linux-kernel - Re: [PATCH 4/6] arm64: dts: qcom: qcs6490-rb3gen2: Enable IMX577 camera sensor

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Message-ID: <90fa688a-8107-4c7e-8056-761f7432dff8@linaro.org>
Date: Sat, 29 Jun 2024 12:22:44 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Vikram Sharma <quic_vikramsa@...cinc.com>, Robert Foss
 <rfoss@...nel.org>, Todor Tomov <todor.too@...il.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Kapatrala Syed <akapatra@...cinc.com>,
 Hariram Purushothaman <hariramp@...cinc.com>,
 cros-qcom-dts-watchers@...omium.org, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>,
 Loic Poulain <loic.poulain@...aro.org>, Andi Shyti <andi.shyti@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-media@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-i2c@...r.kernel.org, Hariram Purushothaman <quic_hariramp@...cinc.com>
Subject: Re: [PATCH 4/6] arm64: dts: qcom: qcs6490-rb3gen2: Enable IMX577
 camera sensor

On 28/06/2024 19:32, Vikram Sharma wrote:
> Enable IMX577 camera sensor for qcs6490-rb3gen2.
> 
> Signed-off-by: Hariram Purushothaman <quic_hariramp@...cinc.com>
> Signed-off-by: Vikram Sharma <quic_vikramsa@...cinc.com>
> ---
>   arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts | 67 ++++++++++++++++++++++++++++
>   1 file changed, 67 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> index c4cde4328e3d..237231600dca 100644
> --- a/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts
> +++ b/arch/arm64/boot/dts/qcom/qcs6490-rb3gen2.dts

I believe the rb3gen2 can be sold with and without the camera mezzanine 
[1], so the approach we have taken for a similar situation on rb5 was to 
have a separate mezzanine dts which includes the baseboard and extends it.


arch/arm64/boot/dts/qcom/qrb5165-rb5.dts
arch/arm64/boot/dts/qcom/qrb5165-rb5-vision-mezzanine.dts

Please replicate that model here.

[1] https://www.thundercomm.com/product/qualcomm-rb3-gen-2/#versions

> @@ -513,6 +513,73 @@ vreg_bob_3p296: bob {
>   	};
>   };
>   
> +&camcc {
> +	status = "okay";
> +};
> +
> +&camss {
> +	status = "disabled";

once you move this into its own dts the camera should be enabled by 
default for that .dtb

> +	ports {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		/* The port index denotes CSIPHY id i.e. csiphy2 */
> +		port@3 {
> +			reg = <3>;

copy/past splat from the rb5

port@3 means csiphy3

> +			csiphy3_ep: endpoint {
> +				clock-lanes = <7>;
> +				data-lanes = <0 1 2 3>;
> +				remote-endpoint = <&imx412_ep>;
> +			};
> +		};
> +	};
> +};
> +
> +&cci0 {
> +	status = "okay";
> +};

You're enabling cci0 here but not the sensor for it - presumably a 
monochrome sensor attached to one of the other CSIPHYs.

Zap cci0 here until you add that other sensor.

> +
> +&cci1 {
> +	status = "okay";
> +};
> +
> +&cci1_i2c1 {
> +	camera@1a {
> +		/*
> +		 * rb3gen2 ships with an imx577. qcom treats imx412
> +		 * and imx577 the same way. Absent better data do the same here.
> +		 */
> +		compatible = "sony,imx412";
> +		reg = <0x1a>;

The commit log says imx577 but the comapt string says imx412.

Choose which one and maintain the namespace. Its an imx577 right ? 
Upstream kernel has the relevant compat string

Commit: 1251663220d9 ("media: i2c: imx412: Add new compatible strings")

You can just cherry-pick that commit to your kernel and then the 
upstream dts and downstream dts will be compatible.


> +
> +		reset-gpios = <&tlmm 78 GPIO_ACTIVE_LOW>;
> +		pinctrl-names = "default", "suspend";
> +		pinctrl-0 = <&cam2_default>;
> +		pinctrl-1 = <&cam2_suspend>;
> +
> +		clocks = <&camcc CAM_CC_MCLK3_CLK>,
> +				 <&camcc CAM_CC_MCLK2_CLK>;
> +		assigned-clocks = <&camcc CAM_CC_MCLK3_CLK>,
> +				 <&camcc CAM_CC_MCLK2_CLK>;

This looks funny - why do you have MCLK2 ?

One final thing, you appear to be missing some power rails here no ?

e.g. rb5

         vdda-phy-supply = <&vreg_l5a_0p88>;
         vdda-pll-supply = <&vreg_l9a_1p2>;

---
bod