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Date:   Thu, 3 May 2018 22:53:51 +0200
From:   Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Amelie Delaunay <amelie.delaunay@...com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-rtc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] dt-bindings: rtc: update stm32-rtc documentation for
 st,syscfg property

Amelie,

On 26/04/2018 21:58:03-0500, Rob Herring wrote:
> On Thu, Apr 19, 2018 at 03:21:42PM +0200, Amelie Delaunay wrote:
> > RTC driver should not be aware of the PWR registers offset and bits
> > position. Furthermore, we can imagine that Disable Backup Protection (DBP)
> > relative register and bit mask could change depending on the SoC. So this
> > patch moves st,syscfg property from single pwrcfg phandle to pwrcfg
> > phandle/offset/mask triplet.
> > 
> > Signed-off-by: Amelie Delaunay <amelie.delaunay@...com>
> > ---
> >  Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt | 10 ++++++----
> >  1 file changed, 6 insertions(+), 4 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
> > index a66692a..00f8b5d 100644
> > --- a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
> > +++ b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.txt
> > @@ -14,8 +14,10 @@ Required properties:
> >      It is required only on stm32h7.
> >  - interrupt-parent: phandle for the interrupt controller.
> >  - interrupts: rtc alarm interrupt.
> > -- st,syscfg: phandle for pwrcfg, mandatory to disable/enable backup domain
> > -  (RTC registers) write protection.
> > +- st,syscfg: phandle/offset/mask triplet. The phandle to pwrcfg used to
> > +  access control register at offset, and change the dbp (Disable Backup
> > +  Protection) bit represented by the mask, mandatory to disable/enable backup
> > +  domain (RTC registers) write protection.
> 
> It's fine to add this, but you are breaking compatibility in the driver 
> with existing DTBs by requiring these new fields.
> 

I'm fine with that change but I would like confirmation that this has
been well thought. Maybe Maxime or Alexandre could give their ack.

-- 
Alexandre Belloni, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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