From: Shawn Guo <shawn.guo@linaro.org>
To: Stephen Boyd <sboyd@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Sivaprakash Murugesan <sivaprak@codeaurora.org>,
Benjamin Li <benl@squareup.com>,
devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-clk@vger.kernel.org
Subject: Re: [PATCH 1/5] clk: qcom: apcs-msm8916: Flag a53mux instead of a53pll as critical
Date: Tue, 29 Jun 2021 10:37:22 +0800 [thread overview]
Message-ID: <20210629023721.GA32336@dragon> (raw)
In-Reply-To: <162484006132.3259633.9518693749627795895@swboyd.mtv.corp.google.com>
On Sun, Jun 27, 2021 at 05:27:41PM -0700, Stephen Boyd wrote:
> Quoting Shawn Guo (2021-05-03 22:28:40)
> > The clock source for MSM8916 cpu cores is like below.
> >
> > |\
> > a53pll --------| \ a53mux +------+
> > | |------------| cpus |
> > gpll0_vote --------| / +------+
> > |/
> >
> > So clock a53mux rather than a53pll is actually the clock source of cpu
> > cores. It makes more sense to flag a53mux rather than a53pll as
> > critical, since a53pll could be irrelevant if a53mux switches its parent
> > clock to be gpll0_vote.
>
> Can you add some more detail here? I think the idea is to mark the mux
> as critical so that either a53pll or gpll0_vote is kept enabled, but
> only if they're used by the CPU. That isn't very clear from the commit
> text. Otherwise it seems OK.
Sure. I will rewrite the commit log.
Shawn
next prev parent reply other threads:[~2021-06-29 2:37 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-04 5:28 [PATCH 0/5] Add MSM8939 APCS/A53PLL clock support Shawn Guo
2021-05-04 5:28 ` [PATCH 1/5] clk: qcom: apcs-msm8916: Flag a53mux instead of a53pll as critical Shawn Guo
2021-06-28 0:27 ` Stephen Boyd
2021-06-29 2:37 ` Shawn Guo [this message]
2021-05-04 5:28 ` [PATCH 2/5] dt-bindings: clock: update qcom,a53pll bindings for MSM8939 support Shawn Guo
2021-05-06 20:27 ` Rob Herring
2021-05-07 0:18 ` Shawn Guo
2021-05-04 5:28 ` [PATCH 3/5] clk: qcom: apcs-msm8916: Retrieve clock name from DT Shawn Guo
2021-06-28 0:28 ` Stephen Boyd
2021-06-29 13:36 ` Shawn Guo
2021-06-29 15:57 ` Bjorn Andersson
2021-06-29 20:23 ` Stephen Boyd
2021-06-29 20:39 ` Bjorn Andersson
2021-05-04 5:28 ` [PATCH 4/5] clk: qcom: a53-pll: Pass freq_tbl via match data Shawn Guo
2021-05-04 5:28 ` [PATCH 5/5] clk: qcom: a53-pll: Add MSM8939 a53pll clocks Shawn Guo
2021-06-28 0:24 ` Stephen Boyd
2021-06-21 6:37 ` [PATCH 0/5] Add MSM8939 APCS/A53PLL clock support Shawn Guo
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