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SubjectRe: [PATCH V2 2/3] pinctrl: allow concurrent gpio and mux function ownership of pins
On Tue, Mar 6, 2012 at 1:22 AM, Stephen Warren <> wrote:

> Per recent updates to Documentation/gpio.txt, gpiolib drivers should
> inform pinctrl when a GPIO is requested. pinctrl then marks that pin as
> in-use for that GPIO function.
> When an SoC muxes pins in a group, it's quite possible for the group to
> contain e.g. 6 pins, but only 4 of them actually be needed by the HW
> module that's mux'd to them. In this case, the other 2 pins could be
> used as GPIOs. However, pinctrl marks all the pins within the group as
> in-use by the selected mux function. To allow the expected gpiolib
> interaction, separate the concepts of pin ownership into two parts: One
> for the mux function and one for GPIO usage. Finally, allow those two
> ownerships to exist in parallel.
> Signed-off-by: Stephen Warren <>

Good, and 100% in accordance with earlier discussions.
Acked-by: Linus Walleij <>

Linus Walleij

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