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

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Message-ID: <e9d3c0b8-2abd-47a5-b594-83f0288d95ba@oss.qualcomm.com>
Date: Fri, 30 Jan 2026 22:14:12 +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 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.

Thanks,
Praveen.