linux-kernel - Re: [PATCH 1/5] mfd: lochnagar: Add support for the Cirrus Logic Lochnagar

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Date:   Thu, 6 Sep 2018 15:46:12 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        patches@...nsource.cirrus.com
Subject: Re: [PATCH 1/5] mfd: lochnagar: Add support for the Cirrus Logic Lochnagar

On Wed, Sep 5, 2018 at 12:41 PM Charles Keepax
<ckeepax@...nsource.cirrus.com> wrote:

> From: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
>
> Lochnagar is an evaluation and development board for Cirrus
> Logic Smart CODEC and Amp devices. It allows the connection of
> most Cirrus Logic devices on mini-cards, as well as allowing
> connection of various application processor systems to provide a
> full evaluation platform.  Audio system topology, clocking and
> power can all be controlled through the Lochnagar, allowing the
> device under test to be used in a variety of possible use cases.
>
> As the Lochnagar is a fairly complex device this MFD driver
> allows the drivers for the various features to be bound
> in. Initially clocking, regulator and pinctrl will be added as
> these are necessary to configure the system. But in time at least
> audio and voltage/current monitoring will also be added.
>
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>

It's a bit confusing, maybe you can clear it up:
it appears to be an I2C device, so when you say this is a
"development board" is there something like a board
controller that is accessed over I2C and this is what the
driver really probes to, not the board per se?

I guess jamming this card into the I2C slot of any other
system (would work fine with a 96Boards LS connector
as it seems, actually)  also involves connecting some
I2S or similar on the side for high-datarate traffic?

This driver seems to only concern itself with the I2C
board controller per se, not the board is that right?

Yours,
Linus Walleij