linux-kernel - Re: [PATCH RFT 01/20] clk: qcom: smd-rpm: Add .is

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Date:   Mon, 6 Mar 2023 02:27:07 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Shawn Guo <shawn.guo@...aro.org>
Subject: Re: [PATCH RFT 01/20] clk: qcom: smd-rpm: Add .is_enabled hook

On 06/03/2023 02:21, Dmitry Baryshkov wrote:
> On Sat, 4 Mar 2023 at 15:27, Konrad Dybcio <konrad.dybcio@...aro.org> wrote:
>>
>> From: Shawn Guo <shawn.guo@...aro.org>
>>
>> The RPM clock enabling state can be found with 'enabled' in struct
>> clk_smd_rpm.  Add .is_enabled hook so that clk_summary in debugfs can
>> show a correct enabling state for RPM clocks.
> 
> There is a small problem with this patch: now if the bootloader leaves
> a clock enabled for some reason and there are no Linux users for that
> clock, clk_disable_unused_subtree() will consider this clock disabled
> and will not disable the clock on its own.
> And at this stage of smd-rpm platforms support I think we better off
> finding missing clock consumers rather than depending on the
> bootloader for some of the setup.

Argh. And then I understood that without the patch clk_core_is_enabled 
will shortcut to core->enable_count, which also means that the clock 
will be skipped.

But now I have another question: since r->enabled follows 
core->enabled_count, can we get rid of r->enabled and switch to 
core->enable_count? This might mean adding clk_software_is_enabled() 
function for your patch.

-- 
With best wishes
Dmitry