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Date:   Mon, 6 Jun 2022 14:33:03 -0500
From:   Rob Herring <robh@kernel.org>
To:     Conor Dooley <mail@conchuod.ie>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Andrew Lunn <andrew@lunn.ch>,
        Support Opensource <support.opensource@diasemi.com>,
        Lee Jones <lee.jones@linaro.org>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Steve Twiss <stwiss.opensource@diasemi.com>,
        Conor Dooley <conor.dooley@microchip.com>,
        linux-i2c@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org,
        linux-riscv@lists.infradead.org,
        Atul Khare <atulkhare@rivosinc.com>
Subject: Re: [PATCH v2 2/4] dt-bindings: i2c: convert ocores binding to yaml
Message-ID: <20220606193303.GA1124108-robh@kernel.org>
References: <20220606152557.438771-1-mail@conchuod.ie>
 <20220606152557.438771-3-mail@conchuod.ie>
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On Mon, Jun 06, 2022 at 04:25:56PM +0100, Conor Dooley wrote:
> From: Conor Dooley <conor.dooley@microchip.com>
> 
> Convert the open cores i2c controller binding from text to yaml.
> 
> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
> ---
>  .../devicetree/bindings/i2c/i2c-ocores.txt    |  78 -----------
>  .../bindings/i2c/opencores,i2c-ocores.yaml    | 123 ++++++++++++++++++
>  MAINTAINERS                                   |   2 +-
>  3 files changed, 124 insertions(+), 79 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/i2c/i2c-ocores.txt
>  create mode 100644 Documentation/devicetree/bindings/i2c/opencores,i2c-ocores.yaml
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-ocores.txt b/Documentation/devicetree/bindings/i2c/i2c-ocores.txt
> deleted file mode 100644
> index a37c9455b244..000000000000
> --- a/Documentation/devicetree/bindings/i2c/i2c-ocores.txt
> +++ /dev/null
> @@ -1,78 +0,0 @@
> -Device tree configuration for i2c-ocores
> -
> -Required properties:
> -- compatible      : "opencores,i2c-ocores"
> -                    "aeroflexgaisler,i2cmst"
> -                    "sifive,fu540-c000-i2c", "sifive,i2c0"
> -                    For Opencore based I2C IP block reimplemented in
> -                    FU540-C000 SoC.
> -                    "sifive,fu740-c000-i2c", "sifive,i2c0"
> -                    For Opencore based I2C IP block reimplemented in
> -                    FU740-C000 SoC.
> -                    Please refer to sifive-blocks-ip-versioning.txt for
> -                    additional details.
> -- reg             : bus address start and address range size of device
> -- clocks          : handle to the controller clock; see the note below.
> -                    Mutually exclusive with opencores,ip-clock-frequency
> -- opencores,ip-clock-frequency: frequency of the controller clock in Hz;
> -                    see the note below. Mutually exclusive with clocks
> -- #address-cells  : should be <1>
> -- #size-cells     : should be <0>
> -
> -Optional properties:
> -- interrupts      : interrupt number.
> -- clock-frequency : frequency of bus clock in Hz; see the note below.
> -                    Defaults to 100 KHz when the property is not specified
> -- reg-shift       : device register offsets are shifted by this value
> -- reg-io-width    : io register width in bytes (1, 2 or 4)
> -- regstep         : deprecated, use reg-shift above
> -
> -Note
> -clock-frequency property is meant to control the bus frequency for i2c bus
> -drivers, but it was incorrectly used to specify i2c controller input clock
> -frequency. So the following rules are set to fix this situation:
> -- if clock-frequency is present and neither opencores,ip-clock-frequency nor
> -  clocks are, then clock-frequency specifies i2c controller clock frequency.
> -  This is to keep backwards compatibility with setups using old DTB. i2c bus
> -  frequency is fixed at 100 KHz.
> -- if clocks is present it specifies i2c controller clock. clock-frequency
> -  property specifies i2c bus frequency.
> -- if opencores,ip-clock-frequency is present it specifies i2c controller
> -  clock frequency. clock-frequency property specifies i2c bus frequency.
> -
> -Examples:
> -
> -	i2c0: ocores@a0000000 {
> -		#address-cells = <1>;
> -		#size-cells = <0>;
> -		compatible = "opencores,i2c-ocores";
> -		reg = <0xa0000000 0x8>;
> -		interrupts = <10>;
> -		opencores,ip-clock-frequency = <20000000>;
> -
> -		reg-shift = <0>;	/* 8 bit registers */
> -		reg-io-width = <1>;	/* 8 bit read/write */
> -
> -		dummy@60 {
> -			compatible = "dummy";
> -			reg = <0x60>;
> -		};
> -	};
> -or
> -	i2c0: ocores@a0000000 {
> -		#address-cells = <1>;
> -		#size-cells = <0>;
> -		compatible = "opencores,i2c-ocores";
> -		reg = <0xa0000000 0x8>;
> -		interrupts = <10>;
> -		clocks = <&osc>;
> -		clock-frequency = <400000>; /* i2c bus frequency 400 KHz */
> -
> -		reg-shift = <0>;	/* 8 bit registers */
> -		reg-io-width = <1>;	/* 8 bit read/write */
> -
> -		dummy@60 {
> -			compatible = "dummy";
> -			reg = <0x60>;
> -		};
> -	};
> diff --git a/Documentation/devicetree/bindings/i2c/opencores,i2c-ocores.yaml b/Documentation/devicetree/bindings/i2c/opencores,i2c-ocores.yaml
> new file mode 100644
> index 000000000000..7074f019d94f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/opencores,i2c-ocores.yaml
> @@ -0,0 +1,123 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/i2c/opencores,i2c-ocores.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: OpenCores I2C controller
> +
> +maintainers:
> +  - Peter Korsgaard <peter@korsgaard.com>
> +  - Andrew Lunn <andrew@lunn.ch>
> +
> +allOf:
> +  - $ref: /schemas/i2c/i2c-controller.yaml#
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - items:
> +          - enum:
> +              - sifive,fu740-c000-i2c # Opencore based IP block FU740-C000 SoC
> +              - sifive,fu540-c000-i2c # Opencore based IP block FU540-C000 SoC
> +          - const: sifive,i2c0
> +      - enum:
> +          - opencores,i2c-ocores
> +          - aeroflexgaisler,i2cmst
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +

> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0

These 2 are covered by i2c-controller.yaml. Drop.

With that,

Reviewed-by: Rob Herring <robh@kernel.org>