linux-kernel - Re: [PATCH] clk: qcom: Specify LE device endianness

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Date:	Fri, 20 Nov 2015 13:14:52 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Mike Turquette <mturquette@...libre.com>
Cc:	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, Simon Arlott <simon@...e.lp0.eu>,
	Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH] clk: qcom: Specify LE device endianness

On 11/09, Stephen Boyd wrote:
> All these clock controllers are little endian devices, but so far
> we've been relying on the regmap mmio bus handling this for us
> without explicitly stating that fact. After commit 4a98da2164cf
> (regmap-mmio: Use native endianness for read/write, 2015-10-29),
> the regmap mmio bus will read/write with the __raw_*() IO
> accessors, instead of using the readl/writel() APIs that do
> proper byte swapping for little endian devices.
> 
> So if we're running on a big endian processor and haven't
> specified the endianness explicitly in the regmap config or in
> DT, we're going to switch from doing little endian byte swapping
> to big endian accesses without byte swapping, leading to some
> confusing results. On my apq8074 dragonboard, this causes the
> device to fail to boot as we access the clock controller with
> big endian IO accesses even though the device is little endian.
> 
> Specify the endianness explicitly so that the regmap core
> properly byte swaps the accesses for us.
> 
> Reported-by: Kevin Hilman <khilman@...aro.org>
> Cc: Simon Arlott <simon@...e.lp0.eu>
> Cc: Mark Brown <broonie@...nel.org>
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> ---

Applied to clk-next

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