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

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Date:   Wed, 8 Nov 2017 13:02:59 +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

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.

>
>> +- reg: address offset of rtc register.
>> +- interrupt-parent: phandle for the interrupt controller.
>> +- interrupts: rtc alarm interrupt.
>> +
>> +Example:
>> +
>> +     rtc: rtc@280 {
>
> The rtc: alias is probably useless

Yes, I will remove it.

>
>> +             compatible = "sprd,sc27xx-rtc";
>> +             reg = <0x280>;
>> +             interrupt-parent = <&pmic>;
>> +             interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
>> +     };
>
> I would include the parent MFD node too.

OK. Thanks for your comments.

-- 
Baolin Wang
Best Regards