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

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Date:   Fri, 20 Dec 2019 18:00:28 +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:     <linux-arm-kernel@...ts.infradead.org>, <fugang.duan@....com>,
        <linux-kernel@...r.kernel.org>, <kernel@...gutronix.de>,
        <linux-imx@....com>
Subject: Re: [PATCH V3 1/2] dt-bindings/irq: add binding for NXP INTMUX
 interrupt multiplexer

On 20/12/19 5:10 PM, Lokesh Vutla wrote:
> 
> 
> 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?

Sorry my bad, I read it wrong. Ignore this comment.

Thanks and regards,
Lokesh

> 
> 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>;
>> +	};
>> +
>>
> 
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> 

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