linux-kernel - Re: [PATCH v2 2/4] arm64: dts: qcom: sm6350: Add camera clock controller

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Message-ID: <7456978a-47ce-2e8d-e030-2917da992c34@linaro.org>
Date:   Fri, 27 Jan 2023 14:56:46 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bryan O'Donoghue <pure.logic@...us-software.ie>,
        Luca Weiss <luca.weiss@...rphone.com>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/4] arm64: dts: qcom: sm6350: Add camera clock
 controller



On 27.01.2023 14:54, Bryan O'Donoghue wrote:
> On 27/01/2023 13:11, Luca Weiss wrote:
>>> Doh I meant to say a power-domain to an mmcx a la
>>>
>>> power-domains = <&rpmhpd SM8250_MMCX>;
>>> required-opps = <&rpmhpd_opp_low_svs>;
>>>
>>> TITAN_TOP should be in your cci and camss dt nodes.
>> Okay, that makes more sense.
>>
>> What I don't quite understand is why sm8250 only has MMCX listed there
>> since downstream has both vdd_mx-supply = <&VDD_MX_LEVEL> and
>> vdd_mm-supply = <&VDD_MMCX_LEVEL> and both "supplies" are used for
>> different clocks using .vdd_class
> 
> power-domains = <&rpmhpd SM8250_MMCX>; == MMCX_LEVEL required for camcc
> power-domains = <&camcc TITAN_TOP_GDSC>; required for cci/camss
> 
> now that you ask the question about MX_LEVEL you're making me doubt we have a 100% complete representation upstream TB perfectly honest, warrants a deep dive..
> 
> I just remember that on 8250 we tripped over MMCX not being switched on when - display I think was switched off.
There's no MMCX on 6350 and MX is a parent of CX, so if we just stick
CX here and add the lowest level to required-opps and add corresponding
PM ops to the clk driver, it'll all be taken care of!

Konrad

> 
> ---
> bod
>