linux-kernel - Re: [PATCH V2 5/7] dt-bindings: interrupt-controller: Update csky mpintc

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Message-ID: <20190218142845.4ad56ec0@why.wild-wind.fr.eu.org>
Date:   Mon, 18 Feb 2019 14:28:45 +0000
From:   Marc Zyngier <marc.zyngier@....com>
To:     guoren@...nel.org
Cc:     tglx@...utronix.de, robh+dt@...nel.org,
        linux-kernel@...r.kernel.org, Guo Ren <ren_guo@...ky.com>
Subject: Re: [PATCH V2 5/7] dt-bindings: interrupt-controller: Update csky
 mpintc

On Mon, 18 Feb 2019 10:04:41 +0800
guoren@...nel.org wrote:

> From: Guo Ren <ren_guo@...ky.com>
> 
> Add trigger type and priority setting for csky,mpintc.
> 
> Changelog:
>  - change #interrupt-cells to <3>
> 
> Signed-off-by: Guo Ren <ren_guo@...ky.com>
> Cc: Marc Zyngier <marc.zyngier@....com>
> Cc: Rob Herring <robh+dt@...nel.org>
> ---
>  .../bindings/interrupt-controller/csky,mpintc.txt   | 21 +++++++++++++++++----
>  1 file changed, 17 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt b/Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt
> index ab921f1..dccd913 100644
> --- a/Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt
> +++ b/Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt
> @@ -6,11 +6,18 @@ C-SKY Multi-processors Interrupt Controller is designed for ck807/ck810/ck860
>  SMP soc, and it also could be used in non-SMP system.
>  
>  Interrupt number definition:
> -
>    0-15  : software irq, and we use 15 as our IPI_IRQ.
>   16-31  : private  irq, and we use 16 as the co-processor timer.
>   31-1024: common irq for soc ip.
>  
> +Interrupt triger mode:
> + IRQ_TYPE_LEVEL_HIGH (default)
> + IRQ_TYPE_LEVEL_LOW
> + IRQ_TYPE_EDGE_RISING
> + IRQ_TYPE_EDGE_FALLING
> +
> +Interrupt priority range: 0-255
> +
>  =============================
>  intc node bindings definition
>  =============================
> @@ -26,15 +33,21 @@ intc node bindings definition
>  	- #interrupt-cells
>  		Usage: required
>  		Value type: <u32>
> -		Definition: must be <1>
> +		Definition: <3>

This seem to be invalidating all existing DTs. Is this an acceptable
thing to do? It will require an Ack from a DT maintainer.

>  	- interrupt-controller:
>  		Usage: required
>  
> -Examples:
> +Examples: ("interrupts = <irq_num IRQ_TYPE_XXX priority>")
>  ---------
>  
>  	intc: interrupt-controller {
>  		compatible = "csky,mpintc";
> -		#interrupt-cells = <1>;
> +		#interrupt-cells = <3>;
>  		interrupt-controller;
>  	};
> +
> +	device: device-example {
> +		...
> +		interrupts = <34 IRQ_TYPE_EDGE_RISING 254>;
> +		interrupt-parent = <&intc>;
> +	};

Thanks,

	M.
-- 
Without deviation from the norm, progress is not possible.