[PATCH v2 1/3] dt-bindings: Add YAML bindings for Host1x and NVDEC
Thierry Reding
thierry.reding at gmail.com
Tue Aug 10 15:43:26 UTC 2021
On Fri, Aug 06, 2021 at 03:34:48PM +0300, Mikko Perttunen wrote:
> Convert the original Host1x bindings to YAML and add new bindings for
> NVDEC, now in a more appropriate location. The old text bindings
> for Host1x and engines are still kept at display/tegra/ since they
> encompass a lot more engines that haven't been converted over yet.
>
> Signed-off-by: Mikko Perttunen <mperttunen at nvidia.com>
> ---
> v2:
> * Fix issues pointed out in v1
> * Add T194 nvidia,instance property
> ---
> .../gpu/host1x/nvidia,tegra20-host1x.yaml | 131 ++++++++++++++++++
> .../gpu/host1x/nvidia,tegra210-nvdec.yaml | 109 +++++++++++++++
> MAINTAINERS | 1 +
> 3 files changed, 241 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/gpu/host1x/nvidia,tegra20-host1x.yaml
> create mode 100644 Documentation/devicetree/bindings/gpu/host1x/nvidia,tegra210-nvdec.yaml
Can we split off the NVDEC bindings addition into a separate patch? I've
been working on converting the existing host1x bindings in full to json-
schema and this partial conversion would conflict with that effort.
I assume that NVDEC itself validates properly even if host1x hasn't been
converted yet?
> diff --git a/Documentation/devicetree/bindings/gpu/host1x/nvidia,tegra210-nvdec.yaml b/Documentation/devicetree/bindings/gpu/host1x/nvidia,tegra210-nvdec.yaml
> new file mode 100644
> index 000000000000..fc535bb7aee0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpu/host1x/nvidia,tegra210-nvdec.yaml
> @@ -0,0 +1,109 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/gpu/host1x/nvidia,tegra210-nvdec.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Device tree binding for NVIDIA Tegra NVDEC
> +
> +description: |
> + NVDEC is the hardware video decoder present on NVIDIA Tegra210
> + and newer chips. It is located on the Host1x bus and typically
> + programmed through Host1x channels.
> +
> +maintainers:
> + - Thierry Reding <treding at gmail.com>
> + - Mikko Perttunen <mperttunen at nvidia.com>
> +
> +properties:
> + $nodename:
> + pattern: "^nvdec@[0-9a-f]*$"
> +
> + compatible:
> + enum:
> + - nvidia,tegra210-nvdec
> + - nvidia,tegra186-nvdec
> + - nvidia,tegra194-nvdec
> +
> + reg:
> + maxItems: 1
> +
> + clocks:
> + maxItems: 1
> +
> + clock-names:
> + items:
> + - const: nvdec
> +
> + resets:
> + maxItems: 1
> +
> + reset-names:
> + items:
> + - const: nvdec
> +
> + power-domains:
> + maxItems: 1
> +
> + iommus:
> + maxItems: 1
> +
> + interconnects:
> + items:
> + - description: DMA read memory client
> + - description: DMA read 2 memory client
> + - description: DMA write memory client
> +
> + interconnect-names:
> + items:
> + - const: dma-mem
> + - const: read2
The convention that we've used so far has been to start numbering these
at 0 and use a dash, so this would be "read-1".
> + - const: write
> +
> +required:
> + - compatible
> + - reg
> + - clocks
> + - clock-names
> + - resets
> + - reset-names
> + - power-domains
> +
> +if:
> + properties:
> + compatible:
> + contains:
> + const: nvidia,tegra194-host1x
> +then:
> + properties:
> + nvidia,instance:
> + items:
> + - description: 0 for NVDEC0, or 1 for NVDEC1
I know we had discussed this before, but looking at the driver patch, I
don't actually see this being used now, so I wonder if we still need it.
> +additionalProperties: true
Maybe this should have a comment noting that this should really be
unevaluatedProperties: false, but we can't use that because the tooling
doesn't support it yet?
Rob, what's the current best practice for that? I see that there are
quite a few bindings that use unevaluatedProperties, so I wonder if we
just ignore errors from that for now? Or do we have some development
branch of the tooling somewhere that supports this now? I vaguely recall
reading about work in progress patches for this, but I can't find the
link now to see if there's been an update since I last looked.
Thierry
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