linux-kernel - Re: [PATCH] gpio Add my driver new id

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Message-ID: <YaqKQVV1+8ksQInA@smile.fi.intel.com>
Date:   Fri, 3 Dec 2021 23:21:05 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Richard Hsu <saraon640529@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Richard_Hsu@...edia.com.tw,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Yd_Tseng@...edia.com.tw, Cindy1_Hsu@...edia.com.tw,
        Andrew_Su@...edia.com.tw
Subject: Re: [PATCH] gpio Add my driver new id

On Fri, Dec 03, 2021 at 11:15:46AM +0100, Bartosz Golaszewski wrote:
> On Fri, Dec 3, 2021 at 10:26 AM Richard Hsu <saraon640529@...il.com> wrote:

Thanks, Bart, for pointing out to this.

> >  #define PT_TOTAL_GPIO 8
> > +#define PT_TOTAL_GPIO_EX 24

...

> > +       struct acpi_device *acpi_dev;
> > +       acpi_handle handle = ACPI_HANDLE(dev);

> > -       if (!ACPI_COMPANION(dev)) {
> > +       if (acpi_bus_get_device(handle, &acpi_dev)) {

What you are doing here is open coding the ACPI_COMPANION().
But see below.

...

> > +       if (!strncmp(acpi_dev_name(acpi_dev), "AMDIF031", 8))
> > +               pt_gpio->gc.ngpio = PT_TOTAL_GPIO_EX;
> > +       else
> > +               pt_gpio->gc.ngpio = PT_TOTAL_GPIO;

Instead of doing this...

> >  static const struct acpi_device_id pt_gpio_acpi_match[] = {
> >         { "AMDF030", 0 },
> >         { "AMDIF030", 0 },
> > +       { "AMDIF031", 0 },

Just use .driver_data here and if needed in the other ID tables and then simply
retrieve it (w/o any conditions) in the code above:

	pt_gpio->gc.ngpio = (uintptr_t)device_get_match_data(dev);

> >         { },
> >  };

> Please Cc Andy next time on any GPIO stuff related to ACPI. I'll let
> him comment on the code. Your commit message must be more descriptive
> - the title should say "gpio: <driver name>: <do this and that>".
> Please also add a commit message explaining what the code does in
> detail.

-- 
With Best Regards,
Andy Shevchenko