linux-kernel - Re: [PATCH] regmap: mmio: Fix value endianness selection

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Message-ID: <2467072.5nNY07Ee9z@ws-stein>
Date:	Tue, 29 Mar 2016 08:10:18 +0200
From:	Alexander Stein <alexander.stein@...tec-electronic.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Stefan Agner <stefan@...er.ch>
Subject: Re: [PATCH] regmap: mmio: Fix value endianness selection

On Friday 25 March 2016 11:24:59, Mark Brown wrote:
> On Wed, Mar 23, 2016 at 03:20:46PM +0100, Alexander Stein wrote:
> > The difference in those drivers is that syscon manually sets
> > config.val_format_endian before calling regmap_init_mmio.
> > spi-fsl-dspi does not. I guess this driver relies on this configuration
> > being done in regmap_get_val_endian. But this is never reached because
> > after setting
> Does this IP exist in configurations where it is anything other than big
> endian?  If not then this probably shouldn't be in DT.

AFAIK it is included once or twice in the VFxxx series. CC'ed Stefan Agner for 
confirmation.
Stefan: Is the DCU on VFxxx attached little-endian, e.g. no byte swapping 
needed when accessing the periphery?

Best regards,
Alexander