linux-kernel - Re: Re: [PATCH] regmap: flat: introduce register striding to save somememories

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Date:	Wed, 30 Dec 2015 17:58:30 +0000
From:	Mark Brown <broonie@...nel.org>
To:	"lixiubo@...s.chinamobile.com" <lixiubo@...s.chinamobile.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Re: [PATCH] regmap: flat: introduce register striding to save
 somememories

On Fri, Dec 18, 2015 at 04:59:38PM +0800, lixiubo@...s.chinamobile.com wrote:

> > I think we'll need to continue supporting non power of two strides so
> > an unconditional conversion to shifts might be an issue - some weird DSP
> > probably does that.

> Yes, agreed. 

> IMO this won't happen to MMIO, and for the device using MMIO the
> register strides should equal to power of two. 

> Are there some cases I have met? 

DSPs exposed via I2C and SPI are the main things I'm worried about.
It's fairly common for DSPs to have unusual word sizes including things
like three bytes.

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