linux-kernel - Re: [PATCH V2 RESEND 6/6] arm64: dts: qcom: sm8650: Add video and camera clock controllers

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Date: Wed, 3 Apr 2024 12:46:19 +0530
From: Jagadeesh Kona <quic_jkona@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konrad.dybcio@...aro.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>,
        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>,
        Ajit Pandey <quic_ajipan@...cinc.com>,
        Imran Shaik
	<quic_imrashai@...cinc.com>
Subject: Re: [PATCH V2 RESEND 6/6] arm64: dts: qcom: sm8650: Add video and
 camera clock controllers



On 3/25/2024 11:38 AM, Jagadeesh Kona wrote:
> 
> 
> On 3/21/2024 6:43 PM, Dmitry Baryshkov wrote:
>> On Thu, 21 Mar 2024 at 11:27, Jagadeesh Kona <quic_jkona@...cinc.com> 
>> wrote:
>>>
>>> Add device nodes for video and camera clock controllers on Qualcomm
>>> SM8650 platform.
>>>
>>> Signed-off-by: Jagadeesh Kona <quic_jkona@...cinc.com>
>>> ---
>>>   arch/arm64/boot/dts/qcom/sm8650.dtsi | 28 ++++++++++++++++++++++++++++
>>>   1 file changed, 28 insertions(+)
>>>
>>> diff --git a/arch/arm64/boot/dts/qcom/sm8650.dtsi 
>>> b/arch/arm64/boot/dts/qcom/sm8650.dtsi
>>> index 32c0a7b9aded..d862aa6be824 100644
>>> --- a/arch/arm64/boot/dts/qcom/sm8650.dtsi
>>> +++ b/arch/arm64/boot/dts/qcom/sm8650.dtsi
>>> @@ -4,6 +4,8 @@
>>>    */
>>>
>>>   #include <dt-bindings/clock/qcom,rpmh.h>
>>> +#include <dt-bindings/clock/qcom,sm8450-videocc.h>
>>> +#include <dt-bindings/clock/qcom,sm8650-camcc.h>
>>>   #include <dt-bindings/clock/qcom,sm8650-dispcc.h>
>>>   #include <dt-bindings/clock/qcom,sm8650-gcc.h>
>>>   #include <dt-bindings/clock/qcom,sm8650-gpucc.h>
>>> @@ -3110,6 +3112,32 @@ opp-202000000 {
>>>                          };
>>>                  };
>>>
>>> +               videocc: clock-controller@...0000 {
>>> +                       compatible = "qcom,sm8650-videocc";
>>> +                       reg = <0 0x0aaf0000 0 0x10000>;
>>> +                       clocks = <&bi_tcxo_div2>,
>>> +                                <&gcc GCC_VIDEO_AHB_CLK>;
>>> +                       power-domains = <&rpmhpd RPMHPD_MMCX>;
>>> +                       required-opps = <&rpmhpd_opp_low_svs>;
>>
>> The required-opps should no longer be necessary.
>>
> 
> Sure, will check and remove this if not required.


I checked further on this and without required-opps, if there is no vote 
on the power-domain & its peer from any other consumers, when runtime 
get is called on device, it enables the power domain just at the minimum 
non-zero level. But in some cases, the minimum non-zero level of 
power-domain could be just retention and is not sufficient for clock 
controller to operate, hence required-opps property is needed to specify 
the minimum level required on power-domain for this clock controller.

Thanks,
Jagadeesh

> 
>>> +                       #clock-cells = <1>;
>>> +                       #reset-cells = <1>;
>>> +                       #power-domain-cells = <1>;
>>> +               };
>>> +
>>> +               camcc: clock-controller@...0000 {
>>> +                       compatible = "qcom,sm8650-camcc";
>>> +                       reg = <0 0x0ade0000 0 0x20000>;
>>> +                       clocks = <&gcc GCC_CAMERA_AHB_CLK>,
>>> +                                <&bi_tcxo_div2>,
>>> +                                <&bi_tcxo_ao_div2>,
>>> +                                <&sleep_clk>;
>>> +                       power-domains = <&rpmhpd RPMHPD_MMCX>;
>>> +                       required-opps = <&rpmhpd_opp_low_svs>;
>>> +                       #clock-cells = <1>;
>>> +                       #reset-cells = <1>;
>>> +                       #power-domain-cells = <1>;
>>> +               };
>>> +
>>>                  mdss: display-subsystem@...0000 {
>>>                          compatible = "qcom,sm8650-mdss";
>>>                          reg = <0 0x0ae00000 0 0x1000>;
>>> -- 
>>> 2.43.0
>>>
>>>
>>
>>