linux-kernel - Re: [linux-sunxi] [PATCH v2 5/5] arm64: allwinner: dts: a64: add LCD-related device nodes for PinePhone

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Date:   Thu, 19 Mar 2020 22:51:36 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, Ondrej Jirman <megous@...ous.com>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...glegroups.com
Subject: Re: [linux-sunxi] [PATCH v2 5/5] arm64: allwinner: dts: a64: add
 LCD-related device nodes for PinePhone

在 2020-03-16星期一的 21:35 +0800，Icenowy Zheng写道：
> PinePhone uses PWM backlight and a XBD599 LCD panel over DSI for
> display.
> 
> Add its device nodes.
> 
> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> ---
> No changes in v2.
> 
>  .../dts/allwinner/sun50i-a64-pinephone.dtsi   | 37
> +++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> index cefda145c3c9..96d9150423e0 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
> @@ -16,6 +16,15 @@ aliases {
>  		serial0 = &uart0;
>  	};
>  
> +	backlight: backlight {
> +		compatible = "pwm-backlight";
> +		pwms = <&r_pwm 0 50000 PWM_POLARITY_INVERTED>;
> +		brightness-levels = <0 16 18 20 22 24 26 29 32 35 38 42
> 46 51 56 62 68 75 83 91 100>;

Should I drop the 0 here and replace it with 14?

I have heard community complaining about setting 0 to brightness make
the screen black.

(I think in this situation bl_power or blank the DSI panel can still
totally shut down the backlight).

> +		default-brightness-level = <15>;
> +		enable-gpios = <&pio 7 10 GPIO_ACTIVE_HIGH>; /* PH10 */
> +		power-supply = <&reg_ldo_io0>;
> +	};
> +
>  	chosen {
>  		stdout-path = "serial0:115200n8";
>  	};
> @@ -84,6 +93,30 @@ &dai {
>  	status = "okay";
>  };
>  
> +&de {
> +	status = "okay";
> +};
> +
> +&dphy {
> +	status = "okay";
> +};
> +
> +&dsi {
> +	vcc-dsi-supply = <&reg_dldo1>;
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	status = "okay";
> +
> +	panel@0 {
> +		compatible = "xingbangda,xbd599";
> +		reg = <0>;
> +		reset-gpios = <&pio 3 23 GPIO_ACTIVE_LOW>; /* PD23 */
> +		iovcc-supply = <&reg_dldo2>;
> +		vcc-supply = <&reg_ldo_io0>;
> +		backlight = <&backlight>;
> +	};
> +};
> +
>  &ehci0 {
>  	status = "okay";
>  };
> @@ -188,6 +221,10 @@ &r_pio {
>  	 */
>  };
>  
> +&r_pwm {
> +	status = "okay";
> +};
> +
>  &r_rsb {
>  	status = "okay";
>  
> -- 
> 2.24.1
>