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Re: [PATCH 2/6] pinctrl: pxa: pxa2xx: add pin control skeleton

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  Re: [PATCH 2/6] pinctrl: pxa: pxa2xx: add pin control skeleton Linus Walleij <linus.walleij@linaro.org> - 2015-12-10 16:20 +0100

#1288572 — Re: [PATCH 2/6] pinctrl: pxa: pxa2xx: add pin control skeleton

On Sat, Nov 21, 2015 at 7:04 PM, Robert Jarzmik <robert.jarzmik@free.fr> wrote:

> Add a pincontrol driver for pxa2xx architecture, encompassing all pxa25x
> and pxa27x variants. This is only the pin muxing part of the driver.
>
> One specific consideration is also the memory space (MMIO), which is
> intertwined with the GPIO registers. To make things worse, the GPIO
> direction register also affect pin muxing, as it chooses the "kind" of
> pin, ie. the 4 output functions or 4 input functions.
>
> The mapping between pinctrl notions and PXA Technical Reference Manual
> is as follows :
>  - a pin is obviously a pin
>  - a group is also a pin, ie. group P101 is the pin 101
>  - a mux function is an alternate function
>    (ie. gpio-in, gpio-out, MMCLK, BTRTS, etc ...)
>
> The individual architecture (pxa27x, pxa25x) instantiate a pin control
> by providing a table of pins, each pin being provided a list of
> PXA_FUNCTION (alternate functions).
>
> Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>

Patch applied.

Yours,
Linus Walleij
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