Messages in this thread | | | Date | Mon, 20 Feb 2012 07:39:41 +0000 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH 1/2] Documentation/gpio.txt: Explain expected pinctrl interaction |
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On Sun, Feb 19, 2012 at 11:27:42PM -0700, Stephen Warren wrote: > Update gpio.txt based on recent discussions regarding interaction with the > pinctrl subsystem. > > Previously, gpio_request() was described as explicitly not performing any > required mux setup operations etc. > > Now, gpio_request() is explicitly as explicitly performing any required mux > setup operations where possible. In the case it isn't, platform code is > required to have set up any required muxing or other configuration prior to > gpio_request() being called, in order to maintain the same semantics.
So what if you need to have the pin as a GPIO, manipulate it as a GPIO, and then hand it off to a special function, and then take it back as a GPIO before you shut the special function down ?
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