linux-kernel - Re: [PATCH v3 2/5] gpio: gxp: Add HPE GXP GPIO

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Message-ID: <CAHp75VcCJoTSPFOcQ5FKTi=EuUTvwzxus1n+nuowPxa0WagQeQ@mail.gmail.com>
Date:   Thu, 8 Jun 2023 20:15:09 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     "Hawkins, Nick" <nick.hawkins@....com>
Cc:     "Verdun, Jean-Marie" <verdun@....com>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "brgl@...ev.pl" <brgl@...ev.pl>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "jdelvare@...e.com" <jdelvare@...e.com>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>
Subject: Re: [PATCH v3 2/5] gpio: gxp: Add HPE GXP GPIO

On Thu, Jun 8, 2023 at 5:58 PM Hawkins, Nick <nick.hawkins@....com> wrote:
> > > Is there any documents available describing how regmap_gpio
> > > populates the GPIO lines? Does it automatically go through and add lines
> > > for each successful regmap_read and bits per byte?
>
> > Nope, it assumes one bit per register or something different if xlate
> > callback is defined. This is my understanding. That said, it might be
> > that this is a limitation which does not allow you to switch to that
> > library.
>
> Thank you for this feedback. After exploring the gpio_regmap it seems
> it does not fit my needs. Some of the GPIOs are a combination of
> several bits in a byte. For instance the Health LED or Identify LED have
> more than 2 states. If acceptable I believe the gxp-gpio-pl.c file should
> not use the gpio_regmap.

Yes, just mention this reasoning in the cover letter.

-- 
With Best Regards,
Andy Shevchenko