linux-kernel - Re: [PATCH 2/4] dt-bindings: irq: imx-irqsteer: add multi output interrupts support

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Message-ID: <1548413169.28802.43.camel@pengutronix.de>
Date:   Fri, 25 Jan 2019 11:46:09 +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 2/4] dt-bindings: irq: imx-irqsteer: add multi output
 interrupts support

Am Freitag, den 18.01.2019, 07:53 +0000 schrieb Aisheng Dong:
> One irqsteer channel can support up to 8 output interrupts.
> 
> > 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>
> ---
>  .../devicetree/bindings/interrupt-controller/fsl,irqsteer.txt        | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/fsl,irqsteer.txt b/Documentation/devicetree/bindings/interrupt-controller/fsl,irqsteer.txt
> index eaabcda..beeed4a 100644
> --- a/Documentation/devicetree/bindings/interrupt-controller/fsl,irqsteer.txt
> +++ b/Documentation/devicetree/bindings/interrupt-controller/fsl,irqsteer.txt
> @@ -6,8 +6,9 @@ Required properties:
> >  	- "fsl,imx8m-irqsteer"
> >  	- "fsl,imx-irqsteer"
>  - reg: Physical base address and size of registers.
> -- interrupts: Should contain the parent interrupt line used to multiplex the
> -  input interrupts.
> +- interrupts: Should contain the up to 8 parent interrupt lines used to
> +  multiplex the input interrupts. They should be sepcified seqencially
> +  from output 0 to 7. NOTE at least one output interrupt has to be specified.

I don't think the note clarifies anything. Given that the thing is a
irq multiplexer I don't think anyone expects that you could get away
with no output irq.

If anything this should specify that it's always groups of (up to) 64
input irqs being muxed onto a single output irq.

Regards,
Lucas