[PATCH 8/8] arm64: dts: allwinner: rg35xx: Add GPIO backlight control

[Philippe Simons]

Tested on RG355XX-H

Tested-by: Philippe Simons <simons.philippe at gmail.com>

On 16/02/2025 10:27, Ryan Walklin wrote:
> The LCD backlight for this device can be exposed as a simple GPIO-
> controlled device. It would be more accurately modelled using PWM to
> enable brightness control, however the PWM driver design for the H616 is
> not yet upstreamed.
>
> Add a GPIO backlight node to the DTS.
>
> Signed-off-by: Ryan Walklin <ryan at testtoast.com>
> ---
>   .../boot/dts/allwinner/sun50i-h700-anbernic-rg35xx-2024.dts | 6 ++++++
>   1 file changed, 6 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h700-anbernic-rg35xx-2024.dts b/arch/arm64/boot/dts/allwinner/sun50i-h700-anbernic-rg35xx-2024.dts
> index 388487d4720e2..29d1144fc3987 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-h700-anbernic-rg35xx-2024.dts
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-h700-anbernic-rg35xx-2024.dts
> @@ -21,6 +21,12 @@ aliases {
>   		serial0 = &uart0;
>   	};
>   
> +	backlight: backlight {
> +		compatible = "gpio-backlight";
> +		gpios = <&pio 3 28 GPIO_ACTIVE_HIGH>; // PD28
> +		default-on;
> +	};
> +	
>   	battery: battery {
>   		compatible = "simple-battery";
>   		constant-charge-current-max-microamp = <1024000>;