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SubjectRe: [PATCH 1/3] dt-bindings/irq: add binding for NXP INTMUX interrupt multiplexer
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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@nxp.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@37400000 {
> + 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...

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