linux-kernel - Re: [PATCH 14/15] dt-bindings: arm-gic: Drop 'clock-names' from binding document

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Date:	Fri, 18 Mar 2016 10:56:58 +0000
From:	Jon Hunter <jonathanh@...dia.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Benoît Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Kevin Hilman <khilman@...nel.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	<linux-tegra@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 14/15] dt-bindings: arm-gic: Drop 'clock-names' from
 binding document


On 18/03/16 10:52, Geert Uytterhoeven wrote:
> Hi Jon,
> 
> On Fri, Mar 18, 2016 at 11:13 AM, Jon Hunter <jonathanh@...dia.com> wrote:
>> On 18/03/16 09:13, Geert Uytterhoeven wrote:
>>> On Thu, Mar 17, 2016 at 3:19 PM, Jon Hunter <jonathanh@...dia.com> wrote:
>>>> Commit afbbd2338176 ("irqchip/gic: Document optional Clock and Power
>>>> Domain properties") documented optional clock and power-dmoain properties
>>>> for the ARM GIC. Currently, there are no users of these and for the
>>>> Tegra210 Audio GIC (based upon the GIC-400) there are two clocks, a
>>>> functional clock and interface clock, that need to be enabled.
>>>
>>> The reason that there are no users for this is twofold:
>>>   1. The GIC driver doesn't have Runtime PM support yet,
>>>   2. There was no clean way to prevent the GIC's clock from being disabled.
>>> Due to this, adding the clocks to the DTSes would mean that they will be
>>> disabled during boot up as unused clocks, leading to a system lock-up.
>>>
>>> I had hoped your series would fix part 1. I gave it a try on r8a7791/koelsch,
>>> but unfortunately it seems the platform driver only supports non-root
>>> controllers, while the r8a7791 GIC is the primary one...
>>
>> Can you try making the following change ...
> 
> Thanks! I gave it a try, but no difference.

I assume you added the appropriate compatible flag? Any more details you
can share about why it is not working? Is it not registered early enough?

Jon