linux-kernel - Re: [PATCH 3/3] ARM: dts: qcom: apq8026-samsung-matisse-wifi: Add display backlight

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Date:   Sat, 7 Jan 2023 11:41:12 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Matti Lehtimäki <matti.lehtimaki@...il.com>,
        linux-arm-msm@...r.kernel.org
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] ARM: dts: qcom: apq8026-samsung-matisse-wifi: Add
 display backlight



On 6.01.2023 12:44, Matti Lehtimäki wrote:
> Uses ti,lp8556 backlight with clk-pwm.
> 
> Signed-off-by: Matti Lehtimäki <matti.lehtimaki@...il.com>
> ---
>  .../dts/qcom-apq8026-samsung-matisse-wifi.dts | 59 +++++++++++++++++++
>  1 file changed, 59 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/qcom-apq8026-samsung-matisse-wifi.dts b/arch/arm/boot/dts/qcom-apq8026-samsung-matisse-wifi.dts
> index 15b9590ba07b..848cfda64e5a 100644
> --- a/arch/arm/boot/dts/qcom-apq8026-samsung-matisse-wifi.dts
> +++ b/arch/arm/boot/dts/qcom-apq8026-samsung-matisse-wifi.dts
> @@ -23,6 +23,14 @@ aliases {
>  		display0 = &framebuffer0;
>  	};
>  
> +	backlight_pwm: pwm {
This should be sorted alphabetically.


> +		compatible = "clk-pwm";
> +		#pwm-cells = <2>;
> +		clocks = <&mmcc CAMSS_GP0_CLK>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&backlight_pwm_default_state>;
> +	};
> +
>  	chosen {
>  		#address-cells = <1>;
>  		#size-cells = <1>;
> @@ -80,6 +88,45 @@ key-volume-up {
>  		};
>  	};
>  
> +	i2c-backlight {
> +		compatible = "i2c-gpio";
> +		sda-gpios = <&tlmm 20 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
> +		scl-gpios = <&tlmm 21 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
> +
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&backlight_i2c_default_state>;
Please reorder these two properties.

> +
> +		i2c-gpio,delay-us = <4>;
> +
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		backlight@2c {
> +			compatible = "ti,lp8556";
> +			reg = <0x2c>;
> +
> +			dev-ctrl = /bits/ 8 <0x80>;
> +			init-brt = /bits/ 8 <0x3f>;
> +			pwm-period = <100000>;
> +
> +			pwms = <&backlight_pwm 0 100000>;
> +			pwm-names = "lp8556";
> +
> +			rom-a0h {
> +				rom-addr = /bits/ 8 <0xa0>;
> +				rom-val = /bits/ 8 <0x44>;
> +			};
Please add a newline between each subnode.

Otherwise I think this looks good..

Konrad

> +			rom-a1h {
> +				rom-addr = /bits/ 8 <0xa1>;
> +				rom-val = /bits/ 8 <0x6c>;
> +			};
> +			rom-a5h {
> +				rom-addr = /bits/ 8 <0xa5>;
> +				rom-val = /bits/ 8 <0x24>;
> +			};
> +		};
> +	};
> +
>  	reg_tsp_1p8v: regulator-tsp-1p8v {
>  		compatible = "regulator-fixed";
>  		regulator-name = "tsp_1p8v";
> @@ -418,6 +465,18 @@ accel_int_default_state: accel-int-default-state {
>  		bias-disable;
>  	};
>  
> +	backlight_i2c_default_state: backlight-i2c-default-state {
> +		pins = "gpio20", "gpio21";
> +		function = "gpio";
> +		drive-strength = <2>;
> +		bias-disable;
> +	};
> +
> +	backlight_pwm_default_state: backlight-pwm-default-state {
> +		pins = "gpio33";
> +		function = "gp0_clk";
> +	};
> +
>  	muic_int_default_state: muic-int-default-state {
>  		pins = "gpio67";
>  		function = "gpio";