[PATCH RESEND 1/2] irqchip: Add generic gic-v1/gic-v2 compat strings.

[Rob Herring]

On Wed, May 21, 2014 at 8:48 AM, Nikolay Borisov
<Nikolay.Borisov at arm.com> 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.

This just encourages not having specific properties which then also
prevents being able to add work-arounds later. SOCs using the a9 or
a15 string ONLY that are not an a9 or a15 are wrong. That's what we
should fix. Adding more generic strings is not going to help that. Do
you have a specific work-around you need to implement?

Given that the GIC specs are obviously meaningless since we now have
GICv2 with 16 core support as well as the special exynos gics, I'm not
inclined to accept this.

Rob

> compatible = "$VENDOR,specific-gic-variant", "arm,gic-v2";
>
> Signed-off-by: Nikolay Borisov <Nikolay.Borisov at arm.com>
> Acked-by: Mark Rutland <Mark.Rutland at arm.com>
> ---
>  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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