Hi Suravee,
This looks good, I just have a few fixups that would be nice to apply
below.
On Sat, Sep 20, 2014 at 05:31:38PM +0100, suravee.suthikulpanit@xxxxxxx wrote:
> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
>
> ARM GICv2m specification extends GICv2 to support MSI(-X) with
> a new set of register frame. This patch introduces support for
> the non-secure GICv2m register frame. Currently, GICV2m is available
> in certain version of GIC-400.
>
> The patch introduces a new property in ARM gic binding, the v2m subnode.
> It is optional.
>
> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
> Acked-by: Marc Zyngier <Marc.Zyngier@xxxxxxx>
> Cc: Mark Rutland <Mark.Rutland@xxxxxxx>
> Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
> Cc: Catalin Marinas <Catalin.Marinas@xxxxxxx>
> Cc: Will Deacon <Will.Deacon@xxxxxxx>
> ---
> Documentation/devicetree/bindings/arm/gic.txt | 55 ++++
> arch/arm64/Kconfig | 1 +
> drivers/irqchip/Kconfig | 5 +
> drivers/irqchip/Makefile | 1 +
> drivers/irqchip/irq-gic-common.c | 12 +
> drivers/irqchip/irq-gic-common.h | 4 +
> drivers/irqchip/irq-gic-v2m.c | 356 ++++++++++++++++++++++++++
> drivers/irqchip/irq-gic.c | 82 +++---
> drivers/irqchip/irq-gic.h | 54 ++++
> 9 files changed, 540 insertions(+), 30 deletions(-)
> create mode 100644 drivers/irqchip/irq-gic-v2m.c
> create mode 100644 drivers/irqchip/irq-gic.h
>
> diff --git a/Documentation/devicetree/bindings/arm/gic.txt b/Documentation/devicetree/bindings/arm/gic.txt
> index c7d2fa1..38b2156 100644
> --- a/Documentation/devicetree/bindings/arm/gic.txt
> +++ b/Documentation/devicetree/bindings/arm/gic.txt
> @@ -96,3 +96,58 @@ Example:
> <0x2c006000 0x2000>;
> interrupts = <1 9 0xf04>;
> };
> +
> +
> +* GICv2m extension for MSI/MSI-x support (Optional)
> +
> +Certain revision of GIC-400 supports MSI/MSI-x via V2M register frame.
> +This is enabled by specifying v2m sub-node.
It looks like this was missed when the binding was updated for multiple
frames, so:
s/revision/revisions/
s/frame/frame(s)/
s/sub-node/sub-node(s)/
> +
> +Required properties:
> +
> +- compatible : The value here should be "arm,gic-v2m-frame".
- compatible: should contain "arm,gic-v2m-frame".
> +
> +- msi-controller : Identifies the node as an MSI controller.
> +
> +- reg : GICv2m MSI interface register base and size
> +
> +Optional properties:
> +
> +- arm,msi-base-spi : Specify base SPI the MSI frame.
> + The SPI base value can be from 32 to 1019.
> +
> +- arm,msi-num-spi : Returns the number of contiguous SPIs assigned
> + to the frame.
> +
> +Note: "arm,msi-base-spi" and "arm,msi-num-spi" are used mainly for
> + providing HW workaround in the case where the MSI_TYPER register
> + is corrupted.
s/num-spi/num-spis/ please
Can we get rid of the note and reword this like:
- arm,msi-base-spi: When the MSI_TYPER register contains an incorrect
value, this property should contain the SPI base of
the MSI frame, overriding the HW value.
- arm,msi-num-spis: When the MSI_TYPER register contains an incorrect
value, this property should contain the number of
SPIs assigned to the frame, overriding the HW value.
I realise it's a little redundant, but it's very easy to miss usage
constraints in notes.
With that, for the binding:
Acked-by: Mark Rutland <mark.rutland@xxxxxxx>
Mark.
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