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    Subject[PATCH 1/2] pinctrl: support gpio request deferred probing
    Date
    From: Dong Aisheng <dong.aisheng@linaro.org>

    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>
    ---
    drivers/pinctrl/core.c | 7 ++++---
    1 files changed, 4 insertions(+), 3 deletions(-)

    diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
    index 5cd5a5a..ea2412a 100644
    --- a/drivers/pinctrl/core.c
    +++ b/drivers/pinctrl/core.c
    @@ -276,7 +276,8 @@ 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,
    @@ -296,7 +297,7 @@ static int pinctrl_get_device_gpio_range(unsigned gpio,
    }
    }

    - return -EINVAL;
    + return -EPROBE_DEFER;
    }

    /**
    @@ -382,7 +383,7 @@ 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 */
    --
    1.7.0.4



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