linux-kernel - Re: [PATCH 1/2] arm64: dts: qcom: c630: Add backlight controller

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Message-ID: <300f9ec9-da52-235f-ea3c-b49bdc8bfb75@kali.org>
Date:   Tue, 8 Feb 2022 06:35:08 -0600
From:   Steev Klimaszewski <steev@...i.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arm64: dts: qcom: c630: Add backlight controller


On 2/7/22 10:16 PM, Bjorn Andersson wrote:
> The Lenovo Yoga C630 uses the PWM controller in the TI SN65DSI86 bridge
> chip to provide a signal for the backlight control and has TLMM GPIO 11
> attached to some regulator that drives the backlight.
>
> Unfortunately the regulator attached to this gpio is also powering the
> camera, so turning off backlight result in the detachment of the camera
> as well.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>   arch/arm64/boot/dts/qcom/sdm850-lenovo-yoga-c630.dts | 8 ++++++++
>   1 file changed, 8 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/sdm850-lenovo-yoga-c630.dts b/arch/arm64/boot/dts/qcom/sdm850-lenovo-yoga-c630.dts
> index 58845a14805f..55fb7302245b 100644
> --- a/arch/arm64/boot/dts/qcom/sdm850-lenovo-yoga-c630.dts
> +++ b/arch/arm64/boot/dts/qcom/sdm850-lenovo-yoga-c630.dts
> @@ -59,6 +59,7 @@ mode {
>   	panel {
>   		compatible = "boe,nv133fhm-n61";
>   		no-hpd;
> +		backlight = <&backlight>;
>   
>   		ports {
>   			port {
> @@ -98,6 +99,12 @@ sn65dsi86_refclk: sn65dsi86-refclk {
>   
>   		clock-frequency = <19200000>;
>   	};
> +
> +	backlight: backlight {
> +		compatible = "pwm-backlight";
> +		pwms = <&sn65dsi86 1000000>;
> +		enable-gpios = <&tlmm 11 GPIO_ACTIVE_HIGH>;
> +	};
>   };
>   
>   &adsp_pas {
> @@ -419,6 +426,7 @@ sn65dsi86: bridge@2c {
>   		clock-names = "refclk";
>   
>   		no-hpd;
> +		#pwm-cells = <1>;
>   
>   		ports {
>   			#address-cells = <1>;
Tested-by: Steev Klimaszewski <steev@...i.org>