On 09/14/2015 03:06 PM, Geert Uytterhoeven wrote:
> Depending on the GIC variant, the GIC module has one or more clock
> inputs. Document the optional "clocks" and "clock-names" properties,
> and their possible values, based on the Technical Reference Manuals.
> optional.
>
> Add the optional "power-domains" property.
>
> This will allow to describe in DT the relationship between the GIC and
> the Clock and/or Power Domain topology on SoCs where this is relevant
> and needed for proper operation.
>
> Note: As the current GIC driver doesn't support Runtime PM yet, PM
> Domain constraints must be handled elsewhere in e.g. platform code.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> ---
> Note: v1 was Acked-by: Rob Herring <robh@xxxxxxxxxx>, but I didn't add
> it, due to the addition of clock-names.
For both: ack.
>
> v2:
> - Add "clock-names",
> - Document clock inputs on various GIC variants.
>
> Clock inputs are based on the following documentation:
> - "ARM11 MPCore Processor Technical Reference Manual" (r2p0),
> - "Cortex-A9 MPCore Technical Reference Manual" (r4p1, r2p0),
> - "Cortex-A15 Technical Reference Manual" (r4p0, r2p0),
> - "CoreLink GIC-400 Generic Interrupt Controller Technical Reference
> Manual" (r0p1, r0p0),
> - "PrimeCell Generic Interrupt Controller (PL390) Technical Reference
> Manual" (r0p0).
>
> I could not find clock input information in:
> - "ARM1176JZF Development Chip Technical Reference Manual" (r0p0),
> - "Cortex-A7 MPCore processors" (r0p5, r0p3).
>
> Other:
> - "brcm,brahma-b15-gic" seems to be always used together with
> "arm,cortex-a15-gic".
>
> No access to datasheets:
> - "qcom,msm-8660-qgic",
> - "qcom,msm-qgic2".
> ---
> Documentation/devicetree/bindings/arm/gic.txt | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/arm/gic.txt b/Documentation/devicetree/bindings/arm/gic.txt
> index 24742853ba460223..cc56021eb60babea 100644
> --- a/Documentation/devicetree/bindings/arm/gic.txt
> +++ b/Documentation/devicetree/bindings/arm/gic.txt
> @@ -59,6 +59,21 @@ Optional
> regions, used when the GIC doesn't have banked registers. The offset is
> cpu-offset * cpu-nr.
>
> +- clocks : List of phandle and clock-specific pairs, one for each entry
> + in clock-names.
> +- clock-names : List of names for the GIC clock input(s). Valid clock names
> + depend on the GIC variant:
> + "ic_clk" (for "arm,arm11mp-gic")
> + "PERIPHCLKEN" (for "arm,cortex-a15-gic")
> + "PERIPHCLK", "PERIPHCLKEN" (for "arm,cortex-a9-gic")
> + "clk" (for "arm,gic-400")
> + "gclk" (for "arm,pl390")
> +
> +- power-domains : A phandle and PM domain specifier as defined by bindings of
> + the power controller specified by phandle, used when the GIC
> + is part of a Power or Clock Domain.
> +
> +
> Example:
>
> intc: interrupt-controller@fff11000 {
>
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