From 46b4ddd2c4951c073a16bbf271221240fe2584e5 Mon Sep 17 00:00:00 2001 From: Abd-Alrhman Masalkhi Date: Thu, 17 Jul 2025 06:39:32 +0000 Subject: [PATCH] dt-bindings: eeprom: Add ST M24LR support Add support for STMicroelectronics M24LR RFID/NFC EEPROM chips. These devices use two I2C addresses: the primary address provides access to control and system parameter registers, while the secondary address is used for EEPROM access. Signed-off-by: Abd-Alrhman Masalkhi Reviewed-by: Krzysztof Kozlowski Link: https://lore.kernel.org/r/20250717063934.5083-2-abd.masalkhi@gmail.com Signed-off-by: Greg Kroah-Hartman --- .../devicetree/bindings/eeprom/st,m24lr.yaml | 52 +++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 Documentation/devicetree/bindings/eeprom/st,m24lr.yaml diff --git a/Documentation/devicetree/bindings/eeprom/st,m24lr.yaml b/Documentation/devicetree/bindings/eeprom/st,m24lr.yaml new file mode 100644 index 0000000000000..0a0820e9d11fa --- /dev/null +++ b/Documentation/devicetree/bindings/eeprom/st,m24lr.yaml @@ -0,0 +1,52 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/eeprom/st,m24lr.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: STMicroelectronics M24LR NFC/RFID EEPROM + +maintainers: + - Abd-Alrhman Masalkhi + +description: + STMicroelectronics M24LR series are dual-interface (RF + I2C) + EEPROM chips. These devices support I2C-based access to both + memory and a system area that controls authentication and configuration. + They expose two I2C addresses, one for the system parameter sector and + one for the EEPROM. + +allOf: + - $ref: /schemas/nvmem/nvmem.yaml# + +properties: + compatible: + enum: + - st,m24lr04e-r + - st,m24lr16e-r + - st,m24lr64e-r + + reg: + items: + - description: I2C address used for control/system registers + - description: I2C address used for EEPROM memory access + +required: + - compatible + - reg + +unevaluatedProperties: false + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + + eeprom@57 { + compatible = "st,m24lr04e-r"; + reg = <0x57>, /* primary-device */ + <0x53>; /* secondary-device */ + }; + }; +... -- 2.47.3