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

[Sergei Ianovich <ynvich@gmail.com>]

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=A0This =
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.

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.

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