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| author | Linus Walleij <linus.walleij@linaro.org> | 2012-04-10 10:00:38 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2012-04-18 13:53:11 +0200 |
| commit | c05127c4e2c6e7d9949347a76fd05c337bcd5e84 (patch) | |
| tree | 5b23f8a116919028317f026e3f9998dce2ffb828 /Documentation/pinctrl.txt | |
| parent | pinctrl: add some error checking for user interfaces (diff) | |
| download | linux-c05127c4e2c6e7d9949347a76fd05c337bcd5e84.tar.xz linux-c05127c4e2c6e7d9949347a76fd05c337bcd5e84.zip | |
pinctrl: implement pinctrl deferred probing
If drivers try to obtain pinctrl handles for a pin controller that
has not yet registered to the subsystem, we need to be able to
back out and retry with deferred probing. So let's return
-EPROBE_DEFER whenever this location fails. Also downgrade the
errors to info, maybe we will even set them to debug once the
deferred probing is commonplace.
Cc: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'Documentation/pinctrl.txt')
| -rw-r--r-- | Documentation/pinctrl.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/pinctrl.txt b/Documentation/pinctrl.txt index eb46b1c0b07a..4431c3e727ba 100644 --- a/Documentation/pinctrl.txt +++ b/Documentation/pinctrl.txt @@ -1043,6 +1043,11 @@ quickly poking some registers. The pins are allocated for your device when you issue the pinctrl_get() call, after this you should be able to see this in the debugfs listing of all pins. +NOTE: the pinctrl system will return -EPROBE_DEFER if it cannot find the +requested pinctrl handles, for example if the pinctrl driver has not yet +registered. Thus make sure that the error path in your driver gracefully +cleans up and is ready to retry the probing later in the startup process. + System pin control hogging ========================== |