linux-kernel - Re: [PATCH v4 1/2] dt-bindings: Add bindings for BrcmSTB SCMI mailbox driver

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Message-ID: <CA+-6iNw1Z1dj8oFn8DdyVPuMUP-3+n9sKXuWYWo2rfPo5j4dkA@mail.gmail.com>
Date:   Wed, 4 Nov 2020 17:03:55 -0500
From:   Jim Quinlan <james.quinlan@...adcom.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 1/2] dt-bindings: Add bindings for BrcmSTB SCMI mailbox driver

On Wed, Nov 4, 2020 at 4:50 PM Rob Herring <robh@...nel.org> wrote:
>
> On Thu, Oct 29, 2020 at 03:59:06PM -0400, Jim Quinlan wrote:
> > Bindings are added.  Only one interrupt is needed because
> > we do not yet employ the SCMI p2a channel.
>
> I still don't understand what this is. To repeat from v1: I thought SCMI
> was a mailbox consumer, not provider?

Hi Rob,

I'm not sure where I am implying that SCMI is a mailbox provider?
Should I not mention "SCMI" in the subject line?

This is just a mailbox driver, "consumed" by SCMI.    Our SCMI DT node
looks like this:

brcm_scmi_mailbox: brcm_scmi_mailbox@0 {
        #mbox-cells = <1>;
        compatible = "brcm,brcmstb-mbox";
};

brcm_scmi@0 {
        compatible = "arm,scmi";
        mboxes = <&brcm_scmi_mailbox 0>;;
        mbox-names = "tx";
        shmem = <&NWMBOX>;
        /* ... */
};

Please advise,
Jim Quinlan
Broadcom STB

>
> >
> > Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>
> > ---
> >  .../bindings/mailbox/brcm,brcmstb-mbox.yaml   | 39 +++++++++++++++++++
> >  1 file changed, 39 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/mailbox/brcm,brcmstb-mbox.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/mailbox/brcm,brcmstb-mbox.yaml b/Documentation/devicetree/bindings/mailbox/brcm,brcmstb-mbox.yaml
> > new file mode 100644
> > index 000000000000..797c0cc609a3
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/mailbox/brcm,brcmstb-mbox.yaml
> > @@ -0,0 +1,39 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> > +$id: http://devicetree.org/schemas/mailbox/brcm,brcmstb-mbox.yaml#
> > +
> > +title: Broadcom STB mailbox driver bindings
> > +
> > +maintainers:
> > +  - Jim Quinlan <james.quinlan@...adcom.com>
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - brcm,brcmstb-mbox
> > +
> > +  interrupts:
> > +    items:
> > +      - description: a2p return interrupt, indicates SCMI msg completion.
> > +
> > +  "#mbox-cells":
> > +    const: 1
> > +
> > +required:
> > +  - compatible
> > +  - interrupts
> > +  - "#mbox-cells"
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +    mailbox {
> > +      compatible = "brcm,brcmstb-mailbox";
> > +      #mbox-cells = <1>;
> > +      interrupts = <GIC_SPI 0xc6 IRQ_TYPE_LEVEL_HIGH>;
> > +    };
> > +...
> > --
> > 2.17.1
> >
>
>

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