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Date:   Fri, 2 Jun 2023 19:21:47 +0100
From:   Conor Dooley <conor@kernel.org>
To:     Keith Zhao <keith.zhao@starfivetech.com>
Cc:     dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
        linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Emil Renner Berthing <kernel@esmil.dk>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Sumit Semwal <sumit.semwal@linaro.org>,
        christian.koenig@amd.com, Bjorn Andersson <andersson@kernel.org>,
        Heiko Stuebner <heiko@sntech.de>,
        Shawn Guo <shawnguo@kernel.org>, Jagan Teki <jagan@edgeble.ai>,
        Chris Morgan <macromorgan@hotmail.com>,
        Jack Zhu <jack.zhu@starfivetech.com>,
        Shengyang Chen <shengyang.chen@starfivetech.com>,
        Changhuang Liang <changhuang.liang@starfivetech.com>
Subject: Re: [PATCH 1/9] dt-bindings: display: Add yamls for JH7110 display
 subsystem
Message-ID: <20230602-uncommon-rejoicing-e73c0c475f9f@spud>
References: <20230602074043.33872-1-keith.zhao@starfivetech.com>
 <20230602074043.33872-2-keith.zhao@starfivetech.com>
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Hey Keith,

On Fri, Jun 02, 2023 at 03:40:35PM +0800, Keith Zhao wrote:
> Add bindings for JH7110 display subsystem which
> has a display controller verisilicon dc8200
> and an HDMI interface.
>=20
> Signed-off-by: Keith Zhao <keith.zhao@starfivetech.com>
> ---
>  .../display/verisilicon/starfive-hdmi.yaml    |  93 +++++++++++++++
>  .../display/verisilicon/verisilicon-dc.yaml   | 110 ++++++++++++++++++
>  .../display/verisilicon/verisilicon-drm.yaml  |  42 +++++++
>  .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
>  MAINTAINERS                                   |   7 ++
>  5 files changed, 254 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/verisilicon=
/starfive-hdmi.yaml
>  create mode 100644 Documentation/devicetree/bindings/display/verisilicon=
/verisilicon-dc.yaml
>  create mode 100644 Documentation/devicetree/bindings/display/verisilicon=
/verisilicon-drm.yaml
>=20
> diff --git a/Documentation/devicetree/bindings/display/verisilicon/starfi=
ve-hdmi.yaml b/Documentation/devicetree/bindings/display/verisilicon/starfi=
ve-hdmi.yaml
> new file mode 100644
> index 000000000000..c30b7954a355
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/verisilicon/starfive-hdmi=
=2Eyaml
> @@ -0,0 +1,93 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/verisilicon/starfive-hdmi.yam=
l#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: StarFive HDMI transmiter
> +
> +description:
> +  The StarFive SoC uses the HDMI signal transmiter based on innosilicon =
IP

Is innosilicon the same thing as verisilicon? Also
s/transmiter/transmitter/, both here and in the title.


> +  to generate HDMI signal from its input and transmit the signal to the =
screen.
> +
> +maintainers:
> +  - Keith Zhao <keith.zhao@starfivetech.com>
> +  - ShengYang Chen <shengyang.chen@starfivetech.com>
> +
> +properties:
> +  compatible:
> +    const: starfive,hdmi

Is this going to work on every SoC that StarFive has ever & will ever
make? Please use soc-based compatibles ;)

> +
> +  reg:
> +    minItems: 1
> +
> +  interrupts:
> +    items:
> +      - description: The HDMI hot plug detection interrupt.
> +
> +  clocks:
> +    items:
> +      - description: System clock of HDMI module.
> +      - description: Mclk clock of HDMI audio.
> +      - description: Bclk clock of HDMI audio.
> +      - description: Pixel clock generated by HDMI module.
> +
> +  clock-names:
> +    items:
> +      - const: sysclk
> +      - const: mclk
> +      - const: bclk
> +      - const: pclk
> +
> +  resets:
> +    items:
> +      - description: Reset for HDMI module.
> +
> +  reset-names:
> +    items:
> +      - const: hdmi_tx

You only have one item here, you don't need the "items: - const:",
"const:" alone will do.


> diff --git a/Documentation/devicetree/bindings/display/verisilicon/verisi=
licon-dc.yaml b/Documentation/devicetree/bindings/display/verisilicon/veris=
ilicon-dc.yaml
> new file mode 100644
> index 000000000000..1322502c4cde
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/verisilicon/verisilicon-d=
c.yaml
> @@ -0,0 +1,110 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/verisilicon/verisilicon-dc.ya=
ml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: StarFive display controller
> +
> +description:
> +  The StarFive SoC uses the display controller based on Verisilicon IP
> +  to transfer the image data from a video memory
> +  buffer to an external LCD interface.

Is it based on Verisilicon IP, or is it exactly that verisilicon IP? I
ask because...

> +maintainers:
> +  - Keith Zhao <keith.zhao@starfivetech.com>
> +  - ShengYang Chen <shengyang.chen@starfivetech.com>
> +
> +properties:
> +  compatible:
> +    const: verisilicon,dc8200

=2E..the compatible is the verisilicon IP. I would be a lot happier if
the compatibles were set yp for something like:
"starfive,jh7110-foo", "verisilicon,dc8200"

> diff --git a/Documentation/devicetree/bindings/display/verisilicon/verisi=
licon-drm.yaml b/Documentation/devicetree/bindings/display/verisilicon/veri=
silicon-drm.yaml
> new file mode 100644
> index 000000000000..aed8d4af2c55
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/verisilicon/verisilicon-d=
rm.yaml
> @@ -0,0 +1,42 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/verisilicon/verisilicon-drm.y=
aml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Verisilicon DRM master device
> +
> +maintainers:
> +  - Keith Zhao <keith.zhao@starfivetech.com>
> +  - ShengYang Chen <shengyang.chen@starfivetech.com>
> +
> +description: |
> +  The Verisilicon DRM master device is a virtual device needed to list a=
ll
> +  display controller or other display interface nodes that comprise the
> +  graphics subsystem.
> +
> +properties:
> +  compatible:
> +    const: verisilicon,display-subsystem

Same here.

> diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Doc=
umentation/devicetree/bindings/vendor-prefixes.yaml
> index 82d39ab0231b..52c04fd098be 100644
> --- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
> +++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
> @@ -1436,6 +1436,8 @@ patternProperties:
>      description: Variscite Ltd.
>    "^vdl,.*":
>      description: Van der Laan b.v.
> +  "^verisilicon,.*":
> +    description: Verisilicon Technologies, Inc.

This should be in it's own patch.

Cheers,
Conor.

>    "^vertexcom,.*":
>      description: Vertexcom Technologies, Inc.
>    "^via,.*":
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 2a0496448b7f..293aa13d484c 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -7049,6 +7049,13 @@ F:	Documentation/devicetree/bindings/display/brcm,=
bcm2835-*.yaml
>  F:	drivers/gpu/drm/vc4/
>  F:	include/uapi/drm/vc4_drm.h
> =20
> +DRM DRIVERS FOR VERISILICON
> +M:	Keith Zhao <keith.zhao@starfivetech.com>
> +L:	dri-devel@lists.freedesktop.org
> +S:	Maintained
> +T:	git git://anongit.freedesktop.org/drm/drm-misc
> +F:	Documentation/devicetree/bindings/display/verisilicon/
> +
>  DRM DRIVERS FOR VIVANTE GPU IP
>  M:	Lucas Stach <l.stach@pengutronix.de>
>  R:	Russell King <linux+etnaviv@armlinux.org.uk>
> --=20
> 2.34.1
>=20

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