linux-kernel - Re: [PATCH 5/7] ARM: dts: qcom: msm8226: Add CPU frequency scaling support

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Date: Thu, 20 Jun 2024 23:27:19 +0200
From: Luca Weiss <luca@...aweiss.eu>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
 Jassi Brar <jassisinghbrar@...il.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 linux-clk@...r.kernel.org
Subject:
 Re: [PATCH 5/7] ARM: dts: qcom: msm8226: Add CPU frequency scaling support

On Donnerstag, 20. Juni 2024 22:54:37 MESZ Dmitry Baryshkov wrote:
> On Wed, Jun 19, 2024 at 11:02:49PM GMT, Luca Weiss wrote:
> > Add a node for the a7pll with its frequencies. With this we can use the
> > apcs-kpss-global driver for the apcs node and use the apcs to scale the
> > CPU frequency according to the opp-table.
> > 
> > At the same time unfortunately we need to provide the gcc node xo_board
> > instead of the XO via rpmcc since otherwise we'll have a circular
> > dependency between apcs, gcc and the rpm.
> 
> But it should be fine, isn't it? Clock controllers can handle orphaned
> clocks.
> 
> The xo_board is really a hack and should eventually be removed.

I can check again what happened but pretty sure there were some issues with
this still being rpmcc.

But there were also some clock issues with apcs-as-syscon usage (that's
the main reason for my influx of patches regarding this topic), so maybe
with the apcs one solved that one's also fine.

I'll check again!

> 
> > 
> > Signed-off-by: Luca Weiss <luca@...aweiss.eu>
> > ---
> 
>