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SubjectRe: [PATCH RFC v4 1/6] dt-bindings: display: add Unisoc's drm master bindings
On Wed, Feb 26, 2020 at 3:46 AM Kevin Tang <kevin3.tang@gmail.com> wrote:
>
> From: Kevin Tang <kevin.tang@unisoc.com>
>
> The Unisoc DRM master device is a virtual device needed to list all
> DPU devices or other display interface nodes that comprise the
> graphics subsystem
>
> Cc: Orson Zhai <orsonzhai@gmail.com>
> Cc: Baolin Wang <baolin.wang@linaro.org>
> Cc: Chunyan Zhang <zhang.lyra@gmail.com>
> Signed-off-by: Kevin Tang <kevin.tang@unisoc.com>
> ---
> .../devicetree/bindings/display/sprd/drm.yaml | 36 ++++++++++++++++++++++
> 1 file changed, 36 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/display/sprd/drm.yaml
>
> diff --git a/Documentation/devicetree/bindings/display/sprd/drm.yaml b/Documentation/devicetree/bindings/display/sprd/drm.yaml
> new file mode 100644
> index 0000000..b5792c0
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/sprd/drm.yaml
> @@ -0,0 +1,36 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/sprd/drm.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Unisoc DRM master device
> +
> +maintainers:
> + - Mark Rutland <mark.rutland@arm.com>
> +
> +description: |
> + The Unisoc DRM master device is a virtual device needed to list all
> + DPU devices or other display interface nodes that comprise the
> + graphics subsystem.
> +
> +properties:
> + compatible:
> + const: sprd,display-subsystem
> +
> + ports:
> + description:
> + Should contain a list of phandles pointing to display interface port
> + of DPU devices.
> +
> +required:
> + - compatible
> + - ports
> +
> +examples:
> + - |
> + display-subsystem {
> + compatible = "sprd,display-subsystem";
> + ports = <&dpu_out>;

We try to avoid these virtual nodes and bind with actual h/w nodes.
Can you have more than one DPU and if so does it need to be a single
DRM driver instance?

Rob

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