drivers: flash_stm32_qspi: add st,read-id-dummy-cycles

Add new device tree property specifying the number of
dummy-cycles required when reading the JEDEC ID.

The Arduino Opta has an at25sf128a with JEDEC ID 1F 89 01.
The PR below adds support for this, but the id read is 01 1F 89.
Changing DummyCycles to 16 causes the correct value to be read.

#89539

Signed-off-by: Mark O'Donovan <shiftee@posteo.net>

Author: shiftee

drivers/flash/flash_stm32_qspi.c

@@ -317,11 +317,12 @@ static int qspi_read_jedec_id(const struct device *dev, uint8_t *id)
 {
 	struct flash_stm32_qspi_data *dev_data = dev->data;
 	uint8_t data[JESD216_READ_ID_LEN];
+	uint32_t dummy_cycles = DT_INST_PROP(0, st_read_id_dummy_cycles);
 
 	QSPI_CommandTypeDef cmd = {
 		.Instruction = JESD216_CMD_READ_ID,
 		.AddressSize = QSPI_ADDRESS_NONE,
-		.DummyCycles = 8,
+		.DummyCycles = dummy_cycles,
 		.InstructionMode = QSPI_INSTRUCTION_1_LINE,
 		.AddressMode = QSPI_ADDRESS_1_LINE,
 		.DataMode = QSPI_DATA_1_LINE,
@@ -333,7 +334,7 @@ static int qspi_read_jedec_id(const struct device *dev, uint8_t *id)
 	hal_ret = HAL_QSPI_Command_IT(&dev_data->hqspi, &cmd);
 
 	if (hal_ret != HAL_OK) {
-		LOG_ERR("%d: Failed to send OSPI instruction", hal_ret);
+		LOG_ERR("%d: Failed to send QSPI instruction", hal_ret);
 		return -EIO;
 	}
 

dts/bindings/flash_controller/st,stm32-qspi-nor.yaml

@@ -71,3 +71,8 @@ properties:
       protection register that initializes to write-protected.  Use this
       property to indicate that the BPR must be unlocked before write
       operations can proceed.
+
+  st,read-id-dummy-cycles:
+    type: int
+    default: 8
+    description: The number of dummy-cycles required when reading jedec id