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authorDong Aisheng <dong.aisheng@linaro.org>2012-04-25 19:38:13 +0800
committerLinus Walleij <linus.walleij@linaro.org>2012-05-02 01:14:20 +0200
commit4650b7cbea4db73f459181f67f939b510e3a17b2 (patch)
tree45f277ce5f3b79241091914be30a5c2d1288ee1f /drivers/pinctrl/core.c
parent5b3aa5f7c6287b1a0698950a91e94546888e553b (diff)
downloadop-kernel-dev-4650b7cbea4db73f459181f67f939b510e3a17b2.zip
op-kernel-dev-4650b7cbea4db73f459181f67f939b510e3a17b2.tar.gz
pinctrl: support gpio request deferred probing
As pinctrl handles, it may be possible the pinctrl gpio ranges are still not got registered when user call pinctrl_gpio_request. Thus, add defer support for it too. Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/core.c')
-rw-r--r--drivers/pinctrl/core.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index a6386b3..c3b331b 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -291,7 +291,8 @@ pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
*
* Find the pin controller handling a certain GPIO pin from the pinspace of
* the GPIO subsystem, return the device and the matching GPIO range. Returns
- * negative if the GPIO range could not be found in any device.
+ * -EPROBE_DEFER if the GPIO range could not be found in any device since it
+ * may still have not been registered.
*/
static int pinctrl_get_device_gpio_range(unsigned gpio,
struct pinctrl_dev **outdev,
@@ -311,7 +312,7 @@ static int pinctrl_get_device_gpio_range(unsigned gpio,
}
}
- return -EINVAL;
+ return -EPROBE_DEFER;
}
/**
@@ -397,7 +398,7 @@ int pinctrl_request_gpio(unsigned gpio)
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
if (ret) {
mutex_unlock(&pinctrl_mutex);
- return -EINVAL;
+ return ret;
}
/* Convert to the pin controllers number space */
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