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Date:   Mon, 15 Jun 2020 10:24:45 -0600
From:   Rob Herring <robh@kernel.org>
To:     Anson Huang <Anson.Huang@nxp.com>
Cc:     ulf.hansson@linaro.org, shawnguo@kernel.org,
        s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com,
        mpa@pengutronix.de, linux-mmc@vger.kernel.org,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, Linux-imx@nxp.com
Subject: Re: [PATCH V2 1/3] dt-bindings: mmc: Convert imx esdhc to json-schema
Message-ID: <20200615162445.GA1885779@bogus>
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 <1591234886-15351-2-git-send-email-Anson.Huang@nxp.com>
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On Thu, Jun 04, 2020 at 09:41:24AM +0800, Anson Huang wrote:
> Convert the i.MX ESDHC binding to DT schema format using json-schema
> 
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> ---
> Changes since V1:
> 	- add "unevaluatedProperties: false".
> ---
>  .../devicetree/bindings/mmc/fsl-imx-esdhc.txt      |  67 -----------
>  .../devicetree/bindings/mmc/fsl-imx-esdhc.yaml     | 124 +++++++++++++++++++++
>  2 files changed, 124 insertions(+), 67 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
>  create mode 100644 Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
> deleted file mode 100644
> index de1b8bd..0000000
> --- a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
> +++ /dev/null
> @@ -1,67 +0,0 @@
> -* Freescale Enhanced Secure Digital Host Controller (eSDHC) for i.MX
> -
> -The Enhanced Secure Digital Host Controller on Freescale i.MX family
> -provides an interface for MMC, SD, and SDIO types of memory cards.
> -
> -This file documents differences between the core properties described
> -by mmc.txt and the properties used by the sdhci-esdhc-imx driver.
> -
> -Required properties:
> -- compatible : Should be "fsl,<chip>-esdhc", the supported chips include
> -	       "fsl,imx25-esdhc"
> -	       "fsl,imx35-esdhc"
> -	       "fsl,imx51-esdhc"
> -	       "fsl,imx53-esdhc"
> -	       "fsl,imx6q-usdhc"
> -	       "fsl,imx6sl-usdhc"
> -	       "fsl,imx6sx-usdhc"
> -	       "fsl,imx6ull-usdhc"
> -	       "fsl,imx7d-usdhc"
> -	       "fsl,imx7ulp-usdhc"
> -	       "fsl,imx8mq-usdhc"
> -	       "fsl,imx8mm-usdhc"
> -	       "fsl,imx8mn-usdhc"
> -	       "fsl,imx8mp-usdhc"
> -	       "fsl,imx8qm-usdhc"
> -	       "fsl,imx8qxp-usdhc"
> -
> -Optional properties:
> -- fsl,wp-controller : Indicate to use controller internal write protection
> -- fsl,delay-line : Specify the number of delay cells for override mode.
> -  This is used to set the clock delay for DLL(Delay Line) on override mode
> -  to select a proper data sampling window in case the clock quality is not good
> -  due to signal path is too long on the board. Please refer to eSDHC/uSDHC
> -  chapter, DLL (Delay Line) section in RM for details.
> -- voltage-ranges : Specify the voltage range in case there are software
> -  transparent level shifters on the outputs of the controller. Two cells are
> -  required, first cell specifies minimum slot voltage (mV), second cell
> -  specifies maximum slot voltage (mV). Several ranges could be specified.
> -- fsl,tuning-start-tap: Specify the start dealy cell point when send first CMD19
> -  in tuning procedure.
> -- fsl,tuning-step: Specify the increasing delay cell steps in tuning procedure.
> -  The uSDHC use one delay cell as default increasing step to do tuning process.
> -  This property allows user to change the tuning step to more than one delay
> -  cells which is useful for some special boards or cards when the default
> -  tuning step can't find the proper delay window within limited tuning retries.
> -- fsl,strobe-dll-delay-target: Specify the strobe dll control slave delay target.
> -  This delay target programming host controller loopback read clock, and this
> -  property allows user to change the delay target for the strobe input read clock.
> -  If not use this property, driver default set the delay target to value 7.
> -  Only eMMC HS400 mode need to take care of this property.
> -
> -Examples:
> -
> -esdhc@70004000 {
> -	compatible = "fsl,imx51-esdhc";
> -	reg = <0x70004000 0x4000>;
> -	interrupts = <1>;
> -	fsl,wp-controller;
> -};
> -
> -esdhc@70008000 {
> -	compatible = "fsl,imx51-esdhc";
> -	reg = <0x70008000 0x4000>;
> -	interrupts = <2>;
> -	cd-gpios = <&gpio1 6 0>; /* GPIO1_6 */
> -	wp-gpios = <&gpio1 5 0>; /* GPIO1_5 */
> -};
> diff --git a/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
> new file mode 100644
> index 0000000..74db24aa
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.yaml
> @@ -0,0 +1,124 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mmc/fsl-imx-esdhc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale Enhanced Secure Digital Host Controller (eSDHC) for i.MX
> +
> +maintainers:
> +  - Shawn Guo <shawn.guo@linaro.org>
> +
> +allOf:
> +  - $ref: "mmc-controller.yaml"
> +
> +description: |
> +  The Enhanced Secure Digital Host Controller on Freescale i.MX family
> +  provides an interface for MMC, SD, and SDIO types of memory cards.
> +
> +  This file documents differences between the core properties described
> +  by mmc.txt and the properties used by the sdhci-esdhc-imx driver.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - fsl,imx25-esdhc
> +      - fsl,imx35-esdhc
> +      - fsl,imx51-esdhc
> +      - fsl,imx53-esdhc
> +      - fsl,imx6q-usdhc
> +      - fsl,imx6sl-usdhc
> +      - fsl,imx6sx-usdhc
> +      - fsl,imx6ull-usdhc
> +      - fsl,imx7d-usdhc
> +      - fsl,imx7ulp-usdhc
> +      - fsl,imx8mq-usdhc
> +      - fsl,imx8mm-usdhc
> +      - fsl,imx8mn-usdhc
> +      - fsl,imx8mp-usdhc
> +      - fsl,imx8qm-usdhc
> +      - fsl,imx8qxp-usdhc
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  fsl,wp-controller:
> +    description: |
> +      boolean, if present, indicate to use controller internal write protection.
> +    type: boolean
> +
> +  fsl,delay-line:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      Specify the number of delay cells for override mode.
> +      This is used to set the clock delay for DLL(Delay Line) on override mode
> +      to select a proper data sampling window in case the clock quality is not good
> +      due to signal path is too long on the board. Please refer to eSDHC/uSDHC
> +      chapter, DLL (Delay Line) section in RM for details.
> +    default: 0
> +
> +  voltage-ranges:
> +    $ref: '/schemas/types.yaml#/definitions/uint32-matrix'
> +    description: |
> +      Specify the voltage range in case there are software
> +      transparent level shifters on the outputs of the controller. Two cells are
> +      required, first cell specifies minimum slot voltage (mV), second cell
> +      specifies maximum slot voltage (mV). Several ranges could be specified.
> +    items:
> +      items:
> +        - description: value for minimum slot voltage
> +        - description: value for maximum slot voltage
> +    maxItems: 1

This contradicts 'Several ranges could be specified.'

> +
> +  fsl,tuning-start-tap:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      Specify the start dealy cell point when send first CMD19 in tuning procedure.

typo: delay

> +    default: 0
> +
> +  fsl,tuning-step:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      Specify the increasing delay cell steps in tuning procedure.
> +      The uSDHC use one delay cell as default increasing step to do tuning process.
> +      This property allows user to change the tuning step to more than one delay
> +      cells which is useful for some special boards or cards when the default
> +      tuning step can't find the proper delay window within limited tuning retries.
> +    default: 0
> +
> +  fsl,strobe-dll-delay-target:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: |
> +      Specify the strobe dll control slave delay target.
> +      This delay target programming host controller loopback read clock, and this
> +      property allows user to change the delay target for the strobe input read clock.
> +      If not use this property, driver default set the delay target to value 7.
> +      Only eMMC HS400 mode need to take care of this property.
> +    default: 0
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    mmc@70004000 {
> +        compatible = "fsl,imx51-esdhc";
> +        reg = <0x70004000 0x4000>;
> +        interrupts = <1>;
> +        fsl,wp-controller;
> +    };
> +
> +    mmc@70008000 {
> +        compatible = "fsl,imx51-esdhc";
> +        reg = <0x70008000 0x4000>;
> +        interrupts = <2>;
> +        cd-gpios = <&gpio1 6 0>; /* GPIO1_6 */
> +        wp-gpios = <&gpio1 5 0>; /* GPIO1_5 */
> +    };
> -- 
> 2.7.4
>