linux-kernel - Re: [PATCH v3 11/17] pinctrl: madera: Add driver for Cirrus Logic Madera codecs

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Message-ID: <CACRpkdZNT-isP4-1boWP2WBYMahrbB3SHO9PfubKhLE+BPTHTA@mail.gmail.com>
Date:   Fri, 9 Jun 2017 11:13:34 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
Cc:     Lee Jones <lee.jones@...aro.org>, Mark Brown <broonie@...nel.org>,
        Alexandre Courbot <gnurou@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "open list:WOLFSON MICROELECTRONICS DRIVERS" 
        <patches@...nsource.wolfsonmicro.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 11/17] pinctrl: madera: Add driver for Cirrus Logic
 Madera codecs

On Fri, Jun 2, 2017 at 5:03 PM, Richard Fitzgerald
<rf@...nsource.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@...nsource.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