Re: [PATCH v2 2/4] dt-bindings: misc: Aspeed coprocessor interrupt controller

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Wed, 2018-06-20 at 13:49 -0600, Rob Herring wrote:
> On Mon, Jun 18, 2018 at 02:59:00PM +1000, Benjamin Herrenschmidt wrote:
> > Add the device-tree binding definition for the AST2400
> > and AST2500 coprocessor interrupt controller
> > 
> > Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> > ---
> >  .../devicetree/bindings/misc/aspeed,cvic.txt  | 35 +++++++++++++++++++
> >  1 file changed, 35 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/misc/aspeed,cvic.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/misc/aspeed,cvic.txt b/Documentation/devicetree/bindings/misc/aspeed,cvic.txt
> > new file mode 100644
> > index 000000000000..2562e2991e4d
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/misc/aspeed,cvic.txt
> > @@ -0,0 +1,35 @@
> > +* Aspeed AST2400 and AST2500 coprocessor interrupt controller
> > +
> > +This file describes the bindings for the interrupt controller present
> > +in the AST2400 and AST2500 BMC SoCs which provides interrupt to the
> > +ColdFire coprocessor.
> > +
> > +It is not a normal interrupt controller and it would be rather
> > +inconvenient to create an interrupt tree for it as it somewhat shares
> > +some of the same sources as the main ARM interrupt controller but with
> > +different numbers.
> > +
> > +The AST2500 supports a SW generated interrupt
> > +
> > +Required properties:
> > +- reg: address and length of the register for the device.
> > +- compatible: "aspeed,cvic" and one of:
> > +		"aspeed,ast2400-cvic"
> > +	      or
> > +		"aspeed,ast2500-cvic"
> > +
> > +- valid-sources: One cell, bitmap of supported sources for the implementation
> 
> aspeed,valid-sources
> 
> This could use a better description. I thought this was which bits to 
> use for s/w irq, but then I read the next property...
> 
> Alternatively, why can't this be implied by the compatible?

It could, I'm happy to drop it, I don't actually use it in SW.

Cheers,
Ben.

> > +
> > +Optional properties;
> > +- copro-sw-interrupts: List of interrupt numbers that can be used as
> > +		       SW interrupts from the ARM to the coprocessor.
> > +		       (AST2500 only)
> > +
> > +Example:
> > +
> > +	cvic: copro-interrupt-controller@1e6c2000 {
> > +		compatible = "aspeed,ast2500-cvic";
> > +		valid-sources = <0xffffffff>;
> > +		copro-sw-interrupts = <1>;
> > +		reg = <0x1e6c2000 0x80>;
> > +	};
> > -- 
> > 2.17.1
> > 
> > 
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