[PATCH] gpio: pxa: fix legacy non pinctrl aware builds

From: Robert Jarzmik
Date: Sun Mar 27 2016 - 15:13:20 EST

In legacy pxa builds, ie. non device-tree and platform-data only builds,
pinctrl is not yet available. As a consequence, the pinctrl gpio
direction change function is a stub, returning always success.

In the current state, the gpio driver direction function believes the
pinctrl direction change was successful, and exits without actually
changing the gpio direction.

This patch changes the logic :
- if the pinctrl direction function fails, gpio direction will report
that failure
- if the pinctrl direction function succeeds, gpio direction is changed
by the gpio driver anyway.
This is sub optimal in the pinctrl aware case, as the gpio direction
will be changed twice: once by pinctrl function and another time by
the gpio direction function.

Yet it should be acceptable in this form, as this is functional for all
pxa platforms (device-tree and platform-data), and moreover changing a
gpio direction is very very seldom, usually in machine initialization,
seldom in drivers probe, and an exception for ac97 reset bug.

Fixes: a770d946371e ("gpio: pxa: add pin control gpio direction and request")
Reported-by: Guenter Roeck <guenter@xxxxxxxxxxxx>
Signed-off-by: Robert Jarzmik <robert.jarzmik@xxxxxxx>
drivers/gpio/gpio-pxa.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-pxa.c b/drivers/gpio/gpio-pxa.c
index b2b7b78664b8..76ac906b4d78 100644
--- a/drivers/gpio/gpio-pxa.c
+++ b/drivers/gpio/gpio-pxa.c
@@ -283,8 +283,8 @@ static int pxa_gpio_direction_output(struct gpio_chip *chip,
writel_relaxed(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET));

ret = pinctrl_gpio_direction_output(chip->base + offset);
- if (!ret)
- return 0;
+ if (ret)
+ return ret;

spin_lock_irqsave(&gpio_lock, flags);