linux-kernel - Re: [PATCH 4/8] dt-bindings: memory: Convert ingenic,jz4780-nemc.txt to YAML

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Date:   Mon, 11 May 2020 17:54:36 -0500
From:   Rob Herring <robh@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     od@...c.me, 周琰杰 <zhouyanjie@...yeetech.com>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-i2c@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-gpio@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH 4/8] dt-bindings: memory: Convert ingenic,jz4780-nemc.txt
 to YAML

On Sun, Apr 26, 2020 at 08:58:52PM +0200, Paul Cercueil wrote:
> Convert the ingenic,jz4780-nemc.txt doc file to ingenic,nemc.yaml.
> 
> The ingenic,jz4725b-nemc compatible string was added in the process,
> with a fallback to ingenic,jz4740-nemc.
> 
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  .../ingenic,jz4780-nemc.txt                   | 76 ---------------
>  .../ingenic,nemc-client.yaml                  | 45 +++++++++
>  .../memory-controllers/ingenic,nemc.yaml      | 95 +++++++++++++++++++
>  3 files changed, 140 insertions(+), 76 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/memory-controllers/ingenic,jz4780-nemc.txt
>  create mode 100644 Documentation/devicetree/bindings/memory-controllers/ingenic,nemc-client.yaml
>  create mode 100644 Documentation/devicetree/bindings/memory-controllers/ingenic,nemc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/memory-controllers/ingenic,jz4780-nemc.txt b/Documentation/devicetree/bindings/memory-controllers/ingenic,jz4780-nemc.txt
> deleted file mode 100644
> index 59b8dcc118ee..000000000000
> --- a/Documentation/devicetree/bindings/memory-controllers/ingenic,jz4780-nemc.txt
> +++ /dev/null
> @@ -1,76 +0,0 @@
> -* Ingenic JZ4780 NAND/external memory controller (NEMC)
> -
> -This file documents the device tree bindings for the NEMC external memory
> -controller in Ingenic JZ4780
> -
> -Required properties:
> -- compatible: Should be set to one of:
> -    "ingenic,jz4740-nemc" (JZ4740)
> -    "ingenic,jz4780-nemc" (JZ4780)
> -- reg: Should specify the NEMC controller registers location and length.
> -- clocks: Clock for the NEMC controller.
> -- #address-cells: Must be set to 2.
> -- #size-cells: Must be set to 1.
> -- ranges: A set of ranges for each bank describing the physical memory layout.
> -  Each should specify the following 4 integer values:
> -
> -    <cs number> 0 <physical address of mapping> <size of mapping>
> -
> -Each child of the NEMC node describes a device connected to the NEMC.
> -
> -Required child node properties:
> -- reg: Should contain at least one register specifier, given in the following
> -  format:
> -
> -    <cs number> <offset> <size>
> -
> -  Multiple registers can be specified across multiple banks. This is needed,
> -  for example, for packaged NAND devices with multiple dies. Such devices
> -  should be grouped into a single node.
> -
> -Optional child node properties:
> -- ingenic,nemc-bus-width: Specifies the bus width in bits. Defaults to 8 bits.
> -- ingenic,nemc-tAS: Address setup time in nanoseconds.
> -- ingenic,nemc-tAH: Address hold time in nanoseconds.
> -- ingenic,nemc-tBP: Burst pitch time in nanoseconds.
> -- ingenic,nemc-tAW: Access wait time in nanoseconds.
> -- ingenic,nemc-tSTRV: Static memory recovery time in nanoseconds.
> -
> -If a child node references multiple banks in its "reg" property, the same value
> -for all optional parameters will be configured for all banks. If any optional
> -parameters are omitted, they will be left unchanged from whatever they are
> -configured to when the NEMC device is probed (which may be the reset value as
> -given in the hardware reference manual, or a value configured by the boot
> -loader).
> -
> -Example (NEMC node with a NAND child device attached at CS1):
> -
> -nemc: nemc@...10000 {
> -	compatible = "ingenic,jz4780-nemc";
> -	reg = <0x13410000 0x10000>;
> -
> -	#address-cells = <2>;
> -	#size-cells = <1>;
> -
> -	ranges = <1 0 0x1b000000 0x1000000
> -		  2 0 0x1a000000 0x1000000
> -		  3 0 0x19000000 0x1000000
> -		  4 0 0x18000000 0x1000000
> -		  5 0 0x17000000 0x1000000
> -		  6 0 0x16000000 0x1000000>;
> -
> -	clocks = <&cgu JZ4780_CLK_NEMC>;
> -
> -	nand: nand@1 {
> -		compatible = "ingenic,jz4780-nand";
> -		reg = <1 0 0x1000000>;
> -
> -		ingenic,nemc-tAS = <10>;
> -		ingenic,nemc-tAH = <5>;
> -		ingenic,nemc-tBP = <10>;
> -		ingenic,nemc-tAW = <15>;
> -		ingenic,nemc-tSTRV = <100>;
> -
> -		...
> -	};
> -};
> diff --git a/Documentation/devicetree/bindings/memory-controllers/ingenic,nemc-client.yaml b/Documentation/devicetree/bindings/memory-controllers/ingenic,nemc-client.yaml
> new file mode 100644
> index 000000000000..682e6f7e74fa
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/memory-controllers/ingenic,nemc-client.yaml
> @@ -0,0 +1,45 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/memory-controllers/ingenic,nemc-client.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title:
> +  Ingenic SoCs NAND / External Memory Controller (NEMC)
> +  client-specific properties
> +
> +maintainers:
> +  - Paul Cercueil <paul@...pouillou.net>
> +
> +description:
> +  This document lists the various properties that child nodes of the NEMC node
> +  can use.
> +
> +properties:

What about 'reg'? That should be required.

> +  ingenic,nemc-bus-width:
> +    allOf:
> +      - $ref: /schemas/types.yaml#/definitions/uint32
> +      - enum: [8, 16]
> +    description: Specifies the bus width in bits.
> +
> +  ingenic,nemc-tAS:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Address setup time in nanoseconds.
> +
> +  ingenic,nemc-tAH:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Address hold time in nanoseconds.
> +
> +  ingenic,nemc-tBP:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Burst pitch time in nanoseconds.
> +
> +  ingenic,nemc-tAW:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Address wait time in nanoseconds.
> +
> +  ingenic,nemc-tSTRV:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Static memory recovery time in nanoseconds.

I think I'd just combine this into 1 file.

> +
> +...
> diff --git a/Documentation/devicetree/bindings/memory-controllers/ingenic,nemc.yaml b/Documentation/devicetree/bindings/memory-controllers/ingenic,nemc.yaml
> new file mode 100644
> index 000000000000..c7fd28462fd8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/memory-controllers/ingenic,nemc.yaml
> @@ -0,0 +1,95 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/memory-controllers/ingenic,nemc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Ingenic SoCs NAND / External Memory Controller (NEMC) devicetree bindings
> +
> +maintainers:
> +  - Paul Cercueil <paul@...pouillou.net>
> +
> +properties:
> +  $nodename:
> +    pattern: "^memory-controller@[0-9a-f]+$"
> +
> +  compatible:
> +    oneOf:
> +      - enum:
> +        - ingenic,jz4740-nemc
> +        - ingenic,jz4780-nemc
> +      - items:
> +        - const: ingenic,jz4725b-nemc
> +        - const: ingenic,jz4740-nemc
> +
> +  "#address-cells":
> +    const: 2
> +
> +  "#size-cells":
> +    const: 1
> +
> +  ranges: true
> +
> +  reg:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +patternProperties:
> +  "^(nand-controller|ethernet)@[0-9]+$":

Presumably you could have other types of child nodes?

> +    type: object
> +    allOf:
> +      - $ref: ingenic,nemc-client.yaml#
> +
> +required:
> +  - compatible
> +  - "#address-cells"
> +  - "#size-cells"
> +  - ranges
> +  - reg
> +  - clocks
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/jz4780-cgu.h>
> +    #include <dt-bindings/gpio/gpio.h>
> +    nemc: memory-controller@...10000 {
> +      compatible = "ingenic,jz4780-nemc";
> +      reg = <0x13410000 0x10000>;
> +      #address-cells = <2>;
> +      #size-cells = <1>;
> +      ranges = <1 0 0x1b000000 0x1000000>,
> +         <2 0 0x1a000000 0x1000000>,
> +         <3 0 0x19000000 0x1000000>,
> +         <4 0 0x18000000 0x1000000>,
> +         <5 0 0x17000000 0x1000000>,
> +         <6 0 0x16000000 0x1000000>;
> +
> +      clocks = <&cgu JZ4780_CLK_NEMC>;
> +
> +      ethernet@6 {
> +        compatible = "davicom,dm9000";
> +        davicom,no-eeprom;
> +
> +        pinctrl-names = "default";
> +        pinctrl-0 = <&pins_nemc_cs6>;
> +
> +        reg = <6 0 1>, /* addr */
> +              <6 2 1>; /* data */
> +
> +        ingenic,nemc-tAS = <15>;
> +        ingenic,nemc-tAH = <10>;
> +        ingenic,nemc-tBP = <20>;
> +        ingenic,nemc-tAW = <50>;
> +        ingenic,nemc-tSTRV = <100>;
> +
> +        reset-gpios = <&gpf 12 GPIO_ACTIVE_HIGH>;
> +        vcc-supply = <&eth0_power>;
> +
> +        interrupt-parent = <&gpe>;
> +        interrupts = <19 4>;
> +      };
> +    };
> -- 
> 2.26.2
>