On Wed, Apr 20, 2016 at 12:03:56PM +0100, Jon Hunter wrote:
> The Tegra AGIC interrupt controller is compatible with the ARM GIC-400
> interrupt controller.
The cover letter says it _is_ a GIC-400, just used in a slightly unusual
manner (i.e. not directly connected to CPUs).
> The Tegra AGIC requires two clocks, namely the
> "ape" (functional) and "apb2ape" (interface) clocks, to operate. Add
> the compatible string and clock information for the AGIC to the GIC
> device-tree binding documentation.
The GIC-400 spec only describes "CLK" (which is what I imagine "ape" is.
There isn't an APB clock described, and the manual seems to show GIC-400
directly connected to AXI rather than APB, so that doesn't seem to even
be the usual "apb_pclk".
Is there some wrapper logic around a GIC-400 to giove it an APB
interface? Or am I misudnerstanding the spec?
> Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
> ---
>
> I am not sure if it will be popular to add Tegra specific clock names
> to the GIC DT docs. However, in that case, then possibly the only
> alternative is to move the Tegra AGIC driver into its own file and
> expose the GIC APIs for it to use. Then we could add our own DT doc
> for the Tegra AGIC as well (based upon the ARM GIC).
The clock-names don't seem right to me, as they sound like provide names
or global clock line names rather than consumer-side names ("clk" and
"apb_pclk").
I'm also not certain about the compatible string; if this really is a
GIC-400 then I would at least expect "arm,gic-400" as a fallback.
Thanks,
Mark.
> Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt b/Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt
> index 793c20ff8fcc..6f34267f1438 100644
> --- a/Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt
> +++ b/Documentation/devicetree/bindings/interrupt-controller/arm,gic.txt
> @@ -21,6 +21,7 @@ Main node required properties:
> "arm,pl390"
> "arm,tc11mp-gic"
> "brcm,brahma-b15-gic"
> + "nvidia,tegra210-agic"
> "qcom,msm-8660-qgic"
> "qcom,msm-qgic2"
> - interrupt-controller : Identifies the node as an interrupt controller
> @@ -70,6 +71,7 @@ Optional
> "PERIPHCLK", "PERIPHCLKEN" (for "arm,cortex-a9-gic")
> "clk" (for "arm,gic-400")
> "gclk" (for "arm,pl390")
> + "ape" and "apb2ape" (for "nvidia,tegra,agic")
>
> - power-domains : A phandle and PM domain specifier as defined by bindings of
> the power controller specified by phandle, used when the GIC
> --
> 2.1.4
>
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