linux-kernel - Re: [PATCH v1 2/2] arm64: dts: qcom: sa8775p: Add support for camss

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Message-ID: <6e98b5ca-3ff1-44c3-928f-e993cf29215f@oss.qualcomm.com>
Date: Mon, 14 Apr 2025 15:44:50 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Vikram Sharma <quic_vikramsa@...cinc.com>, rfoss@...nel.org,
        todor.too@...il.com, bryan.odonoghue@...aro.org, mchehab@...nel.org,
        robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
        andersson@...nel.org, konradybcio@...nel.org, hverkuil-cisco@...all.nl,
        cros-qcom-dts-watchers@...omium.org, catalin.marinas@....com,
        will@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Suresh Vankadara <quic_svankada@...cinc.com>
Subject: Re: [PATCH v1 2/2] arm64: dts: qcom: sa8775p: Add support for camss

On 2/10/25 4:56 PM, Vikram Sharma wrote:
> Add changes to support the camera subsystem on the SA8775P.
> 
> Co-developed-by: Suresh Vankadara <quic_svankada@...cinc.com>
> Signed-off-by: Suresh Vankadara <quic_svankada@...cinc.com>
> Signed-off-by: Vikram Sharma <quic_vikramsa@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/sa8775p.dtsi | 187 ++++++++++++++++++++++++++
>  1 file changed, 187 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/sa8775p.dtsi b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
> index 3394ae2d1300..83640fef05d2 100644
> --- a/arch/arm64/boot/dts/qcom/sa8775p.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sa8775p.dtsi
> @@ -7,6 +7,7 @@
>  #include <dt-bindings/interconnect/qcom,icc.h>
>  #include <dt-bindings/interrupt-controller/arm-gic.h>
>  #include <dt-bindings/clock/qcom,rpmh.h>
> +#include <dt-bindings/clock/qcom,sa8775p-camcc.h>
>  #include <dt-bindings/clock/qcom,sa8775p-dispcc.h>
>  #include <dt-bindings/clock/qcom,sa8775p-gcc.h>
>  #include <dt-bindings/clock/qcom,sa8775p-gpucc.h>
> @@ -3796,6 +3797,192 @@ videocc: clock-controller@...0000 {
>  			#power-domain-cells = <1>;
>  		};
>  
> +		camss: isp@...a000 {
> +			compatible = "qcom,sa8775p-camss";
> +
> +			reg = <0x0 0xac7a000 0x0 0x0f01>,
> +			      <0x0 0xac7c000 0x0 0x0f01>,
> +			      <0x0 0xac84000 0x0 0x0f01>,
> +			      <0x0 0xac88000 0x0 0x0f01>,
> +			      <0x0 0xac8c000 0x0 0x0f01>,
> +			      <0x0 0xac90000 0x0 0x0f01>,
> +			      <0x0 0xac94000 0x0 0x0f01>,
These I think should begin 0x1000 earlier and as a result be 0x1000

longer
I also believe this is an off-by-one.. there's nothing past a certain
register in there, but 0xf00 is what I believe makes more sense here

[...]

> +				 <&camcc CAM_CC_CSI3PHYTIMER_CLK>,
> +				 <&camcc CAM_CC_CSID_CSIPHY_RX_CLK>,
> +				 <&gcc   GCC_CAMERA_HF_AXI_CLK>,
> +				 <&gcc   GCC_CAMERA_SF_AXI_CLK>,

Please don't forcefully align these

[...]

> +			interconnects = <&gem_noc MASTER_APPSS_PROC QCOM_ICC_TAG_ACTIVE_ONLY
> +					 &config_noc SLAVE_CAMERA_CFG QCOM_ICC_TAG_ACTIVE_ONLY>,
> +					<&mmss_noc MASTER_CAMNOC_HF QCOM_ICC_TAG_ALWAYS
> +					 &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ALWAYS>,
> +					<&mmss_noc MASTER_CAMNOC_SF QCOM_ICC_TAG_ACTIVE_ONLY
> +					 &mc_virt SLAVE_EBI1 QCOM_ICC_TAG_ACTIVE_ONLY>;

The last one should probably be always-on, given we're doing all
voting on the APPS RSC as of right now

otherwise looks reasonable

Konrad