mtd: devices: add devicetree documentation for microchip 48l640

# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

%YAML 1.2

---

$id: "http://devicetree.org/schemas/mtd/microchip,mchp48l640.yaml#"

$schema: "http://devicetree.org/meta-schemas/core.yaml#"

title: Microchip 48l640 (and similar) serial EERAM bindings

maintainers:

  - Heiko Schocher <hs@denx.de>

description: |

  The Microchip 48l640 is a 8KByte EERAM connected via SPI.

  datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/20006055B.pdf

properties:

  compatible:

    items:

      - const: microchip,48l640

  reg:

    maxItems: 1

  spi-max-frequency: true

required:

  - compatible

  - reg

additionalProperties: false

examples:

  - |

    spi {

      #address-cells = <1>;

      #size-cells = <0>;

      eeram@0 {

        compatible = "microchip,48l640";

        reg = <0>;

        spi-max-frequency = <20000000>;

      };

    };

...