linux-kernel - RE: [PATCH] regmap: Add REGMAP_ENDIAN

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Message-ID: <791ba45eb211460b9530099b77637257@BY2PR03MB505.namprd03.prod.outlook.com>
Date:	Fri, 28 Mar 2014 06:24:33 +0000
From:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
To:	Mark Brown <broonie@...nel.org>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] regmap: Add REGMAP_ENDIAN_SWAP support for values.

> Subject: Re: [PATCH] regmap: Add REGMAP_ENDIAN_SWAP support for values.
> 
> On Thu, Mar 27, 2014 at 04:17:39PM +0800, Xiubo Li wrote:
> 
> > And using the REGMAP_ENDIAN_BIG and REGMAP_ENDIAN_LITTLE will make
> > the driver a bit more complex, and also the usage of it.
> 
> What's the complexity here?

Well, maybe it not as complex as it likes, just relatively:

For some drivers that may support the following cases:

For the DT node:

CPU        Dev        LE/BE property need ?
----------------------------------------------
LE         LE         No
LE         BE         'big-endian' property
BE         BE         No
BE         LE         'little-endian' property

The driver will adapt to this too.

Thanks :)

Best Regards,
Xiubo


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