Re: [PATCH] dt-bindings: can: xilinx_can: Convert Xilinx CAN binding to YAML

[Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>]

On 08/02/2022 16:52, Amit Kumar Mahapatra wrote:
> Convert Xilinx CAN binding documentation to YAML.
> 
> Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
> ---
> BRANCH: yaml
> ---
>  .../bindings/net/can/xilinx_can.txt           |  61 --------
>  .../bindings/net/can/xilinx_can.yaml          | 146 ++++++++++++++++++
>  2 files changed, 146 insertions(+), 61 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/net/can/xilinx_can.txt
>  create mode 100644 Documentation/devicetree/bindings/net/can/xilinx_can.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/can/xilinx_can.txt b/Documentation/devicetree/bindings/net/can/xilinx_can.txt
> deleted file mode 100644
> index 100cc40b8510..000000000000
> --- a/Documentation/devicetree/bindings/net/can/xilinx_can.txt
> +++ /dev/null
> @@ -1,61 +0,0 @@
> -Xilinx Axi CAN/Zynq CANPS controller Device Tree Bindings
> ----------------------------------------------------------
> -
> -Required properties:
> -- compatible		: Should be:
> -			  - "xlnx,zynq-can-1.0" for Zynq CAN controllers
> -			  - "xlnx,axi-can-1.00.a" for Axi CAN controllers
> -			  - "xlnx,canfd-1.0" for CAN FD controllers
> -			  - "xlnx,canfd-2.0" for CAN FD 2.0 controllers
> -- reg			: Physical base address and size of the controller
> -			  registers map.
> -- interrupts		: Property with a value describing the interrupt
> -			  number.
> -- clock-names		: List of input clock names
> -			  - "can_clk", "pclk" (For CANPS),
> -			  - "can_clk", "s_axi_aclk" (For AXI CAN and CAN FD).
> -			  (See clock bindings for details).
> -- clocks		: Clock phandles (see clock bindings for details).
> -- tx-fifo-depth		: Can Tx fifo depth (Zynq, Axi CAN).
> -- rx-fifo-depth		: Can Rx fifo depth (Zynq, Axi CAN, CAN FD in
> -                          sequential Rx mode).
> -- tx-mailbox-count	: Can Tx mailbox buffer count (CAN FD).
> -- rx-mailbox-count	: Can Rx mailbox buffer count (CAN FD in mailbox Rx
> -			  mode).
> -
> -
> -Example:
> -
> -For Zynq CANPS Dts file:
> -	zynq_can_0: can@e0008000 {
> -			compatible = "xlnx,zynq-can-1.0";
> -			clocks = <&clkc 19>, <&clkc 36>;
> -			clock-names = "can_clk", "pclk";
> -			reg = <0xe0008000 0x1000>;
> -			interrupts = <0 28 4>;
> -			interrupt-parent = <&intc>;
> -			tx-fifo-depth = <0x40>;
> -			rx-fifo-depth = <0x40>;
> -		};
> -For Axi CAN Dts file:
> -	axi_can_0: axi-can@40000000 {
> -			compatible = "xlnx,axi-can-1.00.a";
> -			clocks = <&clkc 0>, <&clkc 1>;
> -			clock-names = "can_clk","s_axi_aclk" ;
> -			reg = <0x40000000 0x10000>;
> -			interrupt-parent = <&intc>;
> -			interrupts = <0 59 1>;
> -			tx-fifo-depth = <0x40>;
> -			rx-fifo-depth = <0x40>;
> -		};
> -For CAN FD Dts file:
> -	canfd_0: canfd@40000000 {
> -			compatible = "xlnx,canfd-1.0";
> -			clocks = <&clkc 0>, <&clkc 1>;
> -			clock-names = "can_clk", "s_axi_aclk";
> -			reg = <0x40000000 0x2000>;
> -			interrupt-parent = <&intc>;
> -			interrupts = <0 59 1>;
> -			tx-mailbox-count = <0x20>;
> -			rx-fifo-depth = <0x20>;
> -		};
> diff --git a/Documentation/devicetree/bindings/net/can/xilinx_can.yaml b/Documentation/devicetree/bindings/net/can/xilinx_can.yaml
> new file mode 100644
> index 000000000000..cdf2e4a20662
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/can/xilinx_can.yaml
> @@ -0,0 +1,146 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/can/xilinx_can.yaml#

Filename: xilinx,can.yaml to match common format.

> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title:
> +  Xilinx Axi CAN/Zynq CANPS controller Binding
> +
> +maintainers:
> +  - Appana Durga Kedareswara rao <appana.durga.rao@xilinx.com>
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - const: xlnx,zynq-can-1.0
> +        description: For Zynq CAN controller
> +      - const: xlnx,axi-can-1.00.a
> +        description: For Axi CAN controller
> +      - const: xlnx,canfd-1.0
> +        description: For CAN FD controller
> +      - const: xlnx,canfd-2.0
> +        description: For CAN FD 2.0 controller

This should be enum, not oneOf. Any reason for using oneOf?

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    description: |
> +      CAN functional clock phandle
> +    maxItems: 2

1. minItems
2. You miss clock-names.

> +
> +  tx-fifo-depth:
> +    description: |
> +      CAN Tx fifo depth (Zynq, Axi CAN).

Non-standard fields need type. Here and in all other places.

> +
> +  rx-fifo-depth:
> +    description: |
> +      CAN Rx fifo depth (Zynq, Axi CAN, CAN FD in sequential Rx mode)
> +
> +  tx-mailbox-count:
> +    description: |
> +      CAN Tx mailbox buffer count (CAN FD)
> +
> +  rx-mailbox-count:
> +    description: |
> +      CAN Rx mailbox buffer count (CAN FD in mailbox Rx  mode)
> +
> +  clock-names:
> +    maxItems: 2

Oh... here are the clock-names.... why sorted randomly?

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - clock-names
> +
> +additionalProperties: false
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: xlnx,zynq-can-1.0
> +
> +    then:
> +      properties:
> +        clock-names:
> +          items:
> +            - const: can_clk
> +            - const: pclk
> +      required:
> +        - tx-fifo-depth
> +        - rx-fifo-depth
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: xlnx,axi-can-1.00.a
> +
> +    then:
> +      properties:
> +        clock-names:
> +          items:
> +            - const: can_clk
> +            - const: s_axi_aclk
> +      required:
> +        - tx-fifo-depth
> +        - rx-fifo-depth
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: xlnx,canfd-1.0
> +
> +    then:
> +      properties:
> +        clock-names:
> +          items:
> +            - const: can_clk
> +            - const: s_axi_aclk
> +      required:
> +        - tx-mailbox-count
> +        - rx-fifo-depth
> +
> +examples:
> +  - |
> +    can@e0008000 {
> +        compatible = "xlnx,zynq-can-1.0";
> +        clocks = <&clkc 19>, <&clkc 36>;
> +        clock-names = "can_clk", "pclk";
> +        reg = <0xe0008000 0x1000>;
> +        interrupts = <0 28 4>;

Isn't it a regular GIC interrupt? If yes, use defines instead of
hard-coded values.

> +        interrupt-parent = <&intc>;
> +        tx-fifo-depth = <0x40>;
> +        rx-fifo-depth = <0x40>;
> +    };

Blank line.

> +  - |
> +    axi-can@40000000 {

Generic node name, so "can".

> +        compatible = "xlnx,axi-can-1.00.a";
> +        clocks = <&clkc 0>, <&clkc 1>;
> +        clock-names = "can_clk","s_axi_aclk" ;
> +        reg = <0x40000000 0x10000>;
> +        interrupt-parent = <&intc>;
> +        interrupts = <0 59 1>;
> +        tx-fifo-depth = <0x40>;
> +        rx-fifo-depth = <0x40>;
> +    };

Blank line.

> +  - |
> +    canfd@40000000 {

Generic node name, so "can".

> +        compatible = "xlnx,canfd-1.0";
> +        clocks = <&clkc 0>, <&clkc 1>;
> +        clock-names = "can_clk", "s_axi_aclk";
> +        reg = <0x40000000 0x2000>;
> +        interrupt-parent = <&intc>;
> +        interrupts = <0 59 1>;
> +        tx-mailbox-count = <0x20>;
> +        rx-fifo-depth = <0x20>;
> +    };


Best regards,
Krzysztof