linux-kernel - Re: [PATCH 4/5] clk: qcom: Add camera clock controller driver for SM8150

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Message-ID: <35a7ad40-aaf4-476e-8582-b83bac284881@linaro.org>
Date: Fri, 8 Mar 2024 10:59:30 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: "Satya Priya Kakitapalli (Temp)" <quic_skakitap@...cinc.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Abhishek Sahu <absahu@...eaurora.org>,
 Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>
Cc: Stephen Boyd <sboyd@...eaurora.org>, linux-arm-msm@...r.kernel.org,
 linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org, Ajit Pandey <quic_ajipan@...cinc.com>,
 Imran Shaik <quic_imrashai@...cinc.com>, Taniya Das <quic_tdas@...cinc.com>,
 Jagadeesh Kona <quic_jkona@...cinc.com>
Subject: Re: [PATCH 4/5] clk: qcom: Add camera clock controller driver for
 SM8150

On 08/03/2024 10:58, Bryan O'Donoghue wrote:
> On 08/03/2024 10:46, Satya Priya Kakitapalli (Temp) wrote:
>>>
>>> Not if you mark it critical
>>>
>>
>> Marking the clock as critical keeps the associated power domain 
>> always-on which impacts power. For this reason we are not using 
>> CLK_IS_CRITICAL and instead making them always on from probe.
> 
> How does the clock do anything _useful_ if the power-domain gets 
> switched off ?
> 
> ---
> bod

i.e. the clock can't be running "always-on" if it has no power..

---
bod