linux-kernel - [PATCH] gpio: omap: handle pin config bias flags

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Date:   Fri, 10 Jul 2020 00:34:01 +0200
From:   Drew Fustini <drew@...gleboard.org>
To:     Tony Lindgren <tony@...mide.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Grygorii Strashko <grygorii.strashko@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Kevin Hilman <khilman@...nel.org>, linux-omap@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Drew Fustini <drew@...gleboard.org>
Subject: [PATCH] gpio: omap: handle pin config bias flags

Modify omap_gpio_set_config() to handle pin config bias flags by calling
gpiochip_generic_config().

The pin group for the gpio line must have the corresponding pinconf
properties:

PIN_CONFIG_BIAS_PULL_UP requires "pinctrl-single,bias-pullup"
PIN_CONFIG_BIAS_PULL_DOWN requires "pinctrl-single,bias-pulldown"

This is necessary for pcs_pinconf_set() to find the requested bias
parameter in the PIN_MAP_TYPE_CONFIGS_GROUP pinctrl map.

Signed-off-by: Drew Fustini <drew@...gleboard.org>
---
 drivers/gpio/gpio-omap.c | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index b8e2ecc3eade..a471a152f318 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -896,12 +896,25 @@ static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset,
 				unsigned long config)
 {
 	u32 debounce;
+	int ret;
 
-	if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE)
-		return -ENOTSUPP;
+	if ((pinconf_to_config_param(config) == PIN_CONFIG_BIAS_DISABLE) ||
+	    (pinconf_to_config_param(config) == PIN_CONFIG_BIAS_PULL_UP) ||
+	    (pinconf_to_config_param(config) == PIN_CONFIG_BIAS_PULL_DOWN))
+	{
+		ret = gpiochip_generic_config(chip, offset, config);
+	}
+	else if (pinconf_to_config_param(config) == PIN_CONFIG_INPUT_DEBOUNCE)
+	{
+		debounce = pinconf_to_config_argument(config);
+		ret = omap_gpio_debounce(chip, offset, debounce);
+	}
+	else
+	{
+		ret = -ENOTSUPP;
+	}
 
-	debounce = pinconf_to_config_argument(config);
-	return omap_gpio_debounce(chip, offset, debounce);
+	return ret;
 }
 
 static void omap_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-- 
2.25.1