linux-kernel - Re: [PATCH 1/2] gpiolib: of: Improve gpiolib-of support pull up/down on expanders

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Message-ID: <CAMpxmJUA=-AfSGLtVzhBe16q73P6kHJeX6W_kYuG6W3AQ=3A+g@mail.gmail.com>
Date:   Wed, 15 Apr 2020 13:23:35 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Adam Ford <aford173@...il.com>
Cc:     linux-gpio <linux-gpio@...r.kernel.org>, aford@...conembedded.com,
        Linus Walleij <linus.walleij@...aro.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] gpiolib: of: Improve gpiolib-of support pull up/down
 on expanders

niedz., 12 kwi 2020 o 03:34 Adam Ford <aford173@...il.com> napisał(a):
>
> When using GPIO expanders attached to I2C ports, their set_config function
> needs to be passed a config setting which contains options to enable pull
> up or pull down bias feature.  In order to set this config properly,
> the gpio parser needs to handle GPIO_PULL_UP and GPIO_PULL_DOWN.
>
> This patch enables the flags corresponding to GPIO_PULL_UP and
> GPIO_PULL_DOWN.
>
> Signed-off-by: Adam Ford <aford173@...il.com>
>
> diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
> index c6d30f73df07..bf17afb1f66d 100644
> --- a/drivers/gpio/gpiolib-of.c
> +++ b/drivers/gpio/gpiolib-of.c
> @@ -344,6 +344,12 @@ struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
>         if (transitory)
>                 lflags |= GPIO_TRANSITORY;
>
> +       if (flags & OF_GPIO_PULL_UP)
> +               lflags |= GPIO_PULL_UP;
> +
> +       if (flags & OF_GPIO_PULL_DOWN)
> +               lflags |= GPIO_PULL_DOWN;
> +
>         ret = gpiod_configure_flags(desc, propname, lflags, dflags);
>         if (ret < 0) {
>                 gpiod_put(desc);
> @@ -585,6 +591,10 @@ static struct gpio_desc *of_parse_own_gpio(struct device_node *np,
>                 *lflags |= GPIO_ACTIVE_LOW;
>         if (xlate_flags & OF_GPIO_TRANSITORY)
>                 *lflags |= GPIO_TRANSITORY;
> +       if (xlate_flags & OF_GPIO_PULL_UP)
> +               *lflags |= GPIO_PULL_UP;
> +       if (xlate_flags & OF_GPIO_PULL_DOWN)
> +               *lflags |= GPIO_PULL_DOWN;
>
>         if (of_property_read_bool(np, "input"))
>                 *dflags |= GPIOD_IN;
> --
> 2.25.1
>

Patch applied, thanks!

Bart