okay"; + enable-gpios = <&gpio 40 GPIO_ACTIVE_HIGH>; /* lcd_panel_pwr */ + + panel-info { + ac-bias = <255>; + ac-bias-intrpt = <0>; + dma-burst-sz = <16>; + bpp = <16>; + fdd = <0x80>; + sync-edge = <0>; + sync-ctrl = <1>; + raster-order = <0>; + fifo-th = <0>; + }; + + display-timings { + native-mode = <&timing0>; + timing0: 480x272 { + clock-frequency = <9000000>; + hactive = <480>; + vactive = <272>; + hfront-porch = <3>; + hback-porch = <2>; + hsync-len = <42>; + vback-porch = <3>; + vfront-porch = <4>; + vsync-len = <11>; + hsync-active = <0>; + vsync-active = <0>; + de-active = <1>; + pixelclk-active = <1>; + }; + }; + }; + vbat: fixedregulator0 { compatible = "regulator-fixed"; regulator-name = "vbat";
@@ -35,6 +89,15 @@ regulator-boot-on; }; + backlight_lcd: backlight-regulator { + compatible = "regulator-fixed"; + regulator-name = "lcd_backlight_pwr"; + regulator-min-microvolt = <3300000>; + regulator-max-microvolt = <3300000>; + gpio = <&gpio 47 GPIO_ACTIVE_HIGH>; /* lcd_backlight_pwr */ + enable-active-high; + }; + sound { compatible = "simple-audio-card"; simple-audio-card,name = "DA850/OMAP-L138 EVM";
@@ -63,6 +126,10 @@ }; }; +&ecap2 { + status = "okay"; +}; + &pmx_core { status = "okay";
@@ -109,6 +176,10 @@ status = "okay"; }; +&lcdc { + status = "okay"; +}; + &i2c0 { status = "okay"; clock-frequency = <100000>;
@@ -336,5 +407,10 @@ &vpif { pinctrl-names = "default"; pinctrl-0 = <&vpif_capture_pins>, <&vpif_display_pins>; - status = "okay"; + /* + * The vpif and the LCD are mutually exclusive. + * To enable VPIF, disable the ti,tilcdc,panel then + * changed the status below to 'okay' + */ + status = "disabled"; };
Signature · 1 line
2.17.0
PATCH v7 1/1 ARM: dts: da850-evm: Enable LCD and Backlight
Quoted 15 lines · Adam Ford
When using the board files the LCD works, but not with the DT. This adds enables the original da850-evm to work with the same LCD in device tree mode.
The EVM has a gpio for the regulator and a PWM for dimming the backlight. The LCD and the vpif display pins are mutually exclusive, so if using the LCD, do not load the vpif driver.
Signed-off-by Adam Ford <[email protected]>arch/arm/boot/dts/da850-evm.dts +0
-0
arch/arm/boot/dts/da850-evm.dts line 35
Quoted 9 lines
arch/arm/boot/dts/da850-evm.dts +6
-0@@ -27,6 +27,60 @@ spi0 = &spi1; }; + backlight: backlight-pwm { + pinctrl-names = "default"; + pinctrl-0 = <&ecap2_pins>; + power-supply = <&backlight_lcd>; + compatible = "pwm-backlight"; + pwms = <&ecap2 0 50000 0>;
It will be nice to add a comment here: "The PWM here corresponds to production hardware. The schematic needs to be 1015171 (15 March 2010), Rev A or newer."
arch/arm/boot/dts/da850-evm.dts line 48
Quoted 13 lines
arch/arm/boot/dts/da850-evm.dts +13
-0+ brightness-levels = <0 10 20 30 40 50 60 70 80 90 99>; + default-brightness-level = <7>; + }; + + panel { + compatible = "ti,tilcdc,panel"; + pinctrl-names = "default"; + pinctrl-0 = <&lcd_pins>; + /* + * The vpif and the LCD are mutually exclusive. + * To enable VPIF, change the status below to 'disabled' then + * then change the status of the vpif below to 'okay' + */
This results in checkpatch warning:
[PATCH V7] ARM: dts: da850-evm: Enable LCD and Backlight.eml:153: WARNING: Block comments should align the * on each line [PATCH V7] ARM: dts: da850-evm: Enable LCD and Backlight.eml:239: WARNING: Block comments should align the * on each line
arch/arm/boot/dts/da850-evm.dts line 415
Quoted 10 lines
arch/arm/boot/dts/da850-evm.dts +6
-1&vpif { pinctrl-names = "default"; pinctrl-0 = <&vpif_capture_pins>, <&vpif_display_pins>; - status = "okay"; + /* + * The vpif and the LCD are mutually exclusive. + * To enable VPIF, disable the ti,tilcdc,panel then + * changed the status below to 'okay' + */ + status = "disabled";
Are you able to see VPIF is disabled after this? Trying your patch, I still see VPIF probing[1]. Also, only VPIF display has a conflict with LCD, correct (capture should be fine)?
Thanks,
Sekhar
[1]
[ 34.739314] adv7343 0-002a: chip found @ 0x54 (DaVinci I2C adapter) [ 34.881422] vpif_display vpif_display: Pixel details: Width = 720,Height = 480 [ 34.881506] vpif_display vpif_display: channel=5bf2d970,channel->video_dev=5bf2d970 [ 34.883374] vpif_display vpif_display: Pixel details: Width = 720,Height = 480 [ 34.883450] vpif_display vpif_display: channel=16041996,channel->video_dev=16041996 [ 35.370777] tvp514x 0-005d: tvp514x 0-005d decoder driver registered !! [ 35.470088] vpif_capture vpif_capture: registered sub device tvp514x-0 [ 35.827492] tvp514x 0-005c: tvp514x 0-005c decoder driver registered !! [ 35.866031] vpif_capture vpif_capture: registered sub device tvp514x-1 [ 35.953752] vpif_capture vpif_capture: VPIF capture driver initialized
# ls /dev/video video0 video1 video2 video3
PATCH v7 1/1 ARM: dts: da850-evm: Enable LCD and Backlight
Quoted 49 lines · Sekhar Nori
Quoted 15 lines · Adam Ford
When using the board files the LCD works, but not with the DT. This adds enables the original da850-evm to work with the same LCD in device tree mode.
The EVM has a gpio for the regulator and a PWM for dimming the backlight. The LCD and the vpif display pins are mutually exclusive, so if using the LCD, do not load the vpif driver.
Signed-off-by Adam Ford <[email protected]>arch/arm/boot/dts/da850-evm.dts +0
-0arch/arm/boot/dts/da850-evm.dts line 35
Quoted 9 lines
arch/arm/boot/dts/da850-evm.dts +6
-0@@ -27,6 +27,60 @@ spi0 = &spi1; }; + backlight: backlight-pwm { + pinctrl-names = "default"; + pinctrl-0 = <&ecap2_pins>; + power-supply = <&backlight_lcd>; + compatible = "pwm-backlight"; + pwms = <&ecap2 0 50000 0>;It will be nice to add a comment here: "The PWM here corresponds to production hardware. The schematic needs to be 1015171 (15 March 2010), Rev A or newer."
arch/arm/boot/dts/da850-evm.dts line 48
Quoted 13 lines
arch/arm/boot/dts/da850-evm.dts +13
-0+ brightness-levels = <0 10 20 30 40 50 60 70 80 90 99>; + default-brightness-level = <7>; + }; + + panel { + compatible = "ti,tilcdc,panel"; + pinctrl-names = "default"; + pinctrl-0 = <&lcd_pins>; + /* + * The vpif and the LCD are mutually exclusive. + * To enable VPIF, change the status below to 'disabled' then + * then change the status of the vpif below to 'okay' + */This results in checkpatch warning:
[PATCH V7] ARM: dts: da850-evm: Enable LCD and Backlight.eml:153: WARNING: Block comments should align the * on each line [PATCH V7] ARM: dts: da850-evm: Enable LCD and Backlight.eml:239: WARNING: Block comments should align the * on each line
Quoted 14 lines
arch/arm/boot/dts/da850-evm.dts line 415
Quoted 10 lines
arch/arm/boot/dts/da850-evm.dts +6
-1&vpif { pinctrl-names = "default"; pinctrl-0 = <&vpif_capture_pins>, <&vpif_display_pins>; - status = "okay"; + /* + * The vpif and the LCD are mutually exclusive. + * To enable VPIF, disable the ti,tilcdc,panel then + * changed the status below to 'okay' + */ + status = "disabled";Are you able to see VPIF is disabled after this? Trying your patch, I still see VPIF probing[1]. Also, only VPIF display has a conflict with LCD, correct (capture should be fine)?
To answer myself, I forgot that VPIF is bit special because it is registered through pdata-quirks. As such the parent vpif node is used only for pinmux setting. I do think the platform devices for capture and display should not be registered if the vpif parent node is disabled in DT. But thats a subject of another patch.
With that, I fixed up my comments above locally and added this in queue for v4.19
Thanks,
Sekhar