[nrf noup] drivers: flash: Fix spi_nor_set_address_mode and exit_dpd

There was unneeded check for enter_4byte_addr_exist, that would be set
by existence of enter-4byte-addr property, as the function is generic
DTS/SFPD implementation and parsed parameter to obtain the information.
The check was breaking usage of SFDP as with SFDP the parameter may
never be provided.
The commit removes the check and the enter_4byte_addr_exist, as it does
not seem needed for anything.

The incorrectly placed conditional compilation for DPD exit sequence
has broken DPD exit in case where such sequence is not needed.

Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
Signed-off-by: Jan Tore Guggedal <jantore.guggedal@nordicsemi.no>

drivers/flash/spi_nor.c

@@ -155,7 +155,6 @@ struct spi_nor_config {
 	bool dpd_exist:1;
 	bool dpd_wakeup_sequence_exist:1;
 	bool mxicy_mx25r_power_mode_exist:1;
-	bool enter_4byte_addr_exist:1;
 	bool reset_gpios_exist:1;
 	bool requires_ulbpr_exist:1;
 	bool wp_gpios_exist:1;
@@ -520,10 +519,11 @@ static int exit_dpd(const struct device *const dev)
 	const struct spi_nor_config *cfg = dev->config;
 
 	if (cfg->dpd_exist) {
+#if ANY_INST_HAS_DPD
 		delay_until_exit_dpd_ok(dev);
 
-#if ANY_INST_HAS_DPD_WAKEUP_SEQUENCE
 		if (cfg->dpd_wakeup_sequence_exist) {
+#if ANY_INST_HAS_DPD_WAKEUP_SEQUENCE
 			/* Assert CSn and wait for tCRDP.
 			 *
 			 * Unfortunately the SPI API doesn't allow us to
@@ -536,6 +536,7 @@ static int exit_dpd(const struct device *const dev)
 
 			/* Deassert CSn and wait for tRDP */
 			k_sleep(K_MSEC(cfg->t_rdp_ms));
+#endif /* DPD_WAKEUP_SEQUENCE */
 		} else {
 			ret = spi_nor_cmd_write(dev, SPI_NOR_CMD_RDPD);
 
@@ -547,7 +548,7 @@ static int exit_dpd(const struct device *const dev)
 			}
 #endif /* T_EXIT_DPD */
 		}
-#endif /* DPD_WAKEUP_SEQUENCE */
+#endif /* ANY_INST_HAS_DPD */
 	}
 	return ret;
 }
@@ -1036,10 +1037,8 @@ static int spi_nor_read_jedec_id(const struct device *dev,
 static int spi_nor_set_address_mode(const struct device *dev,
 				    uint8_t enter_4byte_addr)
 {
-	const struct spi_nor_config *cfg = dev->config;
-	int ret = -ENOSYS;
+	int ret = 0;
 
-	if (cfg->enter_4byte_addr_exist) {
 	/* Do nothing if not provided (either no bits or all bits
 	 * set).
 	 */
@@ -1074,7 +1073,6 @@ static int spi_nor_set_address_mode(const struct device *dev,
 	}
 
 	release_device(dev);
-	}
 
 	return ret;
 }
@@ -1664,7 +1662,6 @@ static const struct flash_driver_api spi_nor_api = {
 	.dpd_exist = DT_INST_PROP(idx, has_dpd),						\
 	.dpd_wakeup_sequence_exist = DT_INST_NODE_HAS_PROP(idx, dpd_wakeup_sequence),		\
 	.mxicy_mx25r_power_mode_exist = DT_INST_NODE_HAS_PROP(idx, mxicy_mx25r_power_mode),	\
-	.enter_4byte_addr_exist = DT_INST_NODE_HAS_PROP(idx, enter_4byte_addr),			\
 	.reset_gpios_exist = DT_INST_NODE_HAS_PROP(idx, reset_gpios),				\
 	.requires_ulbpr_exist =  DT_INST_PROP(idx, requires_ulbpr),				\
 	.wp_gpios_exist = DT_INST_NODE_HAS_PROP(idx, wp_gpios),					\