linux-kernel - Re: [PATCH 2/3] media: dt-bindings: rockchip: Document RK3588 Video Decoder 2 bindings

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Date: Sat, 15 Jun 2024 15:49:21 -0400
From: Detlev Casanova <detlev.casanova@...labora.com>
To: Jonas Karlman <jonas@...boo.se>
Cc: linux-kernel@...r.kernel.org, Mauro Carvalho Chehab <mchehab@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Sebastian Reichel <sebastian.reichel@...labora.com>,
 Dragan Simic <dsimic@...jaro.org>, Alexey Charkov <alchark@...il.com>,
 Cristian Ciocaltea <cristian.ciocaltea@...labora.com>,
 Diederik de Haas <didi.debian@...ow.org>, Andy Yan <andy.yan@...k-chips.com>,
 linux-media@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org,
 linux-staging@...ts.linux.dev
Subject:
 Re: [PATCH 2/3] media: dt-bindings: rockchip: Document RK3588 Video Decoder 2
 bindings

On Saturday, June 15, 2024 4:11:00 A.M. EDT Jonas Karlman wrote:
> Hi Detlev,
> 
> On 2024-06-15 03:56, Detlev Casanova wrote:
> > Document the Rockchip RK3588 Video Decoder 2 bindings.
> 
> Why the need for a new schema file and not just extending existing
> rockchip,vdec.yaml with a new compatible and the new clock?

Yes, that can work as well indeed. I wasn't sure if different drivers could 
share a schema file.

> > Signed-off-by: Detlev Casanova <detlev.casanova@...labora.com>
> > ---
> > 
> >  .../bindings/media/rockchip,vdec2.yaml        | 80 +++++++++++++++++++
> >  1 file changed, 80 insertions(+)
> >  create mode 100644
> >  Documentation/devicetree/bindings/media/rockchip,vdec2.yaml> 
> > diff --git a/Documentation/devicetree/bindings/media/rockchip,vdec2.yaml
> > b/Documentation/devicetree/bindings/media/rockchip,vdec2.yaml new file
> > mode 100644
> > index 000000000000..e54891b46986
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/rockchip,vdec2.yaml
> > @@ -0,0 +1,80 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/media/rockchip,vdec2.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Rockchip Video Decoder 2 (VDec2)
> > +
> > +maintainers:
> > +  - Heiko Stuebner <heiko@...ech.de>
> > +
> > +description: |-
> > +  The Rockchip rk3588 has a stateless Video Decoder that can decodes
> > H.264, +  HEVC, VP9 and AVS2 streams.
> > +
> > +properties:
> > +  compatible:
> > +    const: rockchip,rk3588-vdec2
> 
> I fail to see the need to call this vdec2 instead of established vdec.
> 
> Suggest this is changed to rockchip,rk3588-vdec.

Wouldn't that be misleading if rockchip,rk3399-vdec and rockchip,rk3588-vdec 
use different drivers ?

> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    items:
> > +      - description: The Video decoder AXI interface clock
> > +      - description: The Video decoder AHB interface clock
> > +      - description: The Video decoder core clock
> > +      - description: The Video decoder CABAC clock
> > +      - description: The Video decoder HEVC CABAC clock
> > +
> > +  clock-names:
> > +    items:
> > +      - const: axi
> > +      - const: ahb
> > +      - const: core
> > +      - const: cabac
> > +      - const: hevc_cabac
> > +
> > +  assigned-clocks: true
> > +
> > +  assigned-clock-rates: true
> > +
> > +  power-domains:
> > +    maxItems: 1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - clocks
> > +  - clock-names
> > +  - power-domains
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +    #include <dt-bindings/clock/rockchip,rk3588-cru.h>
> > +    #include <dt-bindings/power/rk3588-power.h>
> > +
> > +    vdec2: video-codec@...38100 {
> > +        compatible = "rockchip,rk3588-vdec2";
> > +        reg = <0x0 0xfdc38100 0x0 0x500>;
> > +        interrupts = <GIC_SPI 95 IRQ_TYPE_LEVEL_HIGH 0>;
> > +        clocks = <&cru ACLK_RKVDEC0>, <&cru HCLK_RKVDEC0>, <&cru
> > CLK_RKVDEC0_CORE>, +                 <&cru CLK_RKVDEC0_CA>, <&cru
> > CLK_RKVDEC0_HEVC_CA>; +        clock-names = "axi", "ahc", "core",
> > +                      "cabac", "hevc_cabac";
> > +        assigned-clocks = <&cru ACLK_RKVDEC0>, <&cru CLK_RKVDEC0_CORE>,
> > +                          <&cru CLK_RKVDEC0_CA>, <&cru
> > CLK_RKVDEC0_HEVC_CA>; +        assigned-clock-rates = <800000000>,
> > <600000000>,
> > +                               <600000000>, <1000000000>;
> > +        power-domains = <&power RK3588_PD_RKVDEC0>;
> 
> iommus and resets seem to be missing?

Indeed, even if their are not used yet, I'd make sens to already have them 
here to stabilize the device tree, right ?

> Regards,
> Jonas
> 
> > +    };
> > +
> > +...


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