Re: [PATCH 16/19] dt-bindings: ipmi: Convert ASPEED KCS binding to schema

[Rob Herring]

On Sat, Feb 20, 2021 at 12:55:20AM +1030, Andrew Jeffery wrote:
> Given the deprecated binding, improve the ability to detect issues in
> the platform devicetrees. Further, a subsequent patch will introduce a
> new interrupts property for specifying SerIRQ behaviour, so convert
> before we do any further additions.
> 
> Signed-off-by: Andrew Jeffery <andrew@xxxxxxxx>
> ---
>  .../bindings/ipmi/aspeed,ast2400-kcs-bmc.yaml | 92 +++++++++++++++++++
>  .../bindings/ipmi/aspeed-kcs-bmc.txt          | 33 -------
>  2 files changed, 92 insertions(+), 33 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/ipmi/aspeed,ast2400-kcs-bmc.yaml
>  delete mode 100644 Documentation/devicetree/bindings/ipmi/aspeed-kcs-bmc.txt
> 
> diff --git a/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-kcs-bmc.yaml b/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-kcs-bmc.yaml
> new file mode 100644
> index 000000000000..1c1cc4265948
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/ipmi/aspeed,ast2400-kcs-bmc.yaml
> @@ -0,0 +1,92 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/ipmi/aspeed,ast2400-kcs-bmc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ASPEED BMC KCS Devices
> +
> +maintainers:
> +  - Andrew Jeffery <andrew@xxxxxxxx>
> +
> +description: |
> +  The Aspeed BMC SoCs typically use the Keyboard-Controller-Style (KCS)
> +  interfaces on the LPC bus for in-band IPMI communication with their host.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - description: Channel ID derived from reg
> +        items:
> +          enum:
> +            - aspeed,ast2400-kcs-bmc-v2
> +            - aspeed,ast2500-kcs-bmc-v2
> +            - aspeed,ast2600-kcs-bmc
> +
> +      - description: Old-style with explicit channel ID, no reg
> +        deprecated: true
> +        items:
> +          enum:
> +            - aspeed,ast2400-kcs-bmc
> +            - aspeed,ast2500-kcs-bmc
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  reg:
> +    minItems: 3
> +    maxItems: 3
> +    description: IDR, ODR and STR register addresses

items:
  - description: IDR register
  - description: ODR register
  - description: STR register

> +
> +  aspeed,lpc-io-reg:
> +    $ref: '/schemas/types.yaml#/definitions/uint32'
> +    minItems: 1
> +    maxItems: 2

A uint32 can only have 1 item. uint32-array perhaps?


> +    description: |
> +      The host CPU LPC IO data and status addresses for the device. For most
> +      channels the status address is derived from the data address, but the
> +      status address may be optionally provided.
> +
> +  kcs_chan:
> +    deprecated: true
> +    $ref: '/schemas/types.yaml#/definitions/uint32'
> +    maxItems: 1

Drop

> +    description: The LPC channel number in the controller
> +
> +  kcs_addr:
> +    deprecated: true
> +    $ref: '/schemas/types.yaml#/definitions/uint32'
> +    maxItems: 1

Drop

> +    description: The host CPU IO map address
> +
> +required:
> +  - compatible
> +  - interrupts
> +
> +additionalProperties: false
> +
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - aspeed,ast2400-kcs-bmc
> +              - aspeed,ast2500-kcs-bmc
> +    then:
> +      required:
> +        - kcs_chan
> +        - kcs_addr
> +    else:
> +      required:
> +        - reg
> +        - aspeed,lpc-io-reg
> +
> +examples:
> +  - |
> +    kcs3: kcs@24 {
> +        compatible = "aspeed,ast2600-kcs-bmc";
> +        reg = <0x24 0x1>, <0x30 0x1>, <0x3c 0x1>;
> +        aspeed,lpc-io-reg = <0xca2>;
> +        interrupts = <8>;
> +    };
> diff --git a/Documentation/devicetree/bindings/ipmi/aspeed-kcs-bmc.txt b/Documentation/devicetree/bindings/ipmi/aspeed-kcs-bmc.txt
> deleted file mode 100644
> index 193e71ca96b0..000000000000
> --- a/Documentation/devicetree/bindings/ipmi/aspeed-kcs-bmc.txt
> +++ /dev/null
> @@ -1,33 +0,0 @@
> -# Aspeed KCS (Keyboard Controller Style) IPMI interface
> -
> -The Aspeed SOCs (AST2400 and AST2500) are commonly used as BMCs
> -(Baseboard Management Controllers) and the KCS interface can be
> -used to perform in-band IPMI communication with their host.
> -
> -## v1
> -Required properties:
> -- compatible : should be one of
> -    "aspeed,ast2400-kcs-bmc"
> -    "aspeed,ast2500-kcs-bmc"
> -- interrupts : interrupt generated by the controller
> -- kcs_chan : The LPC channel number in the controller
> -- kcs_addr : The host CPU IO map address
> -
> -## v2
> -Required properties:
> -- compatible : should be one of
> -    "aspeed,ast2400-kcs-bmc-v2"
> -    "aspeed,ast2500-kcs-bmc-v2"
> -- reg : The address and size of the IDR, ODR and STR registers
> -- interrupts : interrupt generated by the controller
> -- aspeed,lpc-io-reg : The host CPU LPC IO address for the device
> -
> -Example:
> -
> -    kcs3: kcs@24 {
> -        compatible = "aspeed,ast2500-kcs-bmc-v2";
> -        reg = <0x24 0x1>, <0x30 0x1>, <0x3c 0x1>;
> -        aspeed,lpc-reg = <0xca2>;
> -        interrupts = <8>;
> -        status = "okay";
> -    };
> -- 
> 2.27.0
>