linux-kernel - Re: [v1 2/6] arm64: dts: apq8016-sbc: Add CCI/Sensor nodes

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Date:   Wed, 11 Mar 2020 22:03:09 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Robert Foss <robert.foss@...aro.org>
Cc:     agross@...nel.org, robh+dt@...nel.org, mark.rutland@....com,
        catalin.marinas@....com, will@...nel.org, shawnguo@...nel.org,
        olof@...om.net, Anson.Huang@....com, maxime@...no.tech,
        leonard.crestez@....com, dinguyen@...nel.org,
        marcin.juszkiewicz@...aro.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Loic Poulain <loic.poulain@...aro.org>
Subject: Re: [v1 2/6] arm64: dts: apq8016-sbc: Add CCI/Sensor nodes

On Wed 11 Mar 05:34 PDT 2020, Robert Foss wrote:

> From: Loic Poulain <loic.poulain@...aro.org>
> 
> Add cci device to msm8916.dtsi.
> Add default 96boards camera node for db410c (apq8016-sbc).
> 
> Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
> Signed-off-by: Robert Foss <robert.foss@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi | 75 +++++++++++++++++++++++
>  1 file changed, 75 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi b/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
> index 037e26b3f8d5..a3e6982f4f93 100644
> --- a/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
> +++ b/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
> @@ -495,6 +495,81 @@
>  		wcnss@...b000 {
>  			status = "okay";
>  		};
> +
> +		camera_vdddo_1v8: fixedregulator@0 {

While "fixedregulator" is a seemingly good name, you're not allows to
use a unit address on the node if there's no address information in the
node. So you need to give these nodes a non-generic name.


And please move nodes without a reg (i.e. not on an mmio bus) out of
/soc, i.e. place it near /chosen.

> +			compatible = "regulator-fixed";
> +			regulator-name = "camera_vdddo";
> +			regulator-min-microvolt = <1800000>;
> +			regulator-max-microvolt = <1800000>;
> +			regulator-always-on;
> +		};
> +
> +		camera_vdda_2v8: fixedregulator@1 {
> +			compatible = "regulator-fixed";
> +			regulator-name = "camera_vdda";
> +			regulator-min-microvolt = <2800000>;
> +			regulator-max-microvolt = <2800000>;
> +			regulator-always-on;
> +		};
> +
> +		camera_vddd_1v5: fixedregulator@2 {
> +			compatible = "regulator-fixed";
> +			regulator-name = "camera_vddd";
> +			regulator-min-microvolt = <1500000>;
> +			regulator-max-microvolt = <1500000>;
> +			regulator-always-on;
> +		};
> +
> +		cci@...c000 {

Please ensure that cci and camss have labels and reference them by &cci
and &camss below the / {}, sorted by label name.

> +			status = "ok";
> +			i2c-bus@0 {

Please reference this by its label as well.

> +				camera_rear@3b {
> +					compatible = "ovti,ov5640";
> +					reg = <0x3b>;
> +
> +					enable-gpios = <&msmgpio 34 GPIO_ACTIVE_HIGH>;
> +					reset-gpios = <&msmgpio 35 GPIO_ACTIVE_LOW>;
> +					pinctrl-names = "default";
> +					pinctrl-0 = <&camera_rear_default>;
> +
> +					clocks = <&gcc GCC_CAMSS_MCLK0_CLK>;
> +					clock-names = "xclk";
> +					clock-frequency = <23880000>;
> +
> +					vdddo-supply = <&camera_vdddo_1v8>;
> +					vdda-supply = <&camera_vdda_2v8>;
> +					vddd-supply = <&camera_vddd_1v5>;
> +
> +					/* No camera mezzanine by default */

This comment gives me the feeling that this node should have been status
disabled, please confirm.

Regards,
Bjorn

> +					status = "okay";
> +
> +					port {
> +						ov5640_ep: endpoint {
> +							clock-lanes = <1>;
> +							data-lanes = <0 2>;
> +							remote-endpoint = <&csiphy0_ep>;
> +						};
> +					};
> +				};
> +			};
> +		};
> +
> +		camss@...0000 {
> +			status = "ok";
> +			ports {
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +				port@0 {
> +					reg = <0>;
> +					csiphy0_ep: endpoint {
> +						clock-lanes = <1>;
> +						data-lanes = <0 2>;
> +						remote-endpoint = <&ov5640_ep>;
> +						status = "okay";
> +					};
> +				};
> +			};
> +		};
>  	};
>  
>  	usb2513 {
> -- 
> 2.20.1
>