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Message-Id: <200902111816.41569.david-b@pacbell.net> Date: Wed, 11 Feb 2009 18:16:41 -0800 From: David Brownell <david-b@...bell.net> To: Joonyoung Shim <dofmind@...il.com> Cc: Tony Lindgren <tony@...mide.com>, linux-arm-kernel@...ts.arm.linux.org.uk, linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org Subject: Re: [PATCH] twl4030-gpio: Fix getting the value of the TWL4030 GPIO output pin 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-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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