Re: [PATCH v2 2/4] arm64: dts: qcom: sc7280: Add support for eDP panel on CRD

[Matthias Kaehlcke <mka@chromium.org>]

On Tue, Feb 08, 2022 at 08:48:43PM +0530, Sankeerth Billakanti wrote:
> Enable the eDP display panel support without HPD on sc7280 platform.
> 
> Signed-off-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
> ---
> 
> Changes in v2:
>   - sort node references alphabetically
>   - improve readability
>   - move the pwm pinctrl to pwm node
>   - move the regulators to root
>   - define backlight power
>   - remove dummy regulator node
>   - cleanup pinctrl definitions
> 
>  arch/arm64/boot/dts/qcom/sc7280-crd.dts | 122 ++++++++++++++++++++++++++++++++
>  arch/arm64/boot/dts/qcom/sc7280.dtsi    |   2 -
>  2 files changed, 122 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sc7280-crd.dts b/arch/arm64/boot/dts/qcom/sc7280-crd.dts
> index e2efbdd..bff2707 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280-crd.dts
> +++ b/arch/arm64/boot/dts/qcom/sc7280-crd.dts
> @@ -21,6 +21,34 @@
>  	chosen {
>  		stdout-path = "serial0:115200n8";
>  	};
> +
> +	backlight_power: backlight-power {

nit: the other fixed regulator in sc7280-idp.dtsi is called
'nvme_3v3_regulator', if you wanted to be consistent you
could call this backlight_3v3_regulator.

> +		compatible = "regulator-fixed";
> +		regulator-name = "backlight_power";
> +
> +		regulator-min-microvolt = <1800000>;
> +		regulator-max-microvolt = <1800000>;
> +
> +		gpio = <&pm8350c_gpios 7 GPIO_ACTIVE_HIGH>;
> +		enable-active-high;
> +
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&edp_bl_power>;
> +	};
> +
> +	edp_power: edp-power {

nit: see above

> +		compatible = "regulator-fixed";
> +		regulator-name = "edp_power";
> +
> +		regulator-min-microvolt = <3300000>;
> +		regulator-max-microvolt = <3300000>;
> +
> +		gpio = <&tlmm 80 GPIO_ACTIVE_HIGH>;
> +		enable-active-high;
> +
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&edp_panel_power>;
> +	};
>  };
>  
>  &apps_rsc {
> @@ -76,6 +104,42 @@ ap_ts_pen_1v8: &i2c13 {
>  	};
>  };
>  
> +&edp_out {
> +	remote-endpoint = <&edp_panel_in>;
> +};
> +
> +&mdss {
> +	status = "okay";
> +};
> +
> +&mdss_edp {
> +	status = "okay";
> +
> +	vdda-1p2-supply = <&vreg_l6b_1p2>;
> +	vdda-0p9-supply = <&vreg_l10c_0p8>;
> +};
> +
> +&mdss_edp_phy {
> +	status = "okay";
> +
> +	vdda-1p2-supply = <&vreg_l6b_1p2>;
> +	vdda-0p9-supply = <&vreg_l10c_0p8>;
> +};
> +
> +&mdss_dp {

should be before 'mdss_edp'.

> +	status = "okay";
> +
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&dp_hot_plug_det>;
> +	data-lanes = <0 1>;
> +	vdda-1p2-supply = <&vreg_l6b_1p2>;
> +	vdda-0p9-supply = <&vreg_l1b_0p8>;
> +};
> +
> +&mdss_mdp {
> +	status = "okay";
> +};
> +
>  &nvme_3v3_regulator {
>  	gpio = <&tlmm 51 GPIO_ACTIVE_HIGH>;
>  };
> @@ -84,7 +148,65 @@ ap_ts_pen_1v8: &i2c13 {
>  	pins = "gpio51";
>  };
>  
> +&pm8350c_pwm {
> +	status = "okay";
> +
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&edp_bl_pwm>;
> +};
> +
> +&pm8350c_gpios {

should be before 'pm8350c_pwm'

> +	edp_bl_power: edp-bl-power {
> +		pins = "gpio7";
> +		function = "normal";
> +		qcom,drive-strength = <PMIC_GPIO_STRENGTH_LOW>;
> +		bias-disable;
> +		output-low;
> +	};
> +
> +	edp_bl_pwm: edp-bl-pwm {
> +		pins = "gpio8";
> +		function = "func1";
> +		qcom,drive-strength = <PMIC_GPIO_STRENGTH_LOW>;
> +		bias-disable;
> +		output-low;
> +	};
> +};
> +
> +&soc {
> +	edp_backlight: edp-backlight {
> +		compatible = "pwm-backlight";
> +
> +		power-supply = <&backlight_power>;
> +		pwms = <&pm8350c_pwm 3 65535>;
> +	};
> +
> +	edp_panel: edp_panel {

in difference to labels node names should use dashes as separator, not
underscores (i.e. 'edp-panel')

> +		compatible = "sharp,lq140m1jw46";
> +
> +		power-supply = <&edp_power>;
> +		backlight = <&edp_backlight>;
> +
> +		ports {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +			port@0 {
> +				reg = <0>;
> +				edp_panel_in: endpoint {
> +					remote-endpoint = <&edp_out>;
> +				};
> +			};
> +		};
> +	};
> +};
> +
>  &tlmm {
> +	edp_panel_power: edp-panel-power {
> +		pins = "gpio80";
> +		function = "gpio";
> +		bias-pull-down;
> +	};
> +
>  	tp_int_odl: tp-int-odl {
>  		pins = "gpio7";
>  		function = "gpio";
> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> index 3572399..f8fa716 100644
> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
> @@ -3012,8 +3012,6 @@
>  
>  			mdss_edp: edp@aea0000 {
>  				compatible = "qcom,sc7280-edp";
> -				pinctrl-names = "default";
> -				pinctrl-0 = <&edp_hot_plug_det>;

This was just added a few days ago by commit 118cd3b8ec0d ("arm64: dts: qcom:
sc7280: Add edp_out port and HPD lines"). The patch assumes that the 'Hot
Plug Detect line (which functions as "panel ready" in eDP) is highly likely
to be used by boards.'. If that is indeed the case and the CRD is the
exception then it seems that deleting the two properties from the CRD DT
would be a better solution.