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Date:   Wed, 20 Feb 2019 06:36:27 +0000
From:   Aisheng Dong <aisheng.dong@....com>
To:     Rob Herring <robh@...nel.org>, Marc Zyngier <marc.zyngier@....com>
CC:     "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

> From: Rob Herring [mailto:robh@...nel.org]
> Sent: Thursday, February 14, 2019 6:27 AM> 
> 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,irqstee
> > > r.txt
> > > b/Documentation/devicetree/bindings/interrupt-controller/fsl,irqstee
> > > r.txt
> > > index 45790ce..6d0a41b 100644
> > > ---
> > > a/Documentation/devicetree/bindings/interrupt-controller/fsl,irqstee
> > > r.txt
> > > +++ b/Documentation/devicetree/bindings/interrupt-controller/fsl,irq
> > > +++ steer.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.
> 

Got it.
I will add them and resend, thanks for the suggestion.

Regards
Dong Aisheng

> Rob

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