linux-kernel - Re: [PATCH 1/3] dt-bindings/irq: add binding for NXP INTMUX interrupt multiplexer

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Date:   Wed, 18 Dec 2019 09:45:16 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Joakim Zhang <qiangqing.zhang@....com>
Cc:     <tglx@...utronix.de>, <jason@...edaemon.net>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <shawnguo@...nel.org>,
        <s.hauer@...gutronix.de>, <shengjiu.wang@....com>,
        <kernel@...gutronix.de>, <festevam@...il.com>, <linux-imx@....com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <fugang.duan@....com>,
        <aisheng.dong@....com>
Subject: Re: [PATCH 1/3] dt-bindings/irq: add binding for NXP INTMUX  interrupt multiplexer

On 2019-12-18 07:20, Joakim Zhang wrote:
> This patch adds the DT bindings for the NXP INTMUX interrupt 
> multiplexer
> found in the i.MX8 family SoCs.
>
> Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
> ---
>  .../interrupt-controller/fsl,intmux.txt       | 34 
> +++++++++++++++++++
>  1 file changed, 34 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..be3c6848f36c
> --- /dev/null
> +++ 
> b/Documentation/devicetree/bindings/interrupt-controller/fsl,intmux.txt
> @@ -0,0 +1,34 @@
> +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 1.
> +
> +Optional properties:
> +
> +- fsl,intmux_chans: The number of channels used for interrupt 
> source. The
> +  Maximum value is 8.
> +
> +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>;
> +		fsl,intmux_chans = <1>;
> +	};
> +

What I don't understand is how the interrupt descriptor can indicate
which channel it is multiplexed on. The driver doesn't makes this
clear either, and I strongly suspect that it was never tested with
more than a single channel...

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...