linux-kernel - Re: [PATCH v2 2/5] mfd: lochnagar: Add support for the Cirrus Logic Lochnagar

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Message-ID: <20181101120433.GC6425@sirena.org.uk>
Date:   Thu, 1 Nov 2018 12:04:33 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Richard Fitzgerald <rf@...nsource.cirrus.com>
Cc:     Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Lee Jones <lee.jones@...aro.org>, mturquette@...libre.com,
        sboyd@...nel.org, linus.walleij@...aro.org, robh+dt@...nel.org,
        mark.rutland@....com, lgirdwood@...il.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...nsource.cirrus.com, linux-clk@...r.kernel.org,
        linux-gpio@...r.kernel.org
Subject: Re: [PATCH v2 2/5] mfd: lochnagar: Add support for the Cirrus Logic
 Lochnagar

On Thu, Nov 01, 2018 at 11:40:01AM +0000, Richard Fitzgerald wrote:
> On 01/11/18 10:28, Charles Keepax wrote:

> > So pulling this out from earlier discussions in this thread,
> > it seems I can happily move all the child device registration
> > into device tree. I will also try this for the next version of
> > the patch, unless anyone wants to object? But it does change
> > the DT binding quite a lot as the individual sub drivers now
> > each require their own node rather than one single unified
> > Lochnagar node.

> We went through this discussion with the Madera MFD patches. I had
> originally implemented it using DT to register the child drivers and
> it was nice in some ways each driver having its own node. But Mark
> and Rob didn't like it so I went back to non-DT child registration with
> all sharing the parent MFD node. It would be nice if we could stick to
> one way of doing it so that Cirrus drivers don't flip-flop between
> different styles of DT binding.

The basic concern I have is encoding the current Linux idea of how to
split the subfunctions up into drivers into an ABI - the clocks in CODEC
drivers is the obvious example, they might want to be in the clock API
in future.  If there's a very direct mapping onto individual hardware
blocks that worries me a lot less since it's more obviously reflecting
how the hardware is designed.

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