Re: [PATCH v3 2/2] dt-bindings: nand: meson: refine Amlogic NAND controller driver

[Neil Armstrong <narmstrong@baylibre.com>]

Hi,

On 18/03/2022 13:41, Liang Yang wrote:
> convert txt to yaml and refine the meson NFC clock document.
> 
> Signed-off-by: Liang Yang <liang.yang@amlogic.com>
> ---
>   .../bindings/mtd/amlogic,meson-nand.txt       | 60 ----------------
>   .../bindings/mtd/amlogic,meson-nand.yaml      | 71 +++++++++++++++++++
>   2 files changed, 71 insertions(+), 60 deletions(-)
>   delete mode 100644 Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt
>   create mode 100644 Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt
> deleted file mode 100644
> index 5794ab1147c1..000000000000
> --- a/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.txt
> +++ /dev/null
> @@ -1,60 +0,0 @@
> -Amlogic NAND Flash Controller (NFC) for GXBB/GXL/AXG family SoCs
> -
> -This file documents the properties in addition to those available in
> -the MTD NAND bindings.
> -
> -Required properties:
> -- compatible : contains one of:
> -  - "amlogic,meson-gxl-nfc"
> -  - "amlogic,meson-axg-nfc"
> -- clocks     :
> -	A list of phandle + clock-specifier pairs for the clocks listed
> -	in clock-names.
> -
> -- clock-names: Should contain the following:
> -	"core" - NFC module gate clock
> -	"device" - device clock from eMMC sub clock controller
> -	"rx" - rx clock phase
> -	"tx" - tx clock phase
> -
> -- amlogic,mmc-syscon	: Required for NAND clocks, it's shared with SD/eMMC
> -				controller port C
> -
> -Optional children nodes:
> -Children nodes represent the available nand chips.
> -
> -Other properties:
> -see Documentation/devicetree/bindings/mtd/nand-controller.yaml for generic bindings.
> -
> -Example demonstrate on AXG SoC:
> -
> -	sd_emmc_c_clkc: mmc@7000 {
> -		compatible = "amlogic,meson-axg-mmc-clkc", "syscon";
> -		reg = <0x0 0x7000 0x0 0x800>;
> -	};
> -
> -	nand-controller@7800 {
> -		compatible = "amlogic,meson-axg-nfc";
> -		reg = <0x0 0x7800 0x0 0x100>;
> -		#address-cells = <1>;
> -		#size-cells = <0>;
> -		interrupts = <GIC_SPI 34 IRQ_TYPE_EDGE_RISING>;
> -
> -		clocks = <&clkc CLKID_SD_EMMC_C>,
> -			<&sd_emmc_c_clkc CLKID_MMC_DIV>,
> -			<&sd_emmc_c_clkc CLKID_MMC_PHASE_RX>,
> -			<&sd_emmc_c_clkc CLKID_MMC_PHASE_TX>;
> -		clock-names = "core", "device", "rx", "tx";
> -		amlogic,mmc-syscon = <&sd_emmc_c_clkc>;
> -
> -		pinctrl-names = "default";
> -		pinctrl-0 = <&nand_pins>;
> -
> -		nand@0 {
> -			reg = <0>;
> -			#address-cells = <1>;
> -			#size-cells = <1>;
> -
> -			nand-on-flash-bbt;
> -		};
> -	};
> diff --git a/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml
> new file mode 100644
> index 000000000000..4de4962a40b7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml
> @@ -0,0 +1,71 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/clock/amlogic,mmc-clkc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Amlogic NAND Flash Controller (NFC) for GXBB/GXL/AXG family SoCs
> +
> +maintainers:
> +  - liang.yang@amlogic.com
> +
> +properties:
> +  compatible:
> +    enum:
> +      - "amlogic,meson-gxl-nfc"
> +      - "amlogic,meson-axg-nfc"
> +
> +  reg:
> +    maxItems: 2

   reg-names:
     items:
       - const: nfc
       - const: mmc

Is missing to conform to the example

> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 2
> +
> +  clock-names:
> +    items:
> +      - const: "core", "device"

This should be:
   clock-names:
     items:
       - const: core
       - const: device

> +
> +  "#clock-cells":
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg

+ reg-names

> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - "#clock-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    nand-controller@7800 {
> +	compatible = "amlogic,meson-axg-nfc";
> +	reg = <0x0 0x7800 0x0 0x100>,
> +	      <0x0 0x7000 0x0 0x800>;
> +        reg-names = "nfc", "emmc";
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +	interrupts = <GIC_SPI 34 IRQ_TYPE_EDGE_RISING>;
> +
> +	clocks = <&clkc CLKID_SD_EMMC_C>,
> +		<&clkc CLKID_FCLK_DIV2>;
> +	clock-names = "core", "device";
> +
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&nand_pins>;
> +
> +	nand@0 {
> +		reg = <0>;
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +
> +		nand-on-flash-bbt;
> +	};
> +     };
> +
> +...

Don't forgot to run :
make ARCH=-arm64 dt_binding_check DT_SCHEMA_FILES=Documentation/devicetree/bindings/mtd/amlogic,meson-nand.yaml

after installing the DT schema validator:
pip3 install git+https://github.com/devicetree-org/dt-schema.git@master

as documented at https://www.kernel.org/doc/html/v5.9/devicetree/writing-schema.html

Thanks !
Neil

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