linux-kernel - Re: [PATCH 3/5] regulator: da9062: add voltage selection gpio support

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Message-ID: <CACRpkdYAjj+EuF+iu4fKjt2Cviu8V+U66HnQThawwU58UGRUzQ@mail.gmail.com>
Date:   Fri, 4 Oct 2019 21:41:12 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Marco Felsch <m.felsch@...gutronix.de>
Cc:     Support Opensource <support.opensource@...semi.com>,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, stwiss.opensource@...semi.com,
        Sascha Hauer <kernel@...gutronix.de>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] regulator: da9062: add voltage selection gpio support

On Tue, Sep 17, 2019 at 2:43 PM Marco Felsch <m.felsch@...gutronix.de> wrote:

> +       /*
> +        * We only must ensure that the gpio device is probed before the
> +        * regulator driver so no need to store the reference global. Luckily
> +        * devm_* releases the gpio upon a unbound action.
> +        */
> +       gpi = devm_gpiod_get_from_of_node(cfg->dev, np, prop, 0, GPIOD_IN |
> +                                         GPIOD_FLAGS_BIT_NONEXCLUSIVE, label);

Do you really need the GPIOD_FLAGS_BIT_NONEXCLUSIVE flag here?
I don't think so, but describe what usecase you have that warrants this
being claimed twice. Normally that is just needed when you let the
regulator core handle enablement of a regulator over GPIO, i.e.
ena_gpiod in struct regulator_config.

> +       /* We need the local number */
> +       nr = da9062_gpio_get_hwgpio(gpi);

If you really need this we should add a public API to gpiolib and not
create custom APIs.

Just make a patch adding

int gpiod_to_offset(struct gpio_desc *d);

to the public gpiolib API in include/linux/gpio/consumer.h

and add the code in gpiolib.c to do this trick.

Yours,
Linus Walleij