Re: [PATCH v5 1/2] dt-bindings: at24: convert the binding document to yaml

Rob Herring
2019-10-01T13:37:47Z

On Mon, Sep 30, 2019 at 10:59:56AM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
>
> Convert the binding document for at24 EEPROMs from txt to yaml. The
> compatible property uses a regex pattern to address all the possible
> combinations of "vendor,model" strings.
>
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> [robh: rework compatible schema, fix missing allOf for $ref, fix errors in example]
> Signed-off-by: Rob Herring <robh@kernel.org>
> [Bartosz: added comments explaining the compatible property]
> Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> ---
> .../devicetree/bindings/eeprom/at24.txt | 90 +--------
> .../devicetree/bindings/eeprom/at24.yaml | 179 ++++++++++++++++++
> MAINTAINERS | 2 +-
> 3 files changed, 181 insertions(+), 90 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/eeprom/at24.yaml

> diff --git a/Documentation/devicetree/bindings/eeprom/at24.yaml b/Documentation/devicetree/bindings/eeprom/at24.yaml
> new file mode 100644
> index 000000000000..aee0890d3b7a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/eeprom/at24.yaml
> @@ -0,0 +1,179 @@
> +# SPDX-License-Identifier: GPL-2.0-only
> +# Copyright 2019 BayLibre SAS
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/eeprom/at24.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: I2C EEPROMs compatible with Atmel's AT24
> +
> +maintainers:
> + - Bartosz Golaszewski <bgolaszewski@baylibre.com>
> +
> +select:
> + properties:
> + compatible:
> + contains:
> + pattern: "^atmel,(24(c|cs|mac)[0-9]+|spd)$"
> + required:
> + - compatible
> +
> +properties:
> + $nodename:
> + pattern: "^eeprom@[0-9a-f]{1,2}$"
> +
> + # There are multiple known vendors who manufacture EEPROM chips compatible
> + # with Atmel's AT24. The compatible string requires either a single item
> + # if the memory comes from Atmel (in which case the vendor part must be
> + # 'atmel') or two items with the same 'model' part where the vendor part of
> + # the first one is the actual manufacturer and the second item is the
> + # corresponding 'atmel,<model>' from Atmel.
> + #
> + # While the below schema would technically allow the following:
> + #
> + # compatible = "atmel,24c01", "atmel,24c01";

This is prevented in the common 'compatible' schema that requires unique
items.

> + #
> + # this obviously must not be used.
> + compatible:
> + oneOf:
> + - allOf:
> + - minItems: 1
> + maxItems: 2
> + items:
> + - pattern: "^(atmel|catalyst|microchip|nxp|ramtron|renesas|rohm|st),(24(c|cs|mac)[0-9]+|spd)$"
> + - pattern: "^atmel,(24(c|cs|mac)[0-9]+|spd)$"
> + - oneOf:
> + - items:
> + pattern: c00$
> + - items:
> + pattern: c01$
> + - items:
> + pattern: c02$
> + - items:
> + pattern: c04$
> + - items:
> + pattern: c08$

Need to add the 'cs' variants I missed.

> + - items:
> + pattern: c16$
> + - items:
> + pattern: cs16$
> + - items:
> + pattern: c32$
> + - items:
> + pattern: cs32$
> + - items:
> + pattern: c64$
> + - items:
> + pattern: cs64$
> + - items:
> + pattern: c128$
> + - items:
> + pattern: cs128$
> + - items:
> + pattern: c256$
> + - items:
> + pattern: cs256$
> + - items:
> + pattern: c512$
> + - items:
> + pattern: cs512$
> + - items:
> + pattern: c1024$
> + - items:
> + pattern: cs1024$
> + - items:
> + pattern: c2048$
> + - items:
> + pattern: cs2048$
> + - items:
> + pattern: spd$
> + # These are special cases that don't conform to the above pattern.
> + # Each requires a standard at24 model as fallback.
> + - items:
> + - const: rohm,br24t01
> + - const: atmel,24c01
> + - items:
> + - const: nxp,se97b
> + - const: atmel,24c02
> + - items:
> + - const: renesas,r1ex24002
> + - const: atmel,24c02
> + - items:
> + - const: renesas,r1ex24016
> + - const: atmel,24c16
> + - items:
> + - const: renesas,r1ex24128
> + - const: atmel,24c128
> +
> + reg:
> + maxItems: 1
> +
> + pagesize:
> + allOf:
> + - $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + The length of the pagesize for writing. Please consult the
> + manual of your device, that value varies a lot. A wrong value
> + may result in data loss! If not specified, a safety value of
> + '1' is used which will be very slow.
> + enum: [ 1, 8, 16, 32, 64, 128, 258 ]
> + default: 1
> +
> + read-only:
> + $ref: /schemas/types.yaml#definitions/flag
> + description:
> + Disables writes to the eeprom.
> +
> + size:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Total eeprom size in bytes.
> +
> + no-read-rollover:
> + $ref: /schemas/types.yaml#definitions/flag
> + description:
> + Indicates that the multi-address eeprom does not automatically roll
> + over reads to the next slave address. Please consult the manual of
> + your device.
> +
> + wp-gpios:
> + description:
> + GPIO to which the write-protect pin of the chip is connected.
> + maxItems: 1
> +
> + address-width:
> + allOf:
> + - $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Number of address bits.
> + default: 8
> + enum: [ 8, 16 ]
> +
> + num-addresses:
> + allOf:
> + - $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Total number of i2c slave addresses this device takes.
> + default: 1
> + minimum: 1
> + maximum: 8
> +
> +required:
> + - compatible
> + - reg
> +
> +examples:
> + - |
> + i2c {
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + eeprom@52 {
> + compatible = "microchip,24c32", "atmel,24c32";
> + reg = <0x52>;
> + pagesize = <32>;
> + wp-gpios = <&gpio1 3 0>;
> + num-addresses = <8>;
> + };
> + };
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 296de2b51c83..320fc8bba872 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2699,7 +2699,7 @@ M: Bartosz Golaszewski <bgolaszewski@baylibre.com>
> L: linux-i2c@vger.kernel.org
> T: git git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git
> S: Maintained
> -F: Documentation/devicetree/bindings/eeprom/at24.txt
> +F: Documentation/devicetree/bindings/eeprom/at24.yaml
> F: drivers/misc/eeprom/at24.c
>
> ATA OVER ETHERNET (AOE) DRIVER
> --
> 2.23.0
>