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

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Date:	Wed, 23 Mar 2016 09:48:42 +0100
From:	Alexander Stein <alexander.stein@...tec-electronic.com>
To:	linux-kernel@...r.kernel.org
Cc:	Mark Brown <broonie@...nel.org>
Subject: regmap: mmio: regression in pre-v4.6-rc1

Hi,

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.

Best regards,
Alexander