linux-kernel - Re: [PATCH 4/8] dt-bindings: arm: mediatek: Add new document bindings for APU

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Message-ID: <CAL_JsqLKaYY=NHm1hD=YaQgvDOBTtraoUqcycA7tu7n-f2GVDw@mail.gmail.com>
Date:   Thu, 15 Apr 2021 16:24:50 -0500
From:   Rob Herring <robh@...nel.org>
To:     Flora Fu <flora.fu@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Pi-Cheng Chen <pi-cheng.chen@...iatek.com>,
        Chiawen Lee <chiawen.lee@...iatek.com>,
        Chun-Jie Chen <chun-jie.chen@...iatek.com>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        linux-clk <linux-clk@...r.kernel.org>
Subject: Re: [PATCH 4/8] dt-bindings: arm: mediatek: Add new document bindings
 for APU

On Mon, Apr 12, 2021 at 1:45 AM Flora Fu <flora.fu@...iatek.com> wrote:
>
> On Fri, 2021-04-09 at 13:25 -0500, Rob Herring wrote:
> > On Wed, Apr 07, 2021 at 11:28:02AM +0800, Flora Fu wrote:
> > > Document the apusys bindings.
> > >
> > > Signed-off-by: Flora Fu <flora.fu@...iatek.com>
> > > ---
> > >  .../arm/mediatek/mediatek,apusys.yaml         | 56 +++++++++++++++++++
> > >  1 file changed, 56 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/arm/mediatek/mediatek,apusys.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/arm/mediatek/mediatek,apusys.yaml b/Documentation/devicetree/bindings/arm/mediatek/mediatek,apusys.yaml
> > > new file mode 100644
> > > index 000000000000..dc04a46f1bad
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/arm/mediatek/mediatek,apusys.yaml
> > > @@ -0,0 +1,56 @@
> > > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: https://urldefense.com/v3/__http://devicetree.org/schemas/arm/mediatek/mediatek,apusys.yaml*__;Iw!!CTRNKA9wMg0ARbw!3ryKFTA2CvsVss4Pt2ZOG7wv4jgR-2LPxuGn30IxFmpxoxSRdzNdf8FrAYYvZWcw$
> > > +$schema: https://urldefense.com/v3/__http://devicetree.org/meta-schemas/core.yaml*__;Iw!!CTRNKA9wMg0ARbw!3ryKFTA2CvsVss4Pt2ZOG7wv4jgR-2LPxuGn30IxFmpxoxSRdzNdf8FrARlhCQ0w$
> > > +
> > > +title: MediaTek APUSYS Controller
> > > +
> > > +maintainers:
> > > +  - Flora Fu <flora.fu@...iatek.com>
> > > +
> > > +description:
> > > +  The Mediatek apusys controller provides functional configurations and clocks
> > > +  to the system.
> > > +
> > > +properties:
> > > +  compatible:
> > > +    items:
> > > +      - enum:
> > > +          - mediatek,mt8192-apu_mbox
> > > +          - mediatek,mt8192-apu_conn
> > > +          - mediatek,mt8192-apu_vcore
> >
> > s/_/-/
> >
>
> OK. I will update expression strings in the next version.
>
> > > +      - const: syscon
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  '#clock-cells':
> > > +    const: 1
> > > +
> > > +required:
> > > +  - compatible
> > > +  - reg
> > > +
> > > +additionalProperties: false
> > > +
> > > +examples:
> > > +  - |
> > > +    apu_mbox: apu_mbox@...00000 {
> >
> > mailbox@...? Is this a mailbox provider?
> >
>
> Yes, the apu_mbox is the for setup mailbox in the APU hardware.

Then you need #mbox-cells here.

And in that case, what makes it a syscon?

>
> > > +        compatible = "mediatek,mt8192-apu_mbox", "syscon";
> > > +        reg = <0x19000000 0x1000>;
> > > +    };