[alsa-devel] [PATCH v2 10/18] pinctrl: madera: Add driver for Cirrus Logic Madera codecs

[Linus Walleij]

On Mon, Apr 24, 2017 at 6:08 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 V1:
> - dt binding moved to separate patch
> - moved all source into a subdirectory drivers/pinctrl/cirrus
> - split chip-specific tables into separate files
> - codec-specific build options are now selected from MFD
> - print useful information from madera_pin_dbg_show()
> - added gpio_set_direciton / gpio_request_enable / gpio_disable_free functions
> - added strict mode so GPIO and other functions are exclusive
> - replace #ifdefs with if (IS_ENABLED(...)) in probe
> - fixed bug reading registers in madera_pin_conf_get()

Reviewed-by: Linus Walleij <linus.walleij at linaro.org>

I guess you will apply this through MFD, so waiting for Lee to
pick it up. Alternatively I can apply it after the MFD core parts
are upstream.

Yours,
Linus Walleij