From: jason@lakedaemon.net (Jason Cooper)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: kirkwood: of_serial: fix clock gating by removing clock-frequency
Date: Tue, 5 Feb 2013 06:13:07 -0500 [thread overview]
Message-ID: <20130205111307.GO14746@titan.lakedaemon.net> (raw)
In-Reply-To: <20130205105431.GI652@kw.sim.vm.gnt>
On Tue, Feb 05, 2013 at 11:54:31AM +0100, Simon Guinot wrote:
> On Tue, Jan 29, 2013 at 09:09:34PM +0000, Jason Cooper wrote:
> > When DT support for kirkwood was first introduced, there was no clock
> > infrastructure. As a result, we had to manually pass the
> > clock-frequency to the driver from the device node.
> >
> > Unfortunately, on kirkwood, with minimal config or all module configs,
> > clock-frequency breaks booting because of_serial doesn't consume the
> > gate_clk when clock-frequency is defined.
> >
> > The end result on kirkwood is that runit gets gated, and then the boot
> > fails when the kernel tries to write to the serial port.
> >
> > Fix the issue by removing the clock-frequency parameter from all
> > kirkwood dts files.
> >
> > Booted on dreamplug without earlyprintk and successfully logged in via
> > ttyS0.
> >
> > Reported-by: Simon Baatz <gmbnomis@gmail.com>
> > Signed-off-by: Jason Cooper <jason@lakedaemon.net>
> > ---
> > arch/arm/boot/dts/kirkwood-dns320.dts | 2 --
> > arch/arm/boot/dts/kirkwood-dns325.dts | 1 -
> > arch/arm/boot/dts/kirkwood-dockstar.dts | 1 -
> > arch/arm/boot/dts/kirkwood-dreamplug.dts | 1 -
> > arch/arm/boot/dts/kirkwood-goflexnet.dts | 1 -
> > arch/arm/boot/dts/kirkwood-ib62x0.dts | 1 -
> > arch/arm/boot/dts/kirkwood-iconnect.dts | 1 -
> > arch/arm/boot/dts/kirkwood-iomega_ix2_200.dts | 1 -
> > arch/arm/boot/dts/kirkwood-km_kirkwood.dts | 1 -
> > arch/arm/boot/dts/kirkwood-lschlv2.dts | 1 -
> > arch/arm/boot/dts/kirkwood-lsxhl.dts | 1 -
> > arch/arm/boot/dts/kirkwood-mplcec4.dts | 1 -
> > arch/arm/boot/dts/kirkwood-nsa310.dts | 1 -
> > arch/arm/boot/dts/kirkwood-openblocks_a6.dts | 2 --
> > arch/arm/boot/dts/kirkwood-topkick.dts | 1 -
> > arch/arm/boot/dts/kirkwood.dtsi | 2 --
>
> Hi Jason,
>
> Maybe you could also remove the clock-frequency parameter from
> kirkwood-ns2-common.dtsi ?
Good catch, I must've been grepping through kirkwood*.dts and missed the
dtsi. I'll do a followup patch.
thx,
Jason.
next prev parent reply other threads:[~2013-02-05 11:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-29 21:09 [PATCH] ARM: kirkwood: of_serial: fix clock gating by removing clock-frequency Jason Cooper
2013-01-30 20:50 ` Simon Baatz
2013-02-04 1:33 ` Jason Cooper
2013-02-05 10:54 ` Simon Guinot
2013-02-05 11:13 ` Jason Cooper [this message]
2013-02-14 20:38 ` Jason Cooper
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