linux-kernel - Re: [PATCH 1/2] dt-bindings: rtc: Add Spreadtrum SC27xx RTC documentation

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Date:   Wed, 8 Nov 2017 06:12:24 +0100
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Baolin Wang <baolin.wang@...aro.org>
Cc:     Baolin Wang <baolin.wang@...eadtrum.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-rtc@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH 1/2] dt-bindings: rtc: Add Spreadtrum SC27xx RTC
 documentation

On 08/11/2017 at 13:02:59 +0800, Baolin Wang wrote:
> Hi Alexandre,
> 
> On 8 November 2017 at 11:15, Alexandre Belloni
> <alexandre.belloni@...e-electrons.com> wrote:
> > Hi,
> >
> > On 07/11/2017 at 19:34:07 +0800, Baolin Wang wrote:
> >> This patch adds the binding documentation for Spreadtrum SC27xx series
> >> RTC device.
> >>
> >> Signed-off-by: Baolin Wang <baolin.wang@...eadtrum.com>
> >> ---
> >>  .../devicetree/bindings/rtc/sprd,sc27xx-rtc.txt    |   16 ++++++++++++++++
> >>  1 file changed, 16 insertions(+)
> >>  create mode 100644 Documentation/devicetree/bindings/rtc/sprd,sc27xx-rtc.txt
> >>
> >> diff --git a/Documentation/devicetree/bindings/rtc/sprd,sc27xx-rtc.txt b/Documentation/devicetree/bindings/rtc/sprd,sc27xx-rtc.txt
> >> new file mode 100644
> >> index 0000000..971d3a2
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/rtc/sprd,sc27xx-rtc.txt
> >> @@ -0,0 +1,16 @@
> >> +Spreadtrum SC27xx Real Time Clock
> >> +
> >> +Required properties:
> >> +- compatible: should be "sprd,sc27xx-rtc".
> >
> > Don't use wildcards in a compatible, use a specific chip model. later
> > chips may or may not be compatible with that one.
> 
> Our Spreadtrum SC27xx series PMICs contain SC2720, SC2721, SC2723,
> SC2730 and SC2731. They all integrate the same RTC IP, so I think it
> will be better to use "sc27xx" string. Our PMIC driver also used the
> "sprd,sc27xx-rtc" sting which has been merged into Lee's MFD next
> tree.
> 

And at some point it time, you'll have sc2750 or 2770 with a different
rtc and everything will get confusing.

I should have been copied on the mfd series if you wanted to avoid that.
Anyway, I'm pretty sure Rob will have the same opinion.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com