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

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Message-Id: <20200412013352.674506-1-aford173@gmail.com>
Date:   Sat, 11 Apr 2020 20:33:51 -0500
From:   Adam Ford <aford173@...il.com>
To:     linux-gpio@...r.kernel.org
Cc:     aford@...conembedded.com, Adam Ford <aford173@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] gpiolib: of: Improve gpiolib-of support pull up/down on expanders

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