linux-kernel - Re: [PATCH V3 22/26] dt-bindings: interrupt-controller: C-SKY SMP intc

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Date:   Thu, 6 Sep 2018 10:23:22 +0800
From:   Guo Ren <ren_guo@...ky.com>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-arch@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Jason Cooper <jason@...edaemon.net>,
        Arnd Bergmann <arnd@...db.de>, c-sky_gcc_upstream@...ky.com,
        gnu-csky@...tor.com, thomas.petazzoni@...tlin.com,
        wbx@...ibc-ng.org, Greentime Hu <green.hu@...il.com>
Subject: Re: [PATCH V3 22/26] dt-bindings: interrupt-controller: C-SKY SMP
 intc

On Wed, Sep 05, 2018 at 07:45:12PM -0500, Rob Herring wrote:
> On Wed, Sep 5, 2018 at 7:09 AM Guo Ren <ren_guo@...ky.com> wrote:
> >
> > Signed-off-by: Guo Ren <ren_guo@...ky.com>
> > ---
> >  .../bindings/interrupt-controller/csky,mpintc.txt  | 40 ++++++++++++++++++++++
> >  1 file changed, 40 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt
> >
> > diff --git a/Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt b/Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt
> > new file mode 100644
> > index 0000000..49d1658
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/interrupt-controller/csky,mpintc.txt
> > @@ -0,0 +1,40 @@
> > +===========================================
> > +C-SKY Multi-processors Interrupt Controller
> > +===========================================
> > +
> > +C-SKY Multi-processors Interrupt Controller is designed for ck807/ck810/ck860
> > +SMP soc, and it also could be used in non-SMP system.
> 
> How is it accessed? No mmio registers?
Mmio reg base is got from cpu-coprocessor register and I'll detail
it here in next version patch.

csky_mpintc_init(struct device_node *node, struct device_node *parent)
{
	...
	INTCG_base = ioremap(mfcr("cr<31, 14>"), INTC_SIZE);