On Fri, Oct 12, 2012 at 11:40 PM, Daniel Mack <[email protected]> wrote:
>> Because we wrote in Documentation/pinctrl.txt that if GPIO >> and pin control handle the same lines, they should be >> implemented in the gpio driver by calling out to pinctrl's >> extern int pinctrl_request_gpio(unsigned gpio); >> extern void pinctrl_free_gpio(unsigned gpio); >> extern int pinctrl_gpio_direction_input(unsigned gpio); >> extern int pinctrl_gpio_direction_output(unsigned gpio); > > Hmm. So how is a certain pin muxed to its GPIO function then? By calling exactly the above functions from the GPIO driver. > And how > can pullup/pulldown features be selected? So as stated in: "Drivers needing both pin control and GPIOs" This can be done in several ways, but this way is one option indeed, so that is a valid reason for having this pinctrl here. Is biasing what you need to do? > I admittedly might lack some background here, and if there's better > solution to what I want to do, I'd be happy to hear about it :) Sure, no problem we've even tried to document it :-) All I really want is that platforms have a clear idea about how and where the pins will be handled, and that if GPIO and pinctrl handle the same lines, they need to interact. Yours, Linus Walleij -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
