linux-kernel - Re: [PATCH 4/7] media: dt-bindings: media: Add binding for the Raspberry Pi HEVC decoder

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Message-ID: <20241231131512.GA45470-robh@kernel.org>
Date: Tue, 31 Dec 2024 07:15:12 -0600
From: Rob Herring <robh@...nel.org>
To: Dave Stevenson <dave.stevenson@...pberrypi.com>
Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	John Cox <john.cox@...pberrypi.com>,
	Dom Cobley <dom@...pberrypi.com>,
	review list <kernel-list@...pberrypi.com>,
	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
	John Cox <jc@...esim.co.uk>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-rpi-kernel@...ts.infradead.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/7] media: dt-bindings: media: Add binding for the
 Raspberry Pi HEVC decoder

On Fri, Dec 20, 2024 at 04:21:15PM +0000, Dave Stevenson wrote:
> Adds a binding for the HEVC decoder found on the BCM2711 / Raspberry Pi 4,
> and BCM2712 / Raspberry Pi 5.
> 
> Signed-off-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
> ---
>  .../bindings/media/raspberrypi,hevc-dec.yaml       | 72 ++++++++++++++++++++++
>  1 file changed, 72 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/raspberrypi,hevc-dec.yaml b/Documentation/devicetree/bindings/media/raspberrypi,hevc-dec.yaml
> new file mode 100644
> index 000000000000..d9e804300297
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/media/raspberrypi,hevc-dec.yaml
> @@ -0,0 +1,72 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/media/raspberrypi,hevc-dec.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Raspberry Pi HEVC Decoder
> +
> +maintainers:
> +  - John Cox <john.cox@...pberrypi.com>
> +  - Dom Cobley <dom@...pberrypi.com>
> +  - Dave Stevenson <dave.stevenson@...pberrypi.com>
> +  - Raspberry Pi internal review list <kernel-list@...pberrypi.com>
> +
> +description: |-

Don't need '|-' if no formatting to preserve.

> +  The Raspberry Pi HEVC decoder is a hardware video decode accelerator block
> +  found in the BCM2711 and BCM2712 processors used on Raspberry Pi 4 and 5
> +  boards respectively.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - raspberrypi,hevc-dec
> +
> +  reg:
> +    items:
> +      - description: The HEVC main register region
> +      - description: The Interrupt control register region
> +
> +  reg-names:
> +    items:
> +      - const: intc
> +      - const: hevc

Doesn't match the description in reg.

> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: The HEVC block clock
> +
> +  clock-names:
> +    items:
> +      - const: hevc

Not really useful when there is only 1 possible entry and also when it 
is optional.

> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - interrupts
> +  - clocks
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    video-codec@...10000 {
> +        compatible = "raspberrypi,hevc-dec";
> +        reg = <0x7eb10000 0x1000>,	/* INTC */
> +              <0x7eb00000 0x10000>; /* HEVC */
> +        reg-names = "intc",
> +                    "hevc";
> +
> +        interrupts = <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>;
> +
> +        clocks = <&clk 0>;
> +        clock-names = "hevc";
> +    };
> +
> +...
> 
> -- 
> 2.34.1
>