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Date: Mon, 15 Jun 2020 10:24:45 -0600
From: Rob Herring <robh@...nel.org>
To: Anson Huang <Anson.Huang@....com>
Cc: ulf.hansson@...aro.org, shawnguo@...nel.org,
s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
mpa@...gutronix.de, linux-mmc@...r.kernel.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, Linux-imx@....com
Subject: Re: [PATCH V2 1/3] dt-bindings: mmc: Convert imx esdhc to json-schema
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@....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@...04000 {
> - compatible = "fsl,imx51-esdhc";
> - reg = <0x70004000 0x4000>;
> - interrupts = <1>;
> - fsl,wp-controller;
> -};
> -
> -esdhc@...08000 {
> - 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@...aro.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@...04000 {
> + compatible = "fsl,imx51-esdhc";
> + reg = <0x70004000 0x4000>;
> + interrupts = <1>;
> + fsl,wp-controller;
> + };
> +
> + mmc@...08000 {
> + 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
>
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