Re: [RFC PATCH 07/10] dt-bindings: rtc: Add bindings for Netronix embedded controller RTC

[Andreas Kemnade]

On Sun, 21 Jun 2020 02:02:20 +0200
Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx> wrote:

> Hi,
> 
> On 21/06/2020 00:42:18+0200, Jonathan Neuschäfer wrote:
> > The Netronix EC implements an RTC with the following functionality:
> > 
> > - Calendar-based time keeping with single-second resolution
> > - Automatic power-on with single-minute resolution
> > - Alarm at single-second resolution
> > 
> > This binding only supports timekeeping for now.
> > 
> > Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@xxxxxxx>
> > ---
> >  .../bindings/mfd/netronix,ntxec.yaml          |  7 +++++
> >  .../bindings/rtc/netronix,ntxec-rtc.yaml      | 27 +++++++++++++++++++
> >  2 files changed, 34 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/rtc/netronix,ntxec-rtc.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml b/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
> > index 6562c41c5a9a9..f6a32f46f47bb 100644
> > --- a/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
> > +++ b/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
> > @@ -34,6 +34,9 @@ properties:
> >    pwm:
> >      $ref: ../pwm/netronix,ntxec-pwm.yaml
> > 
> > +  rtc:
> > +    $ref: ../rtc/netronix,ntxec-rtc.yaml
> > +  
> 
> Shouldn't the node simply be documented here?
> 
> Also, do you really need a compatible string to be able to proe the
> driver? What are the chances that you'll get a similar EC without an
> RTC?
> 
Tolino Shine 2 HD has the mentioned EC but the vendor kernel does not use
its RTC (not checked whether it is present or functional).
As a key for grepping in the vendor sources: 
gptNtxHwCfg->m_val.bPCB = 0x50

Tolino Shine 3  and Kobo Clara HD do not have that EC.

Regrads,
Andreas