[rtc-linux] Re: [PATCH v2 2/2] rtc: ds1302: support control with using GPIO lines

[Alexandre Belloni <alexandre.belloni@free-electrons.com>]

On 28/06/2016 at 15:57:04 -0500, Rob Herring wrote :
> On Mon, Jun 27, 2016 at 08:19:22PM +0900, Akinobu Mita wrote:
> > This adds support control with GPIO lines connected to the DS1302
> > which can communicate with three wires.
> > 
> > Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
> > Cc: Sergey Yanovich <ynvich@gmail.com>
> > Cc: Alessandro Zummo <a.zummo@towertech.it>
> > Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
> > ---
> >  .../devicetree/bindings/rtc/maxim-ds1302.txt       |  13 +
> >  drivers/rtc/Kconfig                                |  17 +-
> >  drivers/rtc/rtc-ds1302.c                           | 320 ++++++++++++++++++++-
> >  3 files changed, 331 insertions(+), 19 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/rtc/maxim-ds1302.txt b/Documentation/devicetree/bindings/rtc/maxim-ds1302.txt
> > index ba470c5..d489753 100644
> > --- a/Documentation/devicetree/bindings/rtc/maxim-ds1302.txt
> > +++ b/Documentation/devicetree/bindings/rtc/maxim-ds1302.txt
> > @@ -27,6 +27,12 @@ Required SPI properties:
> >  - spi-cs-high: DS-1302 has active high chip select line. This is
> >    required unless inverted in hardware.
> >  
> > +Required properties when using GPIO lines:
> > +
> > +- gpio-ce: GPIO connected to CE pin
> > +- gpio-io: GPIO connected to I/O pin
> > +- gpio-reset: GPIO connected to SCLK pin
> > +
> 
> IIRC, we got rid of the direct gpio bit-banging in this driver (or a 
> similar one) and replaced it with SPI GPIO driver. We should do that 
> here.
> 

Well, the fact is that it is not actually SPI but microwire which has
different timings and we didn't reach a conclusion yet with Mark.

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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