linux-kernel - Re: [PATCH v3 12/12] i2c: qcom-geni: Enable I2C on SA8255p Qualcomm platforms

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Message-ID: <bc743f55-75ae-42d6-82bf-593ad2359134@oss.qualcomm.com>
Date: Wed, 4 Feb 2026 11:13:50 +0530
From: Praveen Talari <praveen.talari@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Mukesh Kumar Savaliya <mukesh.savaliya@....qualcomm.com>,
        Viken Dadhaniya <viken.dadhaniya@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, bryan.odonoghue@...aro.org,
        dmitry.baryshkov@....qualcomm.com, bjorn.andersson@....qualcomm.com
Cc: prasad.sodagudi@....qualcomm.com, quic_vtanuku@...cinc.com,
        aniket.randive@....qualcomm.com, chandana.chiluveru@....qualcomm.com
Subject: Re: [PATCH v3 12/12] i2c: qcom-geni: Enable I2C on SA8255p Qualcomm
 platforms

Hi Konrad,

On 2/2/2026 8:23 PM, Konrad Dybcio wrote:
> On 1/30/26 5:44 PM, Praveen Talari wrote:
>> Hi Konrad,
>>
>> On 1/30/2026 6:04 PM, Konrad Dybcio wrote:
>>>> +static const struct geni_i2c_desc sa8255p_geni_i2c = {
>>>> +    .resources_init = geni_se_domain_attach,
>>>> +    .set_rate = geni_se_set_perf_opp,
>>> This means, on SCMI devices you won't don't the vote on the POWER
>>> domain (or PERF for that matter) and switch the GPIOs to a _suspend
>>> state - is that by design?
>>
>> With PD_FLAG_DEV_LINK_ON enabled, every pm_runtime_get_sync() or pm_runtime_put_sync() on the device triggers a corresponding genpd on/off transition. These transitions are translated into SCMI power‑domain commands, allowing the firmware (GearVM) to perform the actual enable/disable sequencing.
> 
> Does that handle the >1 pd case too? If so, then all good

Yes,

Thanks,
Praveen Talari
> 
> Konrad