linux-kernel - Re: regmap: mmio: regression in pre-v4.6-rc1

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Message-ID: <2546674.kDegJfs12v@ws-stein>
Date:	Wed, 23 Mar 2016 10:43:08 +0100
From:	Alexander Stein <alexander.stein@...tec-electronic.com>
To:	linux-kernel@...r.kernel.org
Cc:	Mark Brown <broonie@...nel.org>
Subject: Re: regmap: mmio: regression in pre-v4.6-rc1

On Wednesday 23 March 2016 09:48:42, Alexander Stein wrote:
> I'm currently trying to get PCIe working on LS1021A (little-endian ARM). For link-detection I need access to a syscon perpheral (SCFG) which is attched to CPU as big-endian.
> The corresponding DT part is:
> 
> 		scfg: scfg@...0000 {
> 			compatible = "fsl,ls1021a-scfg", "syscon";
> 			reg = <0x0 0x1570000 0x0 0x10000>;
> 			big-endian;
> 		};
> 
> Based on current linus's master (a24e3d414e59ac765, "Merge branch 'akpm' (patches from Andrew)") I noticed the access is actually done as little-endian.
> I could track it down to commit 922a9f936e40001f ("regmap: mmio: Convert to regmap_bus and fix accessor usage"). Reverting it, the access is fine now and I get my PCIe link.

Just for the records, this also affects spi-fsl-dspi which is also attached in big-endian.

Best regards,
Alexander