[alsa-devel] [PATCH v3 11/17] pinctrl: madera: Add driver for Cirrus Logic Madera codecs

[Linus Walleij]

On Fri, Jun 2, 2017 at 5:03 PM, Richard Fitzgerald
<rf at opensource.wolfsonmicro.com> wrote:

> These codecs have a variable number of I/O lines each of which
> is individually selectable to a wide range of possible functions.
>
> The functionality is slightly different from the traditional muxed
> GPIO since most of the functions can be mapped to any pin (and even
> the same function to multiple pins). Most pins have a dedicated
> "alternate" function that is only available on that pin. The
> alternate functions are usually a group of signals, though it is
> not always necessary to enable the full group, depending on the
> alternate function and how it is to be used. The mapping between
> alternate functions and GPIO pins varies between codecs depending
> on the number of alternate functions and available pins.
>
> Note on the Kconfig options:
> The formula "default y if..." is used for PINCTRL_MADERA so that its
> select options will be processed, allowing us to group selects for
> pinctrl into the pinctrl Kconfig where they logically belong instead
> of accumulating under the parent MFD Kconfig.
>
> Signed-off-by: Richard Fitzgerald <rf at opensource.wolfsonmicro.com>
> ---
> Changes since V2:
> - Removed unused drive strength settings to tidy the code
> - Use devm_pinctrl_register_and_init() to avoid the problems with
>   pinctrl_register()
> - Replaced a couple of hardcoded masks with the defined constant

There is a Kconfig problem as pointed out by the build robot.

Apart from that this looks like merge material, and we need to
think about a merge strategy like with the GPIO patch, once
the MFD portions are ready.

Yours,
Linus Walleij