Re: [PATCH 1/4] media: dt-bindings: Add Rockchip JPEG decoder

[Sascha Hauer]

On 2026-08-25 09:21, Krzysztof Kozlowski wrote:
> On 24/08/2026 09:01, Sascha Hauer wrote:
> > Add a devicetree binding schema for the JPEG hardware decoder Rockchip
> > integrates into a number of its SoCs.  Documents the single register
> > window (task registers plus the LLP link-table block at offset 0x300),
> > the decode interrupt, the aclk/hclk clocks, the AXI/AHB resets, the IOMMU
> > and the power domain.
> > 
> > The core is not tied to one SoC.  Downstream it is known as the VDPU720
> > and the same block sits on the RK3528, RK3562, RK356x, RK3576, RK3588 and
> > RV1126B, with only the clocks, the resets and the power domain differing,
> > none of which this schema constrains.  A compatible per SoC is all it
> > takes to cover them; the RK3568 and the RK3588 are the two that have been
> > tested and are enabled here.
> > 
> > The resets and the power domain are required.  The block cannot be
> > reached with its domain off, and the driver falls back to pulsing the
> > reset lines when a frame times out and the in-block soft reset does not
> > complete, which a node without them would leave with no way to recover.
> > 
> > The IOMMU stays optional.  The driver never refers to it, it is a platform
> > integration detail, and rockchip-vpu.yaml does not require it for the
> > other codec blocks on these SoCs either.
> > 
> > Assisted-by: Claude:claude-opus-5
> > ---
> >  .../bindings/media/rockchip,jpeg-decoder.yaml      | 92 ++++++++++++++++++++++
> >  MAINTAINERS                                        |  8 ++
> >  2 files changed, 100 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/media/rockchip,jpeg-decoder.yaml b/Documentation/devicetree/bindings/media/rockchip,jpeg-decoder.yaml
> > new file mode 100644
> > index 0000000000000..e20c1bf43ef3e
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/media/rockchip,jpeg-decoder.yaml
> > @@ -0,0 +1,92 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/media/rockchip,jpeg-decoder.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Rockchip JPEG Decoder
> > +
> > +maintainers:
> > +  - Lucas Sinn <lucas.sinn@xxxxxxxxxxxxxx>
> > +  - Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
> > +
> > +description:
> > +  Rockchip's in-house JPEG/MJPEG hardware decoder, known downstream as the
> > +  VDPU720.  The same core is integrated into a number of Rockchip SoCs, which
> > +  differ only in the clocks, resets and power domain they are wired to.  A
> > +  dedicated Link List Processor (LLP) register block, located at offset 0x300
> > +  within the same register window, allows the hardware to decode a chain of
> > +  frames autonomously ("link mode").
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - rockchip,rk3568-jpegd
> > +      - rockchip,rk3588-jpegd
> 
> How this can be v1 if you send VPU720 for rk3588 already?
> 
> https://lore.kernel.org/all/20260819-rk3588-jpegdec-v1-4-33d74cdf369c@xxxxxxxxxxxxxx/

The above has the JPEG decoder driver integrated into the hantro driver
which turned out to be the wrong abstraction, so I had to split this
series up into two, one for the Hantro fixes and one for the now
standalone JPEG decoder driver which is this series. I decided to start
freshly for both series instead of treating one as continuation of the
other.

> 
> Were there more versions?

No.

Sascha

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