linux-kernel - Re: [PATCH v2 1/3] dt-bindings: interrupt-controller: Actions external interrupt controller

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Message-ID: <20180813194453.GA30702@rob-hp-laptop>
Date:   Mon, 13 Aug 2018 13:44:53 -0600
From:   Rob Herring <robh@...nel.org>
To:     Parthiban Nallathambi <pn@...x.de>
Cc:     tglx@...utronix.de, jason@...edaemon.net, marc.zyngier@....com,
        mark.rutland@....com, afaerber@...e.de, catalin.marinas@....com,
        will.deacon@....com, manivannan.sadhasivam@...aro.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, sravanhome@...il.com,
        thomas.liau@...ions-semi.com, mp-cs@...ions-semi.com,
        linux@...ietech.com, edgar.righi@...tec.org.br,
        laisa.costa@...tec.org.br, guilherme.simoes@...tec.org.br,
        mkzuffo@....usp.br
Subject: Re: [PATCH v2 1/3] dt-bindings: interrupt-controller: Actions
 external interrupt controller

On Sun, Aug 12, 2018 at 02:22:13PM +0200, Parthiban Nallathambi wrote:
> Actions Semi OWL family SoC's provides support for external interrupt
> controller to be connected and controlled using SIRQ pins. S500, S700
> and S900 provides 3 SIRQ lines and works independently for 3 external
> interrupt controllers.
> 
> Signed-off-by: Parthiban Nallathambi <pn@...x.de>
> Signed-off-by: Saravanan Sekar <sravanhome@...il.com>
> ---
>  .../interrupt-controller/actions,owl-sirq.txt      | 46 ++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/actions,owl-sirq.txt
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/actions,owl-sirq.txt b/Documentation/devicetree/bindings/interrupt-controller/actions,owl-sirq.txt
> new file mode 100644
> index 000000000000..4b8437751331
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/actions,owl-sirq.txt
> @@ -0,0 +1,46 @@
> +Actions Semi Owl SoCs SIRQ interrupt controller
> +
> +S500, S700 and S900 SoC's from Actions provides 3 SPI's from GIC,
> +in which external interrupt controller can be connected. 3 SPI's
> +45, 46, 47 from GIC are directly exposed as SIRQ. It has
> +the following properties:
> +
> +- inputs three interrupt signal from external interrupt controller
> +
> +Required properties:
> +
> +- compatible: should be "actions,owl-sirq"
> +- reg: physical base address of the controller and length of memory mapped.
> +- interrupt-controller: identifies the node as an interrupt controller
> +- #interrupt-cells: specifies the number of cells needed to encode an interrupt
> +  source, should be 2.

> +- actions,sirq-shared-reg: Applicable for S500 and S700 where SIRQ register
> +  details are maintained at same offset/register.
> +- actions,sirq-offset: register offset for SIRQ interrupts. When registers are
> +  shared, all the three offsets will be same (S500 and S700).

You should have more specific compatible strings if there are 
differences and these settings can be implied by them.

> +- actions,sirq-clk-sel: external interrupt controller can be either
> +  connected to 32Khz or 24Mhz external/internal clock. This needs
> +  to be configured for per SIRQ line. Failing defaults to 32Khz clock.

What are the valid values?

> +
> +Example for S900:
> +
> +sirq: interrupt-controller@...b0000 {
> +	compatible = "actions,owl-sirq";
> +	reg = <0 0xe01b0000 0 0x1000>;
> +	interrupt-controller;
> +	#interrupt-cells = <2>;
> +	actions,sirq-clk-sel = <0 0 0>;

If 0 is 32khz, then having this is pointless. But I can't tell what the 
values correspond to.

> +	actions,sirq-offset = <0x200 0x528 0x52c>;
> +};
> +
> +Example for S500 and S700:
> +
> +sirq: interrupt-controller@...b0000 {
> +	compatible = "actions,owl-sirq";
> +	reg = <0 0xe01b0000 0 0x1000>;
> +	interrupt-controller;
> +	#interrupt-cells = <2>;
> +	actions,sirq-shared-reg;
> +	actions,sirq-clk-sel = <0 0 0>;
> +	actions,sirq-offset = <0x200 0x200 0x200>;
> +};
> -- 
> 2.14.4
>