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Date:   Wed, 13 Feb 2019 16:27:00 -0600
From:   Rob Herring <robh@...nel.org>
To:     Marc Zyngier <marc.zyngier@....com>
Cc:     Aisheng Dong <aisheng.dong@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        dl-linux-imx <linux-imx@....com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>
Subject: Re: [PATCH V3 1/4] dt-binding: irq: imx-irqsteer: use irq number
 instead of group number

On Mon, Feb 11, 2019 at 03:35:40PM +0000, Marc Zyngier wrote:
> On 31/01/2019 08:03, Aisheng Dong wrote:
> > 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,irqs-num to represents how many interrupts supported
> > by this irqsteer channel.
> > 
> > Cc: Marc Zyngier <marc.zyngier@....com>
> > Cc: Rob Herring <robh+dt@...nel.org>
> > Cc: Shawn Guo <shawnguo@...nel.org>
> > Cc: devicetree@...r.kernel.org
> > Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
> > Signed-off-by: Dong Aisheng <aisheng.dong@....com>
> > ---
> > 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>;
> >  	};
> > 
> 
> This is a change to an existing binding, so I'd need the Ack from a DT
> maintainer before I can queue this.

The DT maintainer doesn't care as long as there's an explanation that 
says it's breaking compatibility and why it is okay to do so. This one 
doesn't do that.

Rob

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