linux-kernel - Re: [PATCH v2 3/6] dt-bindings: soc: mobileye: add EyeQ5 OLB system controller

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Message-ID: <20240109034410.GA2585123-robh@kernel.org>
Date: Mon, 8 Jan 2024 20:44:10 -0700
From: Rob Herring <robh@...nel.org>
To: Théo Lebrun <theo.lebrun@...tlin.com>
Cc: Gregory CLEMENT <gregory.clement@...tlin.com>, Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>, Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>, linux-mips@...r.kernel.org, linux-clk@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, Thomas Petazzoni <thomas.petazzoni@...tlin.com>, Tawfik Bayouk <tawfik.bayouk@...ileye.com>
Subject: Re: [PATCH v2 3/6] dt-bindings: soc: mobileye: add EyeQ5 OLB system
 controller

On Thu, Dec 28, 2023 at 03:57:55PM +0100, Théo Lebrun wrote:
> Hello,
> 
> On Wed Dec 27, 2023 at 7:27 PM CET, Rob Herring wrote:
> > On Wed, Dec 27, 2023 at 10:24 AM Théo Lebrun <theo.lebrun@...tlin.com> wrote:
> > >
> > > Add documentation to describe the "Other Logic Block" syscon.
> > >
> > > Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
> > > ---
> > >  .../bindings/soc/mobileye/mobileye,eyeq5-olb.yaml  | 44 ++++++++++++++++++++++
> > >  MAINTAINERS                                        |  1 +
> > >  2 files changed, 45 insertions(+)
> > >
> > > diff --git a/Documentation/devicetree/bindings/soc/mobileye/mobileye,eyeq5-olb.yaml b/Documentation/devicetree/bindings/soc/mobileye/mobileye,eyeq5-olb.yaml
> > > new file mode 100644
> > > index 000000000000..b148a49b08f1
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/soc/mobileye/mobileye,eyeq5-olb.yaml
> > > @@ -0,0 +1,44 @@
> > > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/soc/mobileye/mobileye,eyeq5-olb.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Mobileye EyeQ5 SoC system controller
> > > +
> > > +maintainers:
> > > +  - Grégory Clement <gregory.clement@...tlin.com>
> > > +  - Théo Lebrun <theo.lebrun@...tlin.com>
> > > +  - Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>
> > > +
> > > +description:
> > > +  OLB ("Other Logic Block") is a hardware block grouping smaller blocks. Clocks,
> > > +  resets, pinctrl are being handled from here.
> >
> > I don't see resets or pinctrl in the binding. Please make it complete
> > whether you have the driver or not.
> >
> > As-is, you don't need clocks to be a child node.
> 
> Will do. Would it make sense to have the three drivers be a single
> series? 

You could, but doesn't have to be. Just make the binding complete. 
Whether you have the drivers done is up to you.

> Else we could have the dt-bindings be part of the base platform
> support series[1].
> 
> [1]: https://lore.kernel.org/lkml/20231212163459.1923041-1-gregory.clement@bootlin.com/
> 
> > > +properties:
> > > +  compatible:
> > > +    items:
> > > +      - const: mobileye,eyeq5-olb
> > > +      - const: syscon
> > > +      - const: simple-mfd
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  reg-io-width:
> > > +    const: 4
> >
> > Why do you need this? It is not a generic block and can only ever be 1
> > value.
> 
> This block is still a syscon in the end. I wanted to explicit that
> access width must be 4 bytes and nothing else.
> 
> Does you question mean you think I should be removing it?

Yes. It can be implied by compatible.

Rob