Re: [PATCH 2/2] documentation/devicetree: Update GIC compat strings

Re: [PATCH 2/2] documentation/devicetree: Update GIC compat strings

[Mark Rutland]

[Adding devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org]

On Wed, May 21, 2014 at 10:28:21AM +0100, Nikolay Borisov wrote:
> Document the addition of 2 new, implementation-agnostic compatible
> strings. This allows for more flexibility such that new implementation 
> can either state whether they are an extension of an existing implementation,
> a brand new implementation or just that they conform to a standard revision
> of the GIC spec.

>From my POV it makes sense to have these to make it possible to write
DTs with new GIC variants which are implementations of the standard
rather than extensions of existing implementations.

However, DTs using these should also state exactly what variant they
are, and those strings should be documented (even if not supported
directly by the driver). It would be nice to have that mentioned in the
commit message.

Otherwise:

Acked-by: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>

Cheers,
Mark.

> 
> Signed-off-by: Nikolay Borisov <Nikolay.Borisov-5wv7dgnIgG8@public.gmane.org>
> ---
>  Documentation/devicetree/bindings/arm/gic.txt | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/arm/gic.txt b/Documentation/devicetree/bindings/arm/gic.txt
> index 5573c08..223b4cc 100644
> --- a/Documentation/devicetree/bindings/arm/gic.txt
> +++ b/Documentation/devicetree/bindings/arm/gic.txt
> @@ -12,6 +12,8 @@ Main node required properties:
>  
>  - compatible : should be one of:
>  	"arm,gic-400"
> +	"arm,gic-v1"
> +	"arm,gic-v2"
>  	"arm,cortex-a15-gic"
>  	"arm,cortex-a9-gic"
>  	"arm,cortex-a7-gic"
> -- 
> 1.8.1.5
> 
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Re: [PATCH 1/2] irqchip: Add generic gic-v1/gic-v2 compat strings.

[Mark Rutland]

[adding devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org]

On Wed, May 21, 2014 at 10:28:20AM +0100, Nikolay Borisov wrote:
> The current set of GIC compatible strings only contains specific
> implementations (e.g. arm,cortex-a9-gic) rather than revisions of the
> standard (e.g. arm,gic-v2), so each new implementation must either claim
> to be an extension of an existing implementation or have a new string
> added to the driver. This may be problematic when workarounds are
> required for bugs in particular implementations, as said workaround may
> end up targeting a wider set of implementations than intended.
> 
> To prevent these issues, this patch adds compatible strings for the
> revisions of the GIC spec which all GIC implementations should be able
> to claim conformance to in addition to any particular implementation
> specific string, e.g.
> 
> compatible = "$VENDOR,specific-gic-variant", "arm,gic-v2";

This makes sense to me, so:

Acked-by: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>

Cheers,
Mark.

> 
> Signed-off-by: Nikolay Borisov <Nikolay.Borisov-5wv7dgnIgG8@public.gmane.org>
> ---
>  drivers/irqchip/irq-gic.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
> index 57d165e..89e9b05 100644
> --- a/drivers/irqchip/irq-gic.c
> +++ b/drivers/irqchip/irq-gic.c
> @@ -1073,6 +1073,8 @@ gic_of_init(struct device_node *node, struct device_node *parent)
>  }
>  IRQCHIP_DECLARE(cortex_a15_gic, "arm,cortex-a15-gic", gic_of_init);
>  IRQCHIP_DECLARE(cortex_a9_gic, "arm,cortex-a9-gic", gic_of_init);
> +IRQCHIP_DECLARE(gic_v1, "arm,gic-v1", gic_of_init);
> +IRQCHIP_DECLARE(gic_v2, "arm,gic-v2", gic_of_init);
>  IRQCHIP_DECLARE(msm_8660_qgic, "qcom,msm-8660-qgic", gic_of_init);
>  IRQCHIP_DECLARE(msm_qgic2, "qcom,msm-qgic2", gic_of_init);
>  
> -- 
> 1.8.1.5
> 
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Re: [PATCH 2/2] documentation/devicetree: Update GIC compat strings

[Jason Cooper]

Nikolay,

On Wed, May 21, 2014 at 11:24:39AM +0100, Mark Rutland wrote:
> [Adding devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org]
> 
> On Wed, May 21, 2014 at 10:28:21AM +0100, Nikolay Borisov wrote:
> > Document the addition of 2 new, implementation-agnostic compatible
> > strings. This allows for more flexibility such that new implementation 
> > can either state whether they are an extension of an existing implementation,
> > a brand new implementation or just that they conform to a standard revision
> > of the GIC spec.
> 
> From my POV it makes sense to have these to make it possible to write
> DTs with new GIC variants which are implementations of the standard
> rather than extensions of existing implementations.
> 
> However, DTs using these should also state exactly what variant they
> are, and those strings should be documented (even if not supported
> directly by the driver). It would be nice to have that mentioned in the
> commit message.

Please tweak the commit message as Mark suggested and resend, including
me in the Cc.  I'll queue it up for tglx.

> Otherwise:
> 
> Acked-by: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>
> 

Also, please include Mark's Acks.

thx,

Jason.
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