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Date:   Sun, 6 Nov 2016 15:27:11 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Icenowy Zheng <icenowy@...c.xyz>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [RFC PATCH] ARM: dts: add panel and tcon nodes to Allwinner A33
 Q8 tablet dts

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@...c.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@...00000/lcd-controller@...0c000 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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