i2c: target: eeprom_target: add read-only property

In case the EEPROM data stored in the buffer shall be not writable from the I2C interface, the read-only property can now be set in the device tree. Signed-off-by: Manuel Aebischer <[email protected]>
zephyrproject-rtos · Jul 11, 2024 · 0aa34cf · 0aa34cf
1 parent 24773a1
commit 0aa34cf
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Showing 2 changed files with 7 additions and 1 deletion.
diff --git a/drivers/i2c/target/eeprom_target.c b/drivers/i2c/target/eeprom_target.c
@@ -24,6 +24,7 @@ struct i2c_eeprom_target_data {
 	uint32_t buffer_idx;
 	uint32_t idx_write_cnt;
 	uint8_t address_width;
+	bool read_only;
 };
 
 struct i2c_eeprom_target_config {
@@ -129,7 +130,7 @@ static int eeprom_target_write_received(struct i2c_target_config *config,
 
 		data->buffer_idx = val | (data->buffer_idx << 8);
 		data->idx_write_cnt++;
-	} else {
+	} else if (!data->read_only) {
 		data->buffer[data->buffer_idx++] = val;
 	}
 
@@ -254,6 +255,8 @@ static int i2c_eeprom_target_init(const struct device *dev)
 		i2c_eeprom_target_##inst##_dev_data = {			\
 			.address_width = DT_INST_PROP_OR(inst,		\
 					address_width, 8),		\
+			.read_only = DT_INST_PROP_OR(inst,		\
+					read_only, 8),			\
 		};							\
 									\
 	static uint8_t							\

diff --git a/dts/bindings/mtd/zephyr,i2c-target-eeprom.yaml b/dts/bindings/mtd/zephyr,i2c-target-eeprom.yaml
@@ -13,3 +13,6 @@ properties:
     description: |
       Number of address bits used to address the EEPROM. If not specified
       the EEPROM is assumed to have a 8-bit address.
+  read-only:
+    type: boolean
+    description: set this property if the EERPOM is read-only.