linux-kernel - Re: [PATCH V2 1/4] dt-binding: irq: imx-irqsteer: use irq number instead of group number

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Date:   Wed, 30 Jan 2019 14:17:47 +0100
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Aisheng Dong <aisheng.dong@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        dl-linux-imx <linux-imx@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        Marc Zyngier <marc.zyngier@....com>
Subject: Re: [PATCH V2 1/4] dt-binding: irq: imx-irqsteer: use irq number
 instead of group number

Am Mittwoch, den 30.01.2019, 13:05 +0000 schrieb Aisheng Dong:
> Not all 64 interrupts may be used in one group. e.g. most irqsteer in
> imx8qxp and imx8qm subsystems supports only 32 interrupts.
> 
> As the IP integration parameters are Channel number and interrupts number,
> let's use fsl,num-irqs to represents how many interrupts supported
> by this irqsteer channel.
> 
> > Cc: Marc Zyngier <marc.zyngier@....com>
> > Cc: Rob Herring <robh+dt@...nel.org>
> > Cc: Lucas Stach <l.stach@...gutronix.de>
> > Cc: Shawn Guo <shawnguo@...nel.org>
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Dong Aisheng <aisheng.dong@....com>

As the original fsl,irq-groups was born out of a misunderstanding of
the HW config options and I'm not aware of any users of the current
binding, I'm fine with merging this. I do think this warrants a
backport to stable though, so we don't end up with different bindings
in stable and current kernels.

Reviewed-by: Lucas Stach <l.stach@...gutronix.de>


> ---
> ChangeLog:
>  v1->v2:
>   * change property name fsl,irqs-per-chan to fsl,num-irqs.
> ---
>  .../devicetree/bindings/interrupt-controller/fsl,irqsteer.txt       | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/fsl,irqsteer.txt b/Documentation/devicetree/bindings/interrupt-controller/fsl,irqsteer.txt
> index 45790ce..6d0a41b 100644
> --- a/Documentation/devicetree/bindings/interrupt-controller/fsl,irqsteer.txt
> +++ b/Documentation/devicetree/bindings/interrupt-controller/fsl,irqsteer.txt
> @@ -16,8 +16,8 @@ Required properties:
>  - #interrupt-cells: Specifies the number of cells needed to encode an
>    interrupt source. The value must be 1.
>  - fsl,channel: The output channel that all input IRQs should be steered into.
> -- fsl,irq-groups: Number of IRQ groups managed by this controller instance.
> -  Each group manages 64 input interrupts.
> +- fsl,num-irqs: Number of input interrupts of this channel.
> +  Should be multiple of 32 input interrupts and up to 512 interrupts.
>  
>  Example:
>  
> @@ -28,7 +28,7 @@ Example:
> >  		clocks = <&clk IMX8MQ_CLK_DISP_APB_ROOT>;
> >  		clock-names = "ipg";
> >  		fsl,channel = <0>;
> > -		fsl,irq-groups = <1>;
> > +		fsl,num-irqs = <64>;
> >  		interrupt-controller;
> >  		#interrupt-cells = <1>;
> >  	};