Without this patch the following error will be shown:
stdio_add_devices: Video device failed (ret=-22)
As commit ec5507707a1d1e84056a6c864338f95f6118d3ca (video: tegra: Move to using simple-panel and pwm-backlight) states the Colibri T20 needs updating too which this patch finally attempts doing.
Please note that the current U-Boot implementation requires a dummy GPIO e.g. for a fixed backlight regulator to be explicitly defined in order to work unlike in the Linux kernel where this is taken care of automatically.
Signed-off-by: Marcel Ziswiler marcel.ziswiler@toradex.com ---
arch/arm/dts/tegra20-colibri.dts | 72 +++++++++++++++++++++++++++++----------- 1 file changed, 52 insertions(+), 20 deletions(-)
diff --git a/arch/arm/dts/tegra20-colibri.dts b/arch/arm/dts/tegra20-colibri.dts index 2cf24d3..7d4e64a 100644 --- a/arch/arm/dts/tegra20-colibri.dts +++ b/arch/arm/dts/tegra20-colibri.dts @@ -21,12 +21,24 @@ };
host1x@50000000 { - status = "okay"; dc@54200000 { - status = "okay"; rgb { status = "okay"; nvidia,panel = <&lcd_panel>; + display-timings { + timing@0 { + /* VESA VGA */ + clock-frequency = <25175000>; + hactive = <640>; + vactive = <480>; + hback-porch = <48>; + hfront-porch = <16>; + hsync-len = <96>; + vback-porch = <31>; + vfront-porch = <11>; + vsync-len = <2>; + }; + }; }; }; }; @@ -60,6 +72,10 @@ }; };
+ pwm@7000a000 { + status = "okay"; + }; + /* * GEN1_I2C: I2C_SDA/SCL on SODIMM pin 194/196 (e.g. RTC on carrier * board) @@ -91,6 +107,19 @@ cd-gpios = <&gpio TEGRA_GPIO(C, 7) GPIO_ACTIVE_LOW>; };
+ backlight: backlight { + compatible = "pwm-backlight"; + + brightness-levels = <255 128 64 32 16 8 4 0>; + default-brightness-level = <6>; + /* BL_ON */ + enable-gpios = <&gpio TEGRA_GPIO(T, 4) GPIO_ACTIVE_HIGH>; + /* Dummy */ + power-supply = <®_dummy>; + /* PWM<A> */ + pwms = <&pwm 0 5000000>; + }; + clocks { compatible = "simple-bus"; #address-cells = <1>; @@ -104,25 +133,28 @@ }; };
- pwm: pwm@7000a000 { - status = "okay"; + lcd_panel: panel { + /* + * edt,et057090dhu: EDT 5.7" LCD TFT + * edt,et070080dh6: EDT 7.0" LCD TFT + */ + compatible = "edt,et057090dhu", "simple-panel"; + + backlight = <&backlight>; };
- lcd_panel: panel { - clock = <25175000>; - xres = <640>; - yres = <480>; - left-margin = <48>; /* horizontal back porch */ - right-margin = <16>; /* horizontal front porch */ - hsync-len = <96>; - lower-margin = <11>; /* vertical front porch */ - upper-margin = <31>; /* vertical back porch */ - vsync-len = <2>; - hsync-active-high; - vsync-active-high; - nvidia,bits-per-pixel = <16>; - nvidia,pwm = <&pwm 0 0>; - nvidia,backlight-enable-gpios = <&gpio TEGRA_GPIO(T, 4) GPIO_ACTIVE_HIGH>; - nvidia,panel-timings = <0 0 0 0>; + regulators { + compatible = "simple-bus"; + #address-cells = <1>; + #size-cells = <0>; + + reg_dummy: regulator@0 { + compatible = "regulator-fixed"; + reg = <0>; + regulator-name = "Dummy"; + /* Dummy N/C */ + gpio = <&gpio TEGRA_GPIO(V, 7) GPIO_ACTIVE_HIGH>; + enable-active-high; + }; }; };