[rtc-linux] Re: [PATCH 0/4] support control with using GPIO lines

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

[Adding Mark]

On 10/04/2016 at 18:23:01 +0300, Sergei Ianovich wrote :
> On Sun, 2016-04-10 at 17:12 +0200, Alexandre Belloni wrote:
> > Hi,
> >=20
> > On 10/04/2016 at 23:59:22 +0900, Akinobu Mita wrote :
> > >=20
> > > This series adds support access to DS1302 with GPIO lines.
> > >=20
> > > Recently rtc-ds1302 is rewritten using SPI 3wire mode.=C2=A0=C2=A0Thi=
s adds
> > > another platform driver using GPIO while supporting both modes.
> > >=20
> > > Thie series first fixes two problems I found while tesing, secondly
> > > introduces the abstraction layer for the register access which
> > > enables
> > > to share the most code between spi and platform driver, and adds
> > > the platform driver using GPIO.
> > >=20
> > Well, isn't spi-gpio fitting for that use case? I'd like to avoid
> > open
> > coding gpio bitbanging in the driver.
>=20
> No, unfortunately. I've investigated this possibility for my platform.
> spi-gpio doesn't support LSB-first and 3-wire options. Adding support
> there is a very big change. The best way to add GPIO support is to
> create spi-gpio-3wire with LSB-first support.

Mark, do you have nay opinion on that?


--=20
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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