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pinctrl: support gpio request deferred probing

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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>
This commit is contained in:
Dong Aisheng 2012-04-25 19:38:13 +08:00 committed by Linus Walleij
parent 5b3aa5f7c6
commit 4650b7cbea
1 changed files with 4 additions and 3 deletions
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7
drivers/pinctrl/core.c
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@ -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 */