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serial: mctrl-gpio: simplify init routine

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Instead of ignoring errors returned by devm_gpiod_get_index use
devm_gpiod_get_index_optional which results in slightly more strict
error handling which is good.

Also use the fourth parameter to devm_gpiod_get_index_optional to be
able to drop the explicit direction setting.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Uwe Kleine-König 2015-02-12 15:24:42 +01:00 committed by Greg Kroah-Hartman
parent 9e9f079c56
commit 1d267ea653
1 changed files with 11 additions and 18 deletions
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29
drivers/tty/serial/serial_mctrl_gpio.c
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@ -94,27 +94,20 @@ struct mctrl_gpios *mctrl_gpio_init(struct device *dev, unsigned int idx)
return ERR_PTR(-ENOMEM);
for (i = 0; i < UART_GPIO_MAX; i++) {
gpios->gpio[i] = devm_gpiod_get_index(dev,
mctrl_gpios_desc[i].name,
idx);
/*
* The GPIOs are maybe not all filled,
* this is not an error.
*/
if (IS_ERR_OR_NULL(gpios->gpio[i]))
continue;
enum gpiod_flags flags;
if (mctrl_gpios_desc[i].dir_out)
err = gpiod_direction_output(gpios->gpio[i], 0);
flags = GPIOD_OUT_LOW;
else
err = gpiod_direction_input(gpios->gpio[i]);
if (err) {
dev_dbg(dev, "Unable to set direction for %s GPIO",
mctrl_gpios_desc[i].name);
devm_gpiod_put(dev, gpios->gpio[i]);
gpios->gpio[i] = NULL;
}
flags = GPIOD_IN;
gpios->gpio[i] =
devm_gpiod_get_index_optional(dev,
mctrl_gpios_desc[i].name,
idx, flags);
if (IS_ERR(gpios->gpio[i]))
return PTR_ERR(gpios->gpio[i]);
}
return gpios;