linux-kernel - Re: [PATCH v4 02/17] dt-bindings: gpu: Add Imagination Technologies PowerVR GPU

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Date:   Tue, 18 Jul 2023 11:08:05 +0000
From:   Frank Binns <Frank.Binns@...tec.com>
To:     "conor@...nel.org" <conor@...nel.org>,
        Sarah Walker <Sarah.Walker@...tec.com>
CC:     "luben.tuikov@....com" <luben.tuikov@....com>,
        "christian.koenig@....com" <christian.koenig@....com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "tzimmermann@...e.de" <tzimmermann@...e.de>,
        "mripard@...nel.org" <mripard@...nel.org>,
        "matthew.brost@...el.com" <matthew.brost@...el.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "hns@...delico.com" <hns@...delico.com>,
        "maarten.lankhorst@...ux.intel.com" 
        <maarten.lankhorst@...ux.intel.com>,
        "boris.brezillon@...labora.com" <boris.brezillon@...labora.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "afd@...com" <afd@...com>, "dakr@...hat.com" <dakr@...hat.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "airlied@...il.com" <airlied@...il.com>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "Donald Robson" <Donald.Robson@...tec.com>,
        "faith.ekstrand@...labora.com" <faith.ekstrand@...labora.com>
Subject: Re: [PATCH v4 02/17] dt-bindings: gpu: Add Imagination Technologies
 PowerVR GPU

Hi Conor,

Thank you for your feedback (comments below).

On Sat, 2023-07-15 at 11:40 +0100, Conor Dooley wrote:
> Hey Sarah,
> 
> Your series does not appear to be threaded. `git send-email` can be
> passed, for example, a directory containing a whole series & will set
> the correct in-reply-to headers so that the series is in a single
> thread.

Thank you pointing this out, we'll make sure we do this for the next iteration.

> 
> On Fri, Jul 14, 2023 at 03:25:26PM +0100, Sarah Walker wrote:
> > Add the device tree binding documentation for the Series AXE GPU used in
> > TI AM62 SoCs.
> > Changes since v3:
> > - Remove oneOf in compatible property
> > - Remove power-supply (not used on AM62)
> > 
> > Changes since v2:
> > - Add commit message description
> > - Remove mt8173-gpu support (not currently supported)
> > - Drop quotes from $id and $schema
> > - Remove reg: minItems
> > - Drop _clk suffixes from clock-names
> > - Remove operating-points-v2 property and cooling-cells (not currently
> >   used)
> > - Add additionalProperties: false
> > - Remove stray blank line at the end of file
> 
> The changelog should go below the --- line.

Ack

> 
> > Signed-off-by: Sarah Walker <sarah.walker@...tec.com>
> > ---
> >  .../devicetree/bindings/gpu/img,powervr.yaml  | 68 +++++++++++++++++++
> >  MAINTAINERS                                   |  7 ++
> >  2 files changed, 75 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/gpu/img,powervr.yaml
> > diff --git a/Documentation/devicetree/bindings/gpu/img,powervr.yaml b/Documentation/devicetree/bindings/gpu/img,powervr.yaml
> > new file mode 100644
> > index 000000000000..3292a0440465
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/gpu/img,powervr.yaml
> > @@ -0,0 +1,68 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +# Copyright (c) 2022 Imagination Technologies Ltd.
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/gpu/img,powervr.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Imagination Technologies PowerVR GPU
> > +
> > +maintainers:
> > +  - Sarah Walker <sarah.walker@...tec.com>
> > +  interrupts:
> > +    items:
> > +      - description: GPU interrupt
> 
> The description here doesn't add any value, since there is only one
> interrupt, so you can drop it and do maxItems: 1 as you have done
> elsewhere.

Sure, will make this change.

> 
> > +  interrupt-names:
> > +    items:
> > +      - const: gpu
> 
> And this
> items:
>   - const: gpu
> can just be
> const: gpu
> 
> Although, if there is only one interrupt this is probably not
> particularly helpful. Are there other implementations of this IP that
> have more interrupts?

No, all our current GPUs just have a single interrupt. I assume it's more future
proof to keep the name in case that ever changes? As in, by having the name now
we can make it a required property, which I guess we won't be able to do at some
later point.

Thanks
Frank

> 
> Otherwise, this looks good to me.
> 
> Thanks,
> Conor.