linux-kernel - Re: [PATCH v2 2/4] gpio: dwapb: Read GPIO base from gpio-base property

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Date:   Wed, 11 Aug 2021 16:05:07 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Lee Jones <lee.jones@...aro.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Hoan Tran <hoan@...amperecomputing.com>,
        Serge Semin <fancer.lancer@...il.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH v2 2/4] gpio: dwapb: Read GPIO base from gpio-base
 property

On Wed, Aug 11, 2021 at 02:50:46PM +0200, Linus Walleij wrote:
> On Wed, Aug 4, 2021 at 6:15 PM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> 
> > For backward compatibility with some legacy devices introduce
> > a new (*) property gpio-base to read GPIO base. This will allow
> > further cleaning up of the driver.
> >
> > *) Note, it's not new for the GPIO library since the mockup driver
> >    is using it already.
> >
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > ---
> > v2: added check to ensure that the property won't be used by FW (Serge)
> >  drivers/gpio/gpio-dwapb.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
> > index 4c7153cb646c..674e91e69cc5 100644
> > --- a/drivers/gpio/gpio-dwapb.c
> > +++ b/drivers/gpio/gpio-dwapb.c
> > @@ -584,6 +584,10 @@ static struct dwapb_platform_data *dwapb_gpio_get_pdata(struct device *dev)
> >
> >                 pp->gpio_base   = -1;
> >
> > +               /* For internal use only, new platforms mustn't exercise this */
> > +               if (is_software_node(fwnode))
> > +                       fwnode_property_read_u32(fwnode, "gpio-base", &pp->gpio_base);
> 
> You rewrite the code quicker than I can review  :D

Sorry for that :-)

> So this is elegant, I would prefer "linux,gpio-base" but the
> overall change is more important, with or without that change:

I'm okay with the either, but the thing is that gpio-base is already in use.
Perhaps in the future somebody can change both (gpio-mockup and this driver)
to use the proposed one (AFAIU we free to change it since it's not part of FW
interface).

> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Thanks!

-- 
With Best Regards,
Andy Shevchenko