linux-kernel - Re: [PATCH v4 09/16] gpio: support ROHM BD71815 GPOs

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Date:   Thu, 25 Mar 2021 10:35:39 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
Cc:     Matti Vaittinen <mazziesaccount@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-power@...rohmeurope.com,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v4 09/16] gpio: support ROHM BD71815 GPOs

On Wed, Mar 24, 2021 at 8:29 AM Matti Vaittinen
<matti.vaittinen@...rohmeurope.com> wrote:

> Support GPO(s) found from ROHM BD71815 power management IC. The IC has two
> GPO pins but only one is properly documented in data-sheet. The driver
> exposes by default only the documented GPO. The second GPO is connected to
> E5 pin and is marked as GND in data-sheet. Control for this undocumented
> pin can be enabled using a special DT property.
>
> This driver is derived from work by Peter Yang <yanglsh@...est-tech.com>
> although not so much of original is left.
>
> Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> ---
> Changes since v3:
>   - No changes

This looks OK to me:
Acked-by: Linus Walleij <linus.walleij@...aro.org>

It could potentially (like the other Rohm GPIO MFD PMIC drivers)
make some use of the gpio regmap library, but we have some
pending changes for that so look into it after the next merge
window.

I.e. for your TODO: look at the GPIO_REGMAP helper.

Yours,
Linus Walleij