On Monday 09 February 2009, Joonyoung Shim wrote: > but, it doesn't return actual value of the pin if twl4030 GPIO pin is output. So it would seem that these GPIOs don't support bidirectional usage. Documentation/gpio.txt includes: >>> However, note that not all platforms can >>> read the value of output pins; those that can't >>> should always return zero. Which is exactly what's happening here, it seems... > For example, the GPIO13 pin of twl4030 is configured as an output > using gpio_direction_output() and assigns the GPIO's value to 1 > using gpio_set_value_cansleep(), the result of "# cat /sys/kernel/debug/gpio" > reports to me as follows. > > GPIOs 192-209, platform/twl4030_gpio, twl4030, can sleep: > gpio-205 (keyled ) out lo > > but it should have reported "hi" instead of "lo". > -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
