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

On 06-11-16 17:53, Icenowy Zheng wrote:
>
>
> 06.11.2016, 22:27, "Hans de Goede" <hdegoede@redhat.com>:
>> 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)?
>
> Could you choose a compatible for 1024x600 variant?

Lets just add a sun8i-a33-q8-tablet-800x600.dts now and then
I will add a sun8i-a33-q8-tablet-1024x600.dts file later.

Regards,

Hans



>
> (Since I have never such a Q8 tablet)
>
>>
>> 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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