linux-kernel - Re: [PATCH] regmap: slimbus: add support to raw read/writes

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Message-ID: <20180705150857.GA6227@sirena.org.uk>
Date:   Thu, 5 Jul 2018 16:08:57 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        alsa-devel@...a-project.org
Subject: Re: [PATCH] regmap: slimbus: add support to raw read/writes

On Thu, Jul 05, 2018 at 12:37:00PM +0100, Srinivas Kandagatla wrote:

> SLIMbus supports upto 16 bytes in value management messages,
> so add support to raw read/writes upto 16 bytes.

That's not what raw access is.  It's unmediated access to existing
registers, not some other thing with completely different register sizes
which you can't see through the register map.  The intended use is for
things like fast firmware downloads.  If it's not part of the register
map we shouldn't be going through regmap to get to it.

> Also useful for paged register access on SLIMbus interfaced codecs.

That needs a bunch more explanation...  in what way does raw access
relate to paged register maps?

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