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

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Date:   Wed, 7 Jun 2017 16:29:50 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
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 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?

      Arnd