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Date: Thu, 21 Jul 2011 13:52:56 -0700 From: "Brendan Moran" <bremoran@...adcom.com> To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: gpio_set_debounce return value specification 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. Brendan Moran -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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