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SubjectRe: [RFC PATCH] ARM: dts: add panel and tcon nodes to Allwinner A33 Q8 tablet dts
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Hi,

On 06-11-16 12:11, Icenowy Zheng wrote:
> All A33 Q8 tablets features a LCD panel, with a resolution of either
> 800x480 or 1024x600.
>
> Add "bone" device nodes to the device tree.

Bone ?

>
> Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>

He, as discussed in the other thread since sun8i-a33-q8-tablet.dts
is used for both 800x480 and 1024x600 versions we really need to
introduce new sun8i-a33-q8-tablet-800x600.dts and
sun8i-a33-q8-tablet-1024x600.dts files, which include
sun8i-a33-q8-tablet.dts and then add just the panel bits; and patch
newer u-boots to use those instead.

This way people who stick with an old u-boot will just not get
the drm driver, rather then all of a sudden getting a wrong
resolution.

Icenowy, can you please also submit a matching u-boot patch
(both the new dts file, as well as updating the defconfig you
use to the new dts file)?

Regards,

Hans



> ---
>
> Maybe it will be better to add them to sun8i-q8-reference-tablet.dtsi, as
> these pin configurations are part of reference design of both A23 and A33,
> not only restricted to Q8.
>
> The DTS file is tested by me, after cherry-picks this patch from Chen-Yu Tsai:
> https://github.com/wens/linux/commit/2823b887a289fbee5f97f3c6b45ed6c74a6368c6
>
> And add these commands to my U-Boot boot command:
>
> fdt addr 0x43000000
> fdt resize
> fdt set /panel compatible "urt,umsh-8596md-t"
> fdt set /panel status "okay"
> fdt set /display-engine status "okay"
> fdt set /soc@01c00000/lcd-controller@01c0c000 status "okay"
>
> arch/arm/boot/dts/sun8i-a33-q8-tablet.dts | 44 +++++++++++++++++++++++++++++++
> 1 file changed, 44 insertions(+)
>
> diff --git a/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts b/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
> index b0bc236..871a20c 100644
> --- a/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
> +++ b/arch/arm/boot/dts/sun8i-a33-q8-tablet.dts
> @@ -47,4 +47,48 @@
> / {
> model = "Q8 A33 Tablet";
> compatible = "allwinner,q8-a33", "allwinner,sun8i-a33";
> +
> + panel: panel {
> + /* compatible should be set according to the panel */
> + pinctrl-names = "default";
> + pinctrl-0 = <&lcd_en_q8>;
> + backlight = <&backlight>;
> + enable-gpios = <&pio 7 7 GPIO_ACTIVE_HIGH>; /* PH7 */
> + power-supply = <&reg_dc1sw>;
> + status = "disabled";
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + port@0 {
> + reg = <0>;
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + panel_input: endpoint@0 {
> + reg = <0>;
> + remote-endpoint = <&tcon0_out_lcd>;
> + };
> + };
> + };
> +};
> +
> +&tcon0 {
> + pinctrl-names = "default";
> + pinctrl-0 = <&lcd_rgb666_pins>;
> +};
> +
> +&tcon0_out {
> + tcon0_out_lcd: endpoint@0 {
> + reg = <0>;
> + remote-endpoint = <&panel_input>;
> + };
> +};
> +
> +&pio {
> + lcd_en_q8: lcd_en@0 {
> + allwinner,pins = "PH7";
> + allwinner,function = "gpio_out";
> + allwinner,drive = <SUN4I_PINCTRL_10_MA>;
> + allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
> + };
> };
>

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