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

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Date:   Fri, 10 May 2019 16:57:54 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Marc Zyngier <marc.zyngier@....com>
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

Thx Marc,

On Mon, Feb 18, 2019 at 02:28:45PM +0000, Marc Zyngier wrote:
> 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.
There is no DTs upstreamed and current implementation of driver could
support old format which isn't mentioned here. We just give a complete
format here.

Best Regards
 Guo Ren