From: Marc Zyngier <marc.zyngier-5wv7dgnIgG8@public.gmane.org>
To: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>
Subject: Re: [PATCH] dt-bindings: arm,gic-v3: require that reserved cells are always 0
Date: Wed, 3 Feb 2016 18:15:42 +0000 [thread overview]
Message-ID: <56B243CE.9030807@arm.com> (raw)
In-Reply-To: <1454522458-29643-1-git-send-email-will.deacon-5wv7dgnIgG8@public.gmane.org>
On 03/02/16 18:00, Will Deacon wrote:
> The arm,gic-v3 binding was written with good intentions and doesn't
> enforce interrupt-cells to be 3, therefore making it easy to extend
> the irq description in future if necessary:
>
> > Cells 4 and beyond are reserved for future use.
>
> Unfortunately, this sentence is immediately followed up with:
>
> > When the 1st cell has a value of 0 or 1, cells 4 and beyond act as
> > padding, and may be ignored. It is recommended that padding cells
> > have a value of 0.
>
> Consequently, any extensions to the PPI or SPI interrupt specifiers must
> be able to work with random crap from legacy DTs, effectively
> necessitating a new interrupt type in the first cell. Sigh.
>
> This patch fixes the text so that additional, reserved cells are
> required to be zero. This looks like a reasonable thing to require and
> is already satisifed by the .dts files in-tree.
>
> Cc: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>
> Cc: Marc Zyngier <marc.zyngier-5wv7dgnIgG8@public.gmane.org>
> Signed-off-by: Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Acked-by: Marc Zyngier <marc.zyngier-5wv7dgnIgG8@public.gmane.org>
M.
--
Jazz is not dead. It just smells funny...
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next prev parent reply other threads:[~2016-02-03 18:15 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-03 18:00 [PATCH] dt-bindings: arm,gic-v3: require that reserved cells are always 0 Will Deacon
[not found] ` <1454522458-29643-1-git-send-email-will.deacon-5wv7dgnIgG8@public.gmane.org>
2016-02-03 18:15 ` Marc Zyngier [this message]
2016-02-03 18:20 ` Mark Rutland
2016-02-03 18:40 ` Will Deacon
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