Re: [rtc-linux] [PATCH v2 2/4] dt/bindings: Add bindings for Micro Crystal rv8803

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On Fri, Jun 24, 2016 at 12:48 AM, Alexandre Belloni
<alexandre.belloni@xxxxxxxxxxxxxxxxxx> wrote:
> On 22/06/2016 at 08:42:20 +0200, Dirk Behme wrote :
>> From: Oleksij Rempel <fixed-term.Oleksij.Rempel@xxxxxxxxxxxx>
>>
>> ... and Epson RX8900 real time clock
>>
>> Signed-off-by: Oleksij Rempel <fixed-term.Oleksij.Rempel@xxxxxxxxxxxx>
>> Cc: devicetree@xxxxxxxxxxxxxxx
>> ---
>>  .../devicetree/bindings/rtc/epson,rx8900.txt       | 22 ++++++++++++++++++++++
>>  1 file changed, 22 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/rtc/epson,rx8900.txt
>>
>> diff --git a/Documentation/devicetree/bindings/rtc/epson,rx8900.txt b/Documentation/devicetree/bindings/rtc/epson,rx8900.txt
>> new file mode 100644
>> index 0000000..3f61e51
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/rtc/epson,rx8900.txt
>> @@ -0,0 +1,22 @@
>> +Real Time Clock driver for:
>> +  - Epson RX8900
>> +  - Micro Crystal rv8803
>> +
>> +Required properties:
>> +- compatible: should be: "microcrystal,rv8803" or "epson,rx8900"
>> +- reg : the I2C address of the device for I2C
>> +
>> +Optional properties:
>> +- epson,vdet-disable : boolean, if present will disable voltage detector.
>> +  Should be set if no backup battery is used.
>
> I guess we need to make that one generic. I would use
> voltage-detection-disable.
>
> Andrey, can you use that one instead of
> dallas,disable-oscillator-stop-flag ?
>

AFAIU from reading RX8900 datasheet, it has two power rails main and a
backup one, so setting this property disables circuitry responsible
for detecting main power rail failure and switching to a backup one.

DS1341 has only one power rail and setting
"dallas,disable-oscillator-stop-flag" will disable circuitry
responsible for detection of failure of the oscillator ticking its
internal clock.

IMHO, those functionalities don't have much in common and using the
same property would be confusing for users of that binding on DS1341,
but it's a boolean so there's not technical reason I couldn't.

Thanks,
Andrey Smirnov
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