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Date:   Fri, 10 May 2019 19:01:19 +0100
Message-ID: <86sgtmchow.wl-marc.zyngier@arm.com>
From:   Marc Zyngier <marc.zyngier@arm.com>
To:     Guo Ren <guoren@kernel.org>
Cc:     tglx@linutronix.de, robh+dt@kernel.org,
        linux-kernel@vger.kernel.org, Guo Ren <ren_guo@c-sky.com>
Subject: Re: [PATCH V2 5/7] dt-bindings: interrupt-controller: Update csky mpintc
In-Reply-To: <20190510083546.GA27608@guoren-Inspiron-7460>
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On Fri, 10 May 2019 09:57:54 +0100,
Guo Ren <guoren@kernel.org> wrote:
> 
> 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@kernel.org wrote:
> > 
> > > From: Guo Ren <ren_guo@c-sky.com>
> > > 
> > > Add trigger type and priority setting for csky,mpintc.
> > > 
> > > Changelog:
> > >  - change #interrupt-cells to <3>
> > > 
> > > Signed-off-by: Guo Ren <ren_guo@c-sky.com>
> > > Cc: Marc Zyngier <marc.zyngier@arm.com>
> > > Cc: Rob Herring <robh+dt@kernel.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.

It would be good to mention it anyway, if only for people to
understand what is happening with this changing binding.

Thanks,

	M.

-- 
Jazz is not dead, it just smell funny.