linux-kernel - Re: [PATCH v2 1/2] dt-bindings: arm,gic: Fix binding example for a virt-capable GIC

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Date:   Mon, 30 Jan 2017 08:41:08 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     Olof Johansson <olof@...om.net>, Rob Herring <robh@...nel.org>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Mark Rutland <mark.rutland@....com>,
        Tsahee Zidenberg <tsahee@...apurnalabs.com>,
        Antoine Tenart <antoine.tenart@...e-electrons.com>,
        Russell King <linux@...linux.org.uk>,
        Beno?t Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Simon Horman <horms@...ge.net.au>,
        Magnus Damm <magnus.damm@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>, arm@...nel.org
Subject: Re: [PATCH v2 1/2] dt-bindings: arm,gic: Fix binding example for a
 virt-capable GIC

On 29/01/17 22:51, Olof Johansson wrote:
> On Fri, Jan 27, 2017 at 02:30:01PM -0600, Rob Herring wrote:
>> On Mon, Jan 23, 2017 at 03:56:13PM +0000, Marc Zyngier wrote:
>>> The joys of copy/paste: the example of a virtualization capable GIC
>>> in the DT binding was wrong, and propagated to dozens of platforms.
>>> By having a GICC region that is only 4kB (instead of 8kB), we
>>> end-up not being able to access the GICC_DIR register which is on
>>> the second page.
>>>
>>> Oh well. Let's fix the source of the crap before tackling individual
>>> offenders. While we're at it, also fix the compatibility string to
>>> mention "arm,gic-400", which is the name of the actual implementation
>>> of the GICv2 spec.
>>
>> "While we're at it", code for should be in a separate patch. :) I 
>> wouldn't really care here, but you are not fixing anything...
>>
>>>
>>> Acked-by: Tony Lindgren <tony@...mide.com>
>>> Acked-by: Mark Rutland <mark.rutland@....com>
>>> Acked-by: Arnd Bergmann <arnd@...db.de>
>>> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
>>> ---
>>>  Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt | 4 ++--
>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt b/Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt
>>> index 5393e2a..a3d51ed 100644
>>> --- a/Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt
>>> +++ b/Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt
>>> @@ -107,11 +107,11 @@ Required properties:
>>>  Example:
>>>  
>>>  	interrupt-controller@...01000 {
>>> -		compatible = "arm,cortex-a15-gic";
>>> +		compatible = "arm,gic-400";
>>
>> Which one is correct really depends on the platform. The A15 can have an 
>> internal or external (gic-400) GIC. The former string is correct for an 
>> A15 with an internal GIC. One such platform is Calxeda midway.
>>
>> Arguably, we should not have arm,gic-400 by itself, but have an SoC 
>> specific compatible in case it was integrated in interesting ways.
> 
> Good point (and thanks for bringing it up).
> 
> Marc, based on this; want to back the above out so we can apply the rest for
> now, while you battle on the compatible details? :)

Fair enough. I'll back that out, respin and resend.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...