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

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Message-ID: <8f62d6ec611e646449ed6fbba197c6f1@agner.ch>
Date:	Mon, 28 Mar 2016 23:11:09 -0700
From:	Stefan Agner <stefan@...er.ch>
To:	Alexander Stein <alexander.stein@...tec-electronic.com>
Cc:	Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] regmap: mmio: Fix value endianness selection

On 2016-03-28 23:10, Alexander Stein wrote:
> 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?

Yes, DCU as well as DSPI is attached little endian on Vybrid (aka.
vf610).

--
Stefan