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| author | David Brownell <david-b@pacbell.net> | 2007-05-16 22:11:13 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-17 05:23:05 -0700 |
| commit | 83c6590cb83d3106df12fee36ac2a261951b8c88 (patch) | |
| tree | 8906e0f3366959e2595d26d263ab32922958743b /Documentation/gpio.txt | |
| parent | 621e59a771f310358ade8f14cb745d5d5f1c410e (diff) | |
| download | lwn-83c6590cb83d3106df12fee36ac2a261951b8c88.tar.gz lwn-83c6590cb83d3106df12fee36ac2a261951b8c88.zip | |
gpio interface loosens call restrictions
Loosen gpio_{request,free}() and gpio_direction_{in,out}put() call context
restrictions slightly, so a common idiom is no longer an error: board init
code setting up spinlock-safe GPIOs before tasking is enabled.
The issue was caught by some paranoid code with might_sleep() checks. The
legacy platform-specific GPIO interfaces stick to spinlock-safe GPIOs, so this
change reflects current implementations and won't break anything.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/gpio.txt')
| -rw-r--r-- | Documentation/gpio.txt | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt index e8be0abb346c..36af58eba136 100644 --- a/Documentation/gpio.txt +++ b/Documentation/gpio.txt @@ -111,7 +111,9 @@ setting up a platform_device using the GPIO, is mark its direction: The return value is zero for success, else a negative errno. It should be checked, since the get/set calls don't have error returns and since -misconfiguration is possible. (These calls could sleep.) +misconfiguration is possible. You should normally issue these calls from +a task context. However, for spinlock-safe GPIOs it's OK to use them +before tasking is enabled, as part of early board setup. For output GPIOs, the value provided becomes the initial output value. This helps avoid signal glitching during system startup. @@ -197,7 +199,9 @@ However, many platforms don't currently support this mechanism. Passing invalid GPIO numbers to gpio_request() will fail, as will requesting GPIOs that have already been claimed with that call. The return value of -gpio_request() must be checked. (These calls could sleep.) +gpio_request() must be checked. You should normally issue these calls from +a task context. However, for spinlock-safe GPIOs it's OK to request GPIOs +before tasking is enabled, as part of early board setup. These calls serve two basic purposes. One is marking the signals which are actually in use as GPIOs, for better diagnostics; systems may have |