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i2c: pca954x: improve usage of gpiod API

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Since 39b2bbe3d7 (gpio: add flags argument to gpiod_get*() functions)
which appeared in v3.17-rc1, the gpiod_get* functions take an additional
parameter that allows to specify direction and initial value for
outputs.

Also there is an *_optional variant that serves well here.  The sematics
is slightly changed here by using it. Now if a reset gpio is specified
and getting hold on it fails, pca954x_probe fails, too.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Uwe Kleine-König 2015-02-17 10:12:08 +01:00 committed by Wolfram Sang
parent fef220da43
commit 58b59e0f24
1 changed files with 3 additions and 3 deletions
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6
drivers/i2c/muxes/i2c-mux-pca954x.c
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@ -204,9 +204,9 @@ static int pca954x_probe(struct i2c_client *client,
i2c_set_clientdata(client, data);
/* Get the mux out of reset if a reset GPIO is specified. */
gpio = devm_gpiod_get(&client->dev, "reset");
if (!IS_ERR(gpio))
gpiod_direction_output(gpio, 0);
gpio = devm_gpiod_get_optional(&client->dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(gpio))
return PTR_ERR(gpio);
/* Write the mux register at addr to verify
* that the mux is in fact present. This also