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

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Date:   Mon, 21 Jun 2021 14:33:10 +0800
From:   Shawn Guo <shawn.guo@...aro.org>
To:     Jassi Brar <jassisinghbrar@...il.com>
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 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].

> 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.

Shawn 

[1] https://lore.kernel.org/patchwork/patch/1420808/