Re: [PATCH v2 02/12] dt-bindings: media: qcom,sm8550-iris: Add context bank subnodes

[Dmitry Baryshkov]

On Fri, Jul 31, 2026 at 03:36:51PM -0500, Rob Herring (Arm) wrote:
> On Fri, 31 Jul 2026 23:52:17 +0530, Vikash Garodia wrote:
> > The VPU issues DMA through several SMMU streams, and the hardware does
> > not give every stream the same addressable range. The non-pixel stream
> > is restricted to use 0-600MB of IOVA space, while the pixel stream can
> > address the full range:
> > 
> > Fixes: 41661853ae8e ("arm64: dts: qcom: sm8550: add iris DT node")
> > Cc: stable@xxxxxxxxxxxxxxx
> > Co-developed-by: Vishnu Reddy <busanna.reddy@xxxxxxxxxxxxxxxx>
> > Signed-off-by: Vishnu Reddy <busanna.reddy@xxxxxxxxxxxxxxxx>
> > Tested-by: Daniel J Blueman <daniel@xxxxxxxxx>
> > Signed-off-by: Vikash Garodia <vikash.garodia@xxxxxxxxxxxxxxxx>
> > ---
> >  .../devicetree/bindings/media/qcom,sm8550-iris.yaml    | 18 +++++++++++++++---
> >  1 file changed, 15 insertions(+), 3 deletions(-)
> > 
> 
> My bot found errors running 'make dt_binding_check' on your patch:
> 
> yamllint warnings/errors:
> 
> dtschema/dtc warnings/errors:
> Documentation/devicetree/bindings/media/qcom,sm8550-iris.example.dts:67.13-24: Warning (dma_ranges_format): /example-0/video-codec@aa00000:dma-ranges: empty "dma-ranges" property but its #address-cells (2) differs from /example-0 (1)
> Documentation/devicetree/bindings/media/qcom,sm8550-iris.example.dts:67.13-24: Warning (dma_ranges_format): /example-0/video-codec@aa00000:dma-ranges: empty "dma-ranges" property but its #size-cells (2) differs from /example-0 (1)

Vikash, you promised to verify the examples. What has happened?

Also, does it make any sense to you? The device in the example has
32-bit addressing, now you state that _subdevices_ have 64-bit
addressing. Why? How are those 64 bits mapped to the parent 32 bits?

> 
> doc reference errors (make refcheckdocs):
> 

-- 
With best wishes
Dmitry