linux-kernel - [PATCH v4 1/3] dt-bindings: eeprom: Add ST M24LR support

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Message-ID: <20250608182714.3359441-2-abd.masalkhi@gmail.com>
Date: Sun,  8 Jun 2025 18:27:12 +0000
From: Abd-Alrhman Masalkhi <abd.masalkhi@...il.com>
To: linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Cc: arnd@...db.de,
	gregkh@...uxfoundation.org,
	W_Armin@....de,
	luoyifan@...s.chinamobile.com,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	abd.masalkhi@...il.com
Subject: [PATCH v4 1/3] 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 <abd.masalkhi@...il.com>
---
Changes in v4:
 - Moved the binding file to the eeprom/ directory
 - Updated reg property to use items: with per-address descriptions
   instead of minItems/maxItems
---
 .../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 000000000000..0a0820e9d11f
--- /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 <abd.masalkhi@...il.com>
+
+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 */
+      };
+    };
+...
-- 
2.43.0