[RFC PATH 2/2] gpio: starfive-jh7100: Add StarFive JH7100 GPIO driver

[Drew Fustini]

On Thu, Jul 01, 2021 at 08:39:40AM +0200, Michael Walle wrote:
> Hi Drew,
> 
> Am 2021-07-01 02:20, schrieb Drew Fustini:
> > Add GPIO driver for the StarFive JH7100 SoC [1] used on the
> > BeagleV Starlight JH7100 board [2].
> > 
> > [1] https://github.com/starfive-tech/beaglev_doc/
> > [2] https://github.com/beagleboard/beaglev-starlight
> > 
> > Signed-off-by: Emil Renner Berthing <kernel at esmil.dk>
> > Signed-off-by: Huan Feng <huan.feng at starfivetech.com>
> > Signed-off-by: Drew Fustini <drew at beagleboard.org>
> 
> Could this driver use GPIO_REGMAP and REGMAP_IRQ? See
> drivers/gpio/gpio-sl28cpld.c for an example.
> 
> -michael

Thank you for the suggestion.  I am not familiar with GPIO_REGMAP and
REGMAP_IRQ so I will read about it.  Is the advantage is that is helps
to reduce code duplication by using an abstraction?

I did notice that the gpio-sifive.c driver used regmap_update_bits() and
regmap_write().

I suppose that is better than writel_relaxed() and iowrite32() which
this RFC driver does?

thanks,
drew