linux-kernel - Re: [PATCH 1/2] clk: qocm: add qcom_cc_map

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Message-ID: <CAA8EJpqOD-JKGCJiC7yAkiG3oAOEbHQ-_aCmDiP5HdeEVZm8fw@mail.gmail.com>
Date: Thu, 11 Jul 2024 02:32:18 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Stephen Boyd <sboyd@...nel.org>
Cc: Bjorn Andersson <andersson@...nel.org>, Michael Turquette <mturquette@...libre.com>, 
	Rob Clark <robdclark@...il.com>, linux-arm-msm@...r.kernel.org, 
	linux-clk@...r.kernel.org, freedreno@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] clk: qocm: add qcom_cc_map_norequest

On Tue, 9 Jul 2024 at 01:30, Stephen Boyd <sboyd@...nel.org> wrote:
>
> Quoting Dmitry Baryshkov (2024-06-27 22:20:22)
> > The GPU clock controllers use memory region that is a part of the GMU's
> > memory region. Add qcom_cc_map_norequest() to be used by GPUCC, so that
> > GPU driver can use devm_ioremap_resource for GMU resources.
>
> Why does GMU map the gpu clk controller? Does it use those registers? We
> don't want to allow two different drivers to map the same region because
> then they don't coordinate and write over things.

It's not that GMU maps gpu CC separately. It looks more like gpucc is
a part of the GMU address space. I think GMU manages some of the
clocks or GDSCs directly.

-- 
With best wishes
Dmitry