From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kevin Hilman <khilman@kernel.org>
Subject: Re: [PATCH v3 4/5] clk: Hi6220: add stub clock driver
Date: Tue, 1 Sep 2015 17:28:03 -0700
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To: Leo Yan <leo.yan@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>, Mark Rutland <mark.rutland@arm.com>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Kumar Gala <galak@codeaurora.org>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Michael Turquette <mturquette@baylibre.com>, Stephen Boyd <sboyd@codeaurora.org>, Wei Xu <xuwei5@hisilicon.com>, Haojian Zhuang <haojian.zhuang@linaro.org>, Bintian Wang <bintian.wang@huawei.com>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>, lkml <linux-kernel@vger.kernel.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, linux-clk@vger.kernel.org, Guodong Xu <guodong.xu@linaro.org>, Jian Zhang <zhangjian001@hisilicon.com>, Zhenwei Wang <Zhenwei.wang@hisilicon.com>, Haoju Mo <mohaoju@hisilicon.com>, Dan Zhao <dan.zhao@hisilicon.com>, sunzhaosheng@hisilicon.co
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On Sun, Aug 2, 2015 at 6:13 PM, Leo Yan <leo.yan@linaro.org> wrote:
> On Hi6220, there have some clocks which can use mailbox channel to send
> messages to power controller to change frequency; this includes CPU, GPU
> and DDR clocks.
>
> For dynamic frequency scaling, firstly need write the frequency value to
> SRAM region, and then send message to mailbox to trigger power controller
> to handle this requirement. This driver will use syscon APIs to pass SRAM
> memory region and use common mailbox APIs for channels accessing.
>
> This init driver will support cpu frequency change firstly.
>
> Signed-off-by: Leo Yan <leo.yan@linaro.org>

The kernelci.org build/boot bot detected boot failures in
linux-next[1], and the failure was bisected down to this patch (landed
in linux-next as commit c1628a2c416da947f5afac615d53189250fa49cb.

I verifed that reverting this commit on top of next-20150901 gets the
hikey booting again.

Kevin

[1] http://kernelci.org/boot/hi6220-hikey/