linux-kernel - Re: [PATCH v2 2/2] mailbox: qcom: Add MSM8939 APCS support

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Message-ID: <CABb+yY3T=LkcjarGbZ4KEY_JS5R9iV-X_21gX_VheqsWBUHGDg@mail.gmail.com>
Date:   Mon, 21 Jun 2021 09:49:40 -0500
From:   Jassi Brar <jassisinghbrar@...il.com>
To:     Shawn Guo <shawn.guo@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Sivaprakash Murugesan <sivaprak@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Benjamin Li <benl@...areup.com>,
        Devicetree List <devicetree@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] mailbox: qcom: Add MSM8939 APCS support

On Mon, Jun 21, 2021 at 1:33 AM Shawn Guo <shawn.guo@...aro.org> wrote:
>
> On Sun, Jun 20, 2021 at 11:27:49PM -0500, Jassi Brar wrote:
> > On Sun, May 23, 2021 at 1:00 AM Shawn Guo <shawn.guo@...aro.org> wrote:
> > >
> > > On Mon, May 03, 2021 at 04:13:34PM +0800, Shawn Guo wrote:
> > > > MSM8939 has 3 APCS instances for Cluster0 (little cores), Cluster1 (big
> > > > cores) and CCI (Cache Coherent Interconnect).  Although only APCS of
> > > > Cluster0 and Cluster1 have IPC bits, each of 3 APCS has A53PLL clock
> > > > control bits.  That said, we need to register 3 'qcom-apcs-msm8916-clk'
> > > > devices to instantiate all 3 clocks.  Let's use PLATFORM_DEVID_AUTO
> > > > rather than PLATFORM_DEVID_NONE for platform_device_register_data()
> > > > call.  Otherwise, the second A53PLL clock registration will fail due
> > > > to duplicate device name.
> > > >
> > > > [    0.519657] sysfs: cannot create duplicate filename '/bus/platform/devices/qcom-apcs-msm8916-clk'
> > > > ...
> > > > [    0.661158] qcom_apcs_ipc b111000.mailbox: failed to register APCS clk
> > > >
> > > > Signed-off-by: Shawn Guo <shawn.guo@...aro.org>
> > > > Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> > >
> > > Hi Jassi,
> > >
> > > Any comment on this patch?
> > >
> > 1)  I was not on the CC list, so I don't have this patch in my mbox.
>
> That's strange.  The patch series was sent with your address
> <jassisinghbrar@...il.com> on "To:" field.  And that can be seen on
> patch archive [1].
>
Sorry, yes you are right. But I still can't find it in my inbox (and
neither in spam).... perhaps I nuked it by mistake. anyways...

> > 2)  Shouldn't this patch be broken into a fix and an enablement patch?
>
> MSM8939 is the only platform that I know has multiple clusters and uses
> APCS driver.  So the change becomes a fix only when MSM8939 is enabled.
> But if you prefer to separate the change, I will do so.
>
Yes, please.

thanks.