linux-kernel - Re: [PATCH v2 3/5] media: dt-bindings: media: Add binding for the Raspberry Pi HEVC decoder

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Message-ID: <CAPY8ntD3Frq5HzV06OrS1051QfjJFzvqs9H4mUkVnd4QKqiMhg@mail.gmail.com>
Date: Wed, 12 Feb 2025 15:29:50 +0000
From: Dave Stevenson <dave.stevenson@...pberrypi.com>
To: Rob Herring <robh@...nel.org>
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 v2 3/5] media: dt-bindings: media: Add binding for the
 Raspberry Pi HEVC decoder

Hi Rob

On Tue, 11 Feb 2025 at 22:20, Rob Herring <robh@...nel.org> wrote:
>
> On Thu, Feb 06, 2025 at 06:02:36PM +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       | 67 ++++++++++++++++++++++
> >  1 file changed, 67 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..06db7004c765
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/raspberrypi,hevc-dec.yaml
> > @@ -0,0 +1,67 @@
> > +# 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:
> > +  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
>
> SoC specific compatible please. If they are 'the same' then 2712 can
> fallback to 2711.

Can I just make sure I understand your request before I respin?
This is a Raspberry Pi IP block that has been added to the Broadcom
SoCs. It's the same situation as for PiSP Backend which is documented
in bindings/media/raspberrypi,pisbe.yaml

Based on that I'm interpreting your comment as wanting:

properties:
  compatible:
    items:
      - enum:
          - brcm,bcm2711-hevc-dec
          - brcm,bcm2712-hevc-dec
      - const: raspberrypi,hevc-dec

Is that right?

Thanks
  Dave

> > +
> > +  reg:
> > +    items:
> > +      - description: The HEVC main register region
> > +      - description: The Interrupt control register region
> > +
> > +  reg-names:
> > +    items:
> > +      - const: hevc
> > +      - const: intc
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    items:
> > +      - description: The HEVC block clock
> > +
> > +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 = <0x7eb00000 0x10000>, /* HEVC */
> > +              <0x7eb10000 0x1000>;  /* INTC */
> > +        reg-names = "hevc",
> > +                    "intc";
> > +
> > +        interrupts = <GIC_SPI 98 IRQ_TYPE_LEVEL_HIGH>;
> > +
> > +        clocks = <&clk 0>;
> > +    };
> > +
> > +...
> >
> > --
> > 2.34.1
> >