linux-kernel - Re: [PATCH 1/3] dt-bindings: clock: Add Qualcomm SC8180X Camera clock controller

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Message-ID: <f93ad19f-be77-4bba-988e-9328c67cd761@quicinc.com>
Date: Wed, 30 Apr 2025 10:31:13 +0530
From: Satya Priya Kakitapalli <quic_skakitap@...cinc.com>
To: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        "Stephen
 Boyd" <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Konrad Dybcio
	<konradybcio@...nel.org>
CC: Ajit Pandey <quic_ajipan@...cinc.com>,
        Imran Shaik
	<quic_imrashai@...cinc.com>,
        Taniya Das <quic_tdas@...cinc.com>,
        "Jagadeesh
 Kona" <quic_jkona@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] dt-bindings: clock: Add Qualcomm SC8180X Camera clock
 controller


On 4/26/2025 7:33 PM, Vladimir Zapolskiy wrote:
> On 4/22/25 08:42, Satya Priya Kakitapalli wrote:
>> Add device tree bindings for the camera clock controller on
>> Qualcomm SC8180X platform.
>>
>> Signed-off-by: Satya Priya Kakitapalli <quic_skakitap@...cinc.com>
>> ---
>>   .../bindings/clock/qcom,sc8180x-camcc.yaml         |  65 ++++++++
>>   include/dt-bindings/clock/qcom,sc8180x-camcc.h     | 181 
>> +++++++++++++++++++++
>>   2 files changed, 246 insertions(+)
>>
>> diff --git 
>> a/Documentation/devicetree/bindings/clock/qcom,sc8180x-camcc.yaml 
>> b/Documentation/devicetree/bindings/clock/qcom,sc8180x-camcc.yaml
>> new file mode 100644
>> index 
>> 0000000000000000000000000000000000000000..b17f40ee53a3002b2942869d60773dbecd764134
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/clock/qcom,sc8180x-camcc.yaml
>> @@ -0,0 +1,65 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/clock/qcom,sc8180x-camcc.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Qualcomm Camera Clock & Reset Controller on SC8180X
>> +
>> +maintainers:
>> +  - Satya Priya Kakitapalli <quic_skakitap@...cinc.com>
>> +
>> +description: |
>> +  Qualcomm camera clock control module provides the clocks, resets and
>> +  power domains on SC8180X.
>> +
>> +  See also: include/dt-bindings/clock/qcom,sc8180x-camcc.h
>> +
>> +properties:
>> +  compatible:
>> +    const: qcom,sc8180x-camcc
>> +
>> +  clocks:
>> +    items:
>> +      - description: Board XO source
>
> From sc8180x_rpmh_clocks[] in clk/qcom/clk-rpmh.c I get that there is
> RPMH_CXO_CLK_A clock also, shall it be added to this list then?
>
> If yes, and taking into account Konrad's ask for GCC_CAMERA_AHB_CLK, it
> implies that the new dt bindings can be omitted, instead please consider
> to add the 'qcom,sc8180x-camcc' compatible into qcom,sa8775p-camcc.yaml.
>
> However still there is a difference, qcom,sa8775p-camcc and 
> qcom,qcs8300-camcc
> does not contain 'required-opps' property, it might be an omission over
> there though, please double check it. The ultimate goal would be to get
> a shorter list of different camcc dt bindings.


The RPMH_CXO_CLK_A clock is not needed for this, and "required-opps" is 
needed to keep the rail above retention, hence it is better to keep the 
separate bindings for this.


>
>> +      - description: Sleep clock source
>> +
>> +  power-domains:
>> +    maxItems: 1
>> +    description:
>> +      A phandle and PM domain specifier for the MMCX power domain.
>> +
>> +  required-opps:
>> +    maxItems: 1
>> +    description:
>> +      A phandle to an OPP node describing required MMCX performance 
>> point.
>> +
>> +allOf:
>> +  - $ref: qcom,gcc.yaml#
>> +
>> +required:
>> +  - compatible
>> +  - clocks
>> +  - power-domains
>> +  - required-opps
>> +
>> +unevaluatedProperties: false
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/clock/qcom,gcc-sc8180x.h>
>> +    #include <dt-bindings/clock/qcom,rpmh.h>
>> +    #include <dt-bindings/power/qcom-rpmpd.h>
>> +    clock-controller@...0000 {
>> +      compatible = "qcom,sc8180x-camcc";
>> +      reg = <0x0ad00000 0x20000>;
>> +      clocks = <&rpmhcc RPMH_CXO_CLK>,
>> +               <&sleep_clk>;
>> +      power-domains = <&rpmhpd SC8180X_MMCX>;
>> +      required-opps = <&rpmhpd_opp_low_svs>;
>> +
>> +      #clock-cells = <1>;
>> +      #reset-cells = <1>;
>> +      #power-domain-cells = <1>;
>> +    };
>> +...
>
> -- 
> Best wishes,
> Vladimir