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

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Message-ID: <CAMz4kuK2yOJEGEaJRutyU-8qEM_mO+JvOPnDhtjouHTk80Qphw@mail.gmail.com>
Date:   Wed, 8 Nov 2017 13:33:45 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Alexandre Belloni <alexandre.belloni@...e-electrons.com>
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 8 November 2017 at 13:12, Alexandre Belloni
<alexandre.belloni@...e-electrons.com> wrote:
> 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.

Yes, I can understand your concern. OK, I will change to a specific
chip name in next version. Thanks.

>
> 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.
>
-- 
Baolin.wang
Best Regards