drivers: flash: flexspi_mx25um51345g: get max speed from dts

The maximum speed should be configured individually for each board
since it depends on the layout and the controller's flexspi capabilities.

Signed-off-by: Andre Heinemans <[email protected]>

Author: AndreHeinemans-NXP

boards/nxp/mimxrt595_evk/mimxrt595_evk_mimxrt595s_cm33.dts

@@ -400,7 +400,7 @@ zephyr_udc0: &usbhs {
 		/* MX25UM51245G is 64MB, 512MBit flash part */
 		size = <DT_SIZE_M(64 * 8)>;
 		reg = <0>;
-		spi-max-frequency = <DT_FREQ_M(200)>;
+		spi-max-frequency = <DT_FREQ_M(120)>;
 		status = "okay";
 		jedec-id = [c2 81 3a];
 		erase-block-size = <DT_SIZE_K(4)>;

boards/nxp/mimxrt685_evk/mimxrt685_evk_mimxrt685s_cm33.dts

@@ -265,7 +265,7 @@ i2s1: &flexcomm3 {
 		/* MX25UM51245G is 64MB, 512MBit flash part */
 		size = <DT_SIZE_M(64 * 8)>;
 		reg = <2>;
-		spi-max-frequency = <DT_FREQ_M(200)>;
+		spi-max-frequency = <DT_FREQ_M(120)>;
 		status = "okay";
 		jedec-id = [c2 81 3a];
 		erase-block-size = <DT_SIZE_K(4)>;

boards/nxp/vmu_rt1170/vmu_rt1170.dtsi

@@ -205,7 +205,7 @@
 		/* MX25UM51245G is 64MB, 512MBit flash part */
 		size = <DT_SIZE_M(64 * 8)>;
 		reg = <0>;
-		spi-max-frequency = <DT_FREQ_M(200)>;
+		spi-max-frequency = <DT_FREQ_M(120)>;
 		status = "okay";
 		jedec-id = [c2 81 3a];
 		erase-block-size = <DT_SIZE_K(4)>;

drivers/flash/flash_mcux_flexspi_mx25um51345g.c

@@ -600,7 +600,8 @@ static DEVICE_API(flash, flash_flexspi_nor_api) = {
 
 #define FLASH_FLEXSPI_DEVICE_CONFIG(n)					\
 	{								\
-		.flexspiRootClk = MHZ(120),				\
+		.flexspiRootClk =					\
+			DT_INST_PROP_OR(n, spi_max_frequency, MHZ(200)),\
 		.flashSize = DT_INST_PROP(n, size) / 8 / KB(1),		\
 		.CSIntervalUnit =					\
 			CS_INTERVAL_UNIT(				\