linux-kernel - Re: [PATCH V3 1/2] dt-bindings/irq: add binding for NXP INTMUX interrupt multiplexer

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Message-ID: <0cecd3af-8bca-c0d3-1312-925624c63dbf@ti.com>
Date:   Fri, 20 Dec 2019 17:10:26 +0530
From:   Lokesh Vutla <lokeshvutla@...com>
To:     Joakim Zhang <qiangqing.zhang@....com>, <maz@...nel.org>,
        <tglx@...utronix.de>, <jason@...edaemon.net>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <shawnguo@...nel.org>,
        <s.hauer@...gutronix.de>
CC:     <fugang.duan@....com>, <linux-kernel@...r.kernel.org>,
        <linux-imx@....com>, <kernel@...gutronix.de>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH V3 1/2] dt-bindings/irq: add binding for NXP INTMUX
 interrupt multiplexer



On 20/12/19 1:07 PM, Joakim Zhang wrote:
> This patch adds the DT bindings for the NXP INTMUX interrupt multiplexer
> for i.MX8 family SoCs.
> 
> Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
> ---
>  .../interrupt-controller/fsl,intmux.txt       | 36 +++++++++++++++++++
>  1 file changed, 36 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/fsl,intmux.txt
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/fsl,intmux.txt b/Documentation/devicetree/bindings/interrupt-controller/fsl,intmux.txt
> new file mode 100644
> index 000000000000..3ebe9cac5f20
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/fsl,intmux.txt
> @@ -0,0 +1,36 @@
> +Freescale INTMUX interrupt multiplexer
> +
> +Required properties:
> +
> +- compatible: Should be:
> +   - "fsl,imx-intmux"
> +- reg: Physical base address and size of registers.
> +- interrupts: Should contain the parent interrupt lines (up to 8) used to
> +  multiplex the input interrupts.
> +- clocks: Should contain one clock for entry in clock-names.
> +- clock-names:
> +   - "ipg": main logic clock
> +- interrupt-controller: Identifies the node as an interrupt controller.
> +- #interrupt-cells: Specifies the number of cells needed to encode an
> +  interrupt source. The value must be 2.
> +   - the 1st cell: hardware interrupt number> +   - the 2nd cell: channel index, value must smaller than channels used

As per the xlate function, 1st cell is channel index and 2nd cell is hw
interrupt number no?

Thanks and regards,
Lokesh

> +
> +Optional properties:
> +
> +- fsl,intmux_chans: The number of channels used for interrupt source. The
> +  Maximum value is 8. If this property is not set in DT then driver uses
> +  1 channel by default.
> +
> +Example:
> +
> +	intmux@...00000 {
> +		compatible = "fsl,imx-intmux";
> +		reg = <0x37400000 0x1000>;
> +		interrupts = <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>;
> +		clocks = <&clk IMX8QM_CM40_IPG_CLK>;
> +		clock-names = "ipg";
> +		interrupt-controller;
> +		#interrupt-cells = <1>;
> +	};
> +
>