Re: [PATCH] dt-bindings: soc: qcom,smp2p: convert to dtschema

[Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>]

On 01/04/2022 19:10, Krzysztof Kozlowski wrote:
> Convert the Qualcomm Shared Memory Point 2 Point bindings to DT Schema.
> 
> Changes against original bindings: enforce only specific names of child
> nodes, instead of any names.
> 
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> ---
>  .../bindings/soc/qcom/qcom,smp2p.txt          | 110 -------------
>  .../bindings/soc/qcom/qcom,smp2p.yaml         | 145 ++++++++++++++++++
>  2 files changed, 145 insertions(+), 110 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,smp2p.txt
>  create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,smp2p.yaml
> 
> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,smp2p.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,smp2p.txt
> deleted file mode 100644
> index 49e1d72d3648..000000000000
> --- a/Documentation/devicetree/bindings/soc/qcom/qcom,smp2p.txt
> +++ /dev/null
> @@ -1,110 +0,0 @@
> -Qualcomm Shared Memory Point 2 Point binding
> -
> -The Shared Memory Point to Point (SMP2P) protocol facilitates communication of
> -a single 32-bit value between two processors.  Each value has a single writer
> -(the local side) and a single reader (the remote side).  Values are uniquely
> -identified in the system by the directed edge (local processor ID to remote
> -processor ID) and a string identifier.
> -
> -- compatible:
> -	Usage: required
> -	Value type: <string>
> -	Definition: must be one of:
> -		    "qcom,smp2p"
> -
> -- interrupts:
> -	Usage: required
> -	Value type: <prop-encoded-array>
> -	Definition: one entry specifying the smp2p notification interrupt
> -
> -- mboxes:
> -	Usage: required
> -	Value type: <prop-encoded-array>
> -	Definition: reference to the associated doorbell in APCS, as described
> -		    in mailbox/mailbox.txt
> -
> -- qcom,ipc:
> -	Usage: required, unless mboxes is specified
> -	Value type: <prop-encoded-array>
> -	Definition: three entries specifying the outgoing ipc bit used for
> -		    signaling the remote end of the smp2p edge:
> -		    - phandle to a syscon node representing the apcs registers
> -		    - u32 representing offset to the register within the syscon
> -		    - u32 representing the ipc bit within the register
> -
> -- qcom,smem:
> -	Usage: required
> -	Value type: <u32 array>
> -	Definition: two identifiers of the inbound and outbound smem items used
> -		    for this edge
> -
> -- qcom,local-pid:
> -	Usage: required
> -	Value type: <u32>
> -	Definition: specifies the identifier of the local endpoint of this edge
> -
> -- qcom,remote-pid:
> -	Usage: required
> -	Value type: <u32>
> -	Definition: specifies the identifier of the remote endpoint of this edge
> -
> -= SUBNODES
> -Each SMP2P pair contain a set of inbound and outbound entries, these are
> -described in subnodes of the smp2p device node. The node names are not
> -important.
> -
> -- qcom,entry-name:
> -	Usage: required
> -	Value type: <string>
> -	Definition: specifies the name of this entry, for inbound entries this
> -		    will be used to match against the remotely allocated entry
> -		    and for outbound entries this name is used for allocating
> -		    entries
> -
> -- interrupt-controller:
> -	Usage: required for incoming entries
> -	Value type: <empty>
> -	Definition: marks the entry as inbound; the node should be specified
> -		    as a two cell interrupt-controller as defined in
> -		    "../interrupt-controller/interrupts.txt"
> -		    If not specified this node will denote the outgoing entry
> -
> -- #interrupt-cells:
> -	Usage: required for incoming entries
> -	Value type: <u32>
> -	Definition: must be 2 - denoting the bit in the entry and IRQ flags
> -
> -- #qcom,smem-state-cells:
> -	Usage: required for outgoing entries
> -	Value type: <u32>
> -	Definition: must be 1 - denoting the bit in the entry
> -
> -= EXAMPLE
> -The following example shows the SMP2P setup with the wireless processor,
> -defined from the 8974 apps processor's point-of-view. It encompasses one
> -inbound and one outbound entry:
> -
> -wcnss-smp2p {
> -	compatible = "qcom,smp2p";
> -	qcom,smem = <431>, <451>;
> -
> -	interrupts = <0 143 1>;
> -
> -	qcom,ipc = <&apcs 8 18>;
> -
> -	qcom,local-pid = <0>;
> -	qcom,remote-pid = <4>;
> -
> -	wcnss_smp2p_out: master-kernel {
> -		qcom,entry-name = "master-kernel";
> -
> -		#qcom,smem-state-cells = <1>;
> -	};
> -
> -	wcnss_smp2p_in: slave-kernel {
> -		qcom,entry-name = "slave-kernel";
> -
> -		interrupt-controller;
> -		#interrupt-cells = <2>;
> -	};
> -};
> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,smp2p.yaml b/Documentation/devicetree/bindings/soc/qcom/qcom,smp2p.yaml
> new file mode 100644
> index 000000000000..8c362ce3c05b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,smp2p.yaml
> @@ -0,0 +1,145 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/qcom/qcom,smp2p.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Shared Memory Point 2 Point
> +
> +maintainers:
> +  - Andy Gross <agross@kernel.org>
> +  - Bjorn Andersson <bjorn.andersson@linaro.org>
> +  - Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> +
> +description:
> +  The Shared Memory Point to Point (SMP2P) protocol facilitates communication
> +  of a single 32-bit value between two processors.  Each value has a single
> +  writer (the local side) and a single reader (the remote side).  Values are
> +  uniquely identified in the system by the directed edge (local processor ID to
> +  remote processor ID) and a string identifier.
> +
> +properties:
> +  compatible:
> +    const: qcom,smp2p
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  mboxes:
> +    maxItems: 1
> +    description:
> +      Reference to the mailbox representing the outgoing doorbell in APCS for
> +      this client.
> +
> +  qcom,ipc:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    items:
> +      - items:
> +          - description: phandle to a syscon node representing the apcs registers
> +          - description: u32 representing offset to the register within the syscon
> +          - description: u32 representing the ipc bit within the register
> +    description:
> +      Three entries specifying the outgoing ipc bit used for signaling the
> +      remote end of the smp2p edge.
> +
> +  qcom,local-pid:
> +    $ref: /schemas/types.yaml#/definitions/uint32-array

While converting the next schema (SMD) I found here a mistake. This is
not an array, but one number.

I'll send a v2.


Best regards,
Krzysztof