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

Linus Walleij
2018-09-06T13:46:28Z

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

> From: Charles Keepax <ckeepax@opensource.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@opensource.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