gpio_set_debounce return value specification
From: Brendan Moran
Date: Thu Jul 21 2011 - 16:53:16 EST
Regarding gpio_set_debounce, declared in include/linux/gpio.h, defined in drivers/gpio/gpiolib.c
The return value for gpio_set_debounce isn't clearly specified. The current use of the return value appears to be 0 on success, <0 on error. Because many hardware implementations allow only specific debounce intervals, the actual debounce setting after calling gpio_set_debounce is unlikely to be the argument with which it was called.
I suggest that on success, the return value should be a positive integer indicating, in microseconds, the actual debounce interval which has been applied. A value of 0 would indicate that the debounce was applied successfully, but the driver does not support this reporting.
The current code in gpiolib.c would support this without change. A documentation change to gpiolib.c and gpio.h would be necessary.
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