linux-kernel - Re: [PATCH V4 4/4] arm64: dts: qcom: sm8550: Add camera clock controller

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Message-ID: <a3652f67-3e48-db33-1dd2-c17abdbdae41@quicinc.com>
Date:   Wed, 14 Jun 2023 17:26:09 +0530
From:   Jagadeesh Kona <quic_jkona@...cinc.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
CC:     Bjorn Andersson <andersson@...nel.org>,
        Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Taniya Das <quic_tdas@...cinc.com>,
        "Satya Priya Kakitapalli" <quic_skakitap@...cinc.com>,
        Imran Shaik <quic_imrashai@...cinc.com>,
        Ajit Pandey <quic_ajipan@...cinc.com>
Subject: Re: [PATCH V4 4/4] arm64: dts: qcom: sm8550: Add camera clock
 controller



On 6/9/2023 6:22 PM, Konrad Dybcio wrote:
> 
> 
> On 9.06.2023 13:50, Jagadeesh Kona wrote:
>> Add device node for camera clock controller on Qualcomm
>> SM8550 platform.
>>
>> Signed-off-by: Taniya Das <quic_tdas@...cinc.com>
>> Signed-off-by: Jagadeesh Kona <quic_jkona@...cinc.com>
>> ---
>> Changes since V3:
>>   - No changes
>> Changes since V2:
>>   - No changes
>> Changes since V1:
>>   - Padded non-zero address part to 8 hex digits
>>
>>   arch/arm64/boot/dts/qcom/sm8550.dtsi | 15 +++++++++++++++
>>   1 file changed, 15 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sm8550.dtsi b/arch/arm64/boot/dts/qcom/sm8550.dtsi
>> index 75cd374943eb..4d2d610fc66a 100644
>> --- a/arch/arm64/boot/dts/qcom/sm8550.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sm8550.dtsi
>> @@ -5,6 +5,7 @@
>>   
>>   #include <dt-bindings/clock/qcom,rpmh.h>
>>   #include <dt-bindings/clock/qcom,sm8450-videocc.h>
>> +#include <dt-bindings/clock/qcom,sm8550-camcc.h>
>>   #include <dt-bindings/clock/qcom,sm8550-gcc.h>
>>   #include <dt-bindings/clock/qcom,sm8550-gpucc.h>
>>   #include <dt-bindings/clock/qcom,sm8550-tcsr.h>
>> @@ -2419,6 +2420,20 @@ videocc: clock-controller@...0000 {
>>   			#power-domain-cells = <1>;
>>   		};
>>   
>> +		camcc: clock-controller@...0000 {
>> +			compatible = "qcom,sm8550-camcc";
>> +			reg = <0 0x0ade0000 0 0x20000>;
>> +			clocks = <&gcc GCC_CAMERA_AHB_CLK>,
>> +				 <&bi_tcxo_div2>,
>> +				 <&bi_tcxo_ao_div2>,
>> +				 <&sleep_clk>;
>> +			power-domains = <&rpmhpd SM8550_MMCX>;
> I see that both MMCX ("mmcx.lvl") and MXC ("mxc.lvl") (and MX, FWIW)
> are consumed on msm-5.15, with the latter one powering camcc PLLs..
> 
> How are they related? Is that resolved internally or does it need
> manual intervention?
> 
> Konrad

These are just different voltage rails, camcc clocks are powered by MMCX 
rail and camcc pll's are powered by MXC rail. Consumer drivers need to 
take care of voting on these rails properly based on the frequency of 
clocks requested.

Thanks,
Jagadeesh

>> +			required-opps = <&rpmhpd_opp_low_svs>;
>> +			#clock-cells = <1>;
>> +			#reset-cells = <1>;
>> +			#power-domain-cells = <1>;
>> +		};
>> +
>>   		mdss: display-subsystem@...0000 {
>>   			compatible = "qcom,sm8550-mdss";
>>   			reg = <0 0x0ae00000 0 0x1000>;