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From: Rob Herring <robh@kernel.org>
To: Sameer Pujar <spujar@nvidia.com>
Cc: alsa-devel@alsa-project.org, kuninori.morimoto.gx@renesas.com,
	atalambedu@nvidia.com, linux-kernel@vger.kernel.org,
	thierry.reding@gmail.com, rlokhande@nvidia.com,
	swarren@nvidia.com, tiwai@suse.com,
	pierre-louis.bossart@linux.intel.com, jonathanh@nvidia.com,
	devicetree@vger.kernel.org, nicoleotsuka@gmail.com,
	broonie@kernel.org, linux-tegra@vger.kernel.org,
	mkumard@nvidia.com, viswanathl@nvidia.com, lgirdwood@gmail.com,
	nwartikar@nvidia.com, p.zabel@pengutronix.de, sharadg@nvidia.com,
	dramesh@nvidia.com
Subject: Re: [PATCH v4 08/15] Documentation: of: Convert graph bindings to json-schema
Date: Mon, 19 Oct 2020 16:56:28 -0500
Message-ID: <20201019215628.GA3650804@bogus> (raw)
In-Reply-To: <1602859382-19505-9-git-send-email-spujar@nvidia.com>

On Fri, Oct 16, 2020 at 08:12:55PM +0530, Sameer Pujar wrote:
> Convert device tree bindings of graph to YAML format.

Thanks for doing this.

> Signed-off-by: Sameer Pujar <spujar@nvidia.com>
> Cc: Philipp Zabel <p.zabel@pengutronix.de>
> ---
>  Documentation/devicetree/bindings/graph.txt  | 128 --------------------
>  Documentation/devicetree/bindings/graph.yaml | 170 +++++++++++++++++++++++++++
>  2 files changed, 170 insertions(+), 128 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/graph.txt
>  create mode 100644 Documentation/devicetree/bindings/graph.yaml

I'd like to move this to the dtschema repository instead.

> diff --git a/Documentation/devicetree/bindings/graph.yaml b/Documentation/devicetree/bindings/graph.yaml
> new file mode 100644
> index 0000000..67804c1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/graph.yaml
> @@ -0,0 +1,170 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

As the original text defaulted to GPL2, this needs Philipp's permission 
to re-license.

> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/graph.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Common bindings for device graphs
> +
> +description: |
> +  The hierarchical organisation of the device tree is well suited to describe
> +  control flow to devices, but there can be more complex connections between
> +  devices that work together to form a logical compound device, following an
> +  arbitrarily complex graph.
> +  There already is a simple directed graph between devices tree nodes using
> +  phandle properties pointing to other nodes to describe connections that
> +  can not be inferred from device tree parent-child relationships. The device
> +  tree graph bindings described herein abstract more complex devices that can
> +  have multiple specifiable ports, each of which can be linked to one or more
> +  ports of other devices.
> +
> +  These common bindings do not contain any information about the direction or
> +  type of the connections, they just map their existence. Specific properties
> +  may be described by specialized bindings depending on the type of connection.
> +
> +  To see how this binding applies to video pipelines, for example, see
> +  Documentation/devicetree/bindings/media/video-interfaces.txt.
> +  Here the ports describe data interfaces, and the links between them are
> +  the connecting data buses. A single port with multiple connections can
> +  correspond to multiple devices being connected to the same physical bus.
> +
> +maintainers:
> +  - Philipp Zabel <p.zabel@pengutronix.de>
> +
> +definitions:
> +
> +  port:
> +    type: object
> +    description: |
> +      If there is more than one 'port' or more than one 'endpoint' node
> +      or 'reg' property present in the port and/or endpoint nodes then
> +      '#address-cells' and '#size-cells' properties are required in relevant
> +      parent node.

reg property.

> +
> +    patternProperties:
> +      "^endpoint(@[0-9a-f]+)?$":
> +        type: object
> +        properties:

reg?

> +          remote-endpoint:
> +            description: |
> +              phandle to an 'endpoint' subnode of a remote device node.
> +            $ref: /schemas/types.yaml#/definitions/phandle
> +
> +  ports:
> +    type: object
> +    patternProperties:
> +      "^port(@[0-9a-f]+)?$":
> +        $ref: "#/definitions/port"

No reason for this to be under 'definitions'. Just move down.

> +
> +properties:
> +  ports:
> +    $ref: "#/definitions/ports"
> +
> +patternProperties:
> +  "^port(@[0-9a-f]+)?$":
> +    $ref: "#/definitions/port"
> +
> +additionalProperties: false

This needs to be true here. But you need this within 'ports' and 'port'. 
(I think... I think we only have extra properties within endpoint 
nodes.) 

> +
> +examples:
> +  # Organisation of ports and endpoints:
> +  #
> +  # Ports are described by child 'port' nodes contained in the device node.
> +  # Each port node contains an 'endpoint' subnode for each remote device port
> +  # connected to this port. If a single port is connected to more than one
> +  # remote device, an 'endpoint' child node must be provided for each link.
> +  # If more than one port is present in a device node or there is more than
> +  # one endpoint at a port, or a port node needs to be associated with a
> +  # selected hardware interface, a common scheme using '#address-cells',
> +  # '#size-cells' and 'reg' properties is used to number the nodes.
> +  - |
> +    device {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        port@0 {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +            reg = <0>;
> +
> +            endpoint@0 {
> +                reg = <0>;
> +                // ...
> +            };
> +            endpoint@1 {
> +                reg = <1>;
> +                // ...
> +            };
> +        };
> +
> +        port@1 {
> +            reg = <1>;
> +
> +            endpoint {
> +                // ...
> +            };
> +        };
> +    };
> +
> +  # All 'port' nodes can be grouped under an optional 'ports' node, which
> +  # allows to specify #address-cells, #size-cells properties for the 'port'
> +  # nodes independently from any other child device nodes a device might
> +  # have.
> +  - |
> +    device {
> +        // ...
> +        ports {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            port@0 {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                reg = <0>;
> +                // ...
> +
> +                endpoint@0 {
> +                    reg = <0>;
> +                    // ...
> +                };
> +                endpoint@1 {
> +                    reg = <1>;
> +                    // ...
> +                };
> +            };
> +
> +            port@1 {
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +                reg = <1>;
> +                // ...
> +            };
> +        };
> +    };
> +
> +  # Links between endpoints:
> +  #
> +  # Each endpoint should contain a 'remote-endpoint' phandle property that
> +  # points to the corresponding endpoint in the port of the remote device.
> +  # In turn, the remote endpoint should contain a 'remote-endpoint' property.
> +  # If it has one, it must not point to anything other than the local endpoint.
> +  # Two endpoints with their 'remote-endpoint' phandles pointing at each other
> +  # form a link between the containing ports.
> +  - |
> +    device-1 {
> +        port {
> +            device_1_output: endpoint {
> +                remote-endpoint = <&device_2_input>;
> +            };
> +        };
> +    };
> +
> +    device-2 {
> +        port {
> +            device_2_input: endpoint {
> +                remote-endpoint = <&device_1_output>;
> +            };
> +        };
> +    };
> +
> +...
> -- 
> 2.7.4
> 

  reply index

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-16 14:42 [PATCH v4 00/15] Audio graph card updates and usage with Tegra210 audio Sameer Pujar
2020-10-16 14:42 ` [PATCH v4 01/15] ASoC: soc-core: Fix component name_prefix parsing Sameer Pujar
2020-10-16 14:42 ` [PATCH v4 02/15] ASoC: soc-pcm: Get all BEs along DAPM path Sameer Pujar
2020-10-16 14:42 ` [PATCH v4 03/15] ASoC: audio-graph: Use of_node and DAI for DPCM DAI link names Sameer Pujar
2020-10-16 14:42 ` [PATCH v4 04/15] ASoC: audio-graph: Identify 'no_pcm' DAI links for DPCM Sameer Pujar
2020-10-16 14:42 ` [PATCH v4 05/15] ASoC: audio-graph: Support empty Codec endpoint Sameer Pujar
2020-10-16 14:42 ` [PATCH v4 06/15] ASoC: audio-graph: Expose new members for asoc_simple_priv Sameer Pujar
2020-10-16 14:42 ` [PATCH v4 07/15] ASoC: audio-graph: Expose helpers from audio graph Sameer Pujar
2020-10-16 14:42 ` [PATCH v4 08/15] Documentation: of: Convert graph bindings to json-schema Sameer Pujar
2020-10-19 21:56   ` Rob Herring [this message]
2020-10-20  5:34     ` Sameer Pujar
2020-10-20  8:30     ` Philipp Zabel
2020-10-23 13:45       ` Sameer Pujar
2020-10-16 14:42 ` [PATCH v4 09/15] ASoC: dt-bindings: audio-graph: Convert " Sameer Pujar
2020-10-19  2:50   ` Kuninori Morimoto
2020-10-19  4:30     ` Sameer Pujar
2020-10-19  4:41       ` Kuninori Morimoto
2020-10-19 22:11         ` Rob Herring
2020-10-16 14:42 ` [PATCH v4 10/15] ASoC: dt-bindings: tegra: Add graph bindings Sameer Pujar
2020-10-19 22:11   ` Rob Herring
2020-10-20  6:03     ` Sameer Pujar
2020-10-16 14:42 ` [PATCH v4 11/15] ASoC: dt-bindings: tegra: Add json-schema for Tegra audio graph card Sameer Pujar
2020-10-19 22:16   ` Rob Herring
2020-10-20  6:16     ` Sameer Pujar
2020-10-20 13:24       ` Rob Herring
2020-10-16 14:42 ` [PATCH v4 12/15] ASoC: tegra: Add audio graph based card driver Sameer Pujar
2020-10-16 14:43 ` [PATCH v4 13/15] arm64: defconfig: Enable Tegra audio graph " Sameer Pujar
2020-10-16 14:43 ` [PATCH v4 14/15] arm64: tegra: Audio graph header for Tegra210 Sameer Pujar
2020-10-16 14:43 ` [PATCH v4 15/15] arm64: tegra: Audio graph sound card for Jetson Nano and TX1 Sameer Pujar
2020-10-30  6:34 ` [PATCH v4 00/15] Audio graph card updates and usage with Tegra210 audio Sameer Pujar
2020-10-30 13:58   ` Mark Brown

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