linux-kernel - Re: [PATCH] arm: aspeed: Add clock-names property to timer node

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Date:   Thu, 8 Jun 2017 15:26:40 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Joel Stanley <joel@....id.au>, Andrew Jeffery <andrew@...id.au>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH] arm: aspeed: Add clock-names property to timer node

On Wed, Jun 07, 2017 at 04:29:50PM +0200, Arnd Bergmann wrote:
> On Wed, Jun 7, 2017 at 2:52 PM, Daniel Lezcano
> <daniel.lezcano@...aro.org> wrote:
> > On Tue, Jun 06, 2017 at 11:41:11AM +0200, Arnd Bergmann wrote:
> >> On Mon, Jun 5, 2017 at 10:59 AM, Joel Stanley <joel@....id.au> wrote:
> >> > On Mon, Jun 5, 2017 at 5:18 PM, Andrew Jeffery <andrew@...id.au> wrote:
> >> >> The merging of a number of clocksource drivers into fttmr010 means we
> >> >> require clock-names to be specified in the Aspeed timer node, else the
> >> >> clocksource fails to probe and boot hangs.
> >> >
> >> > Arnd,
> >> >
> >> > Linus' reworked timer driver will go into 4.13.
> >> >
> >> > Can we get this patch merged into 4.12 as a fix so we don't end up
> >> > with a broken boot at any stage?
> >>
> >> Hmm, can't we make the driver backward-compatible and have it fall
> >> back on the first clock if no clk named "PCLK" is found? Otherwise
> >> you still have an incompatible change in the DT binding and it will
> >> break if someone uses an older dtb with a newer kernel.
> >
> > I would like to avoid to hack the kernel code for backward DT compatible
> > things.
> 
> How about a fixup in the platform code to add the property then?

Dunno, do you have an example?

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