MX28: m28evk: Align SSP clock speed

Align the SSP clock speed with oscilator to achieve
higher transfer stability.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Stefano Babic <sbabic@denx.de>

board/denx/m28evk/m28evk.c

@@ -49,8 +49,8 @@ int board_early_init_f(void)
 
 	/* SSP0 clock at 96MHz */
 	mx28_set_sspclk(MXC_SSPCLK0, 96000, 0);
-	/* SSP2 clock at 96MHz */
-	mx28_set_sspclk(MXC_SSPCLK2, 96000, 0);
+	/* SSP2 clock at 160MHz */
+	mx28_set_sspclk(MXC_SSPCLK2, 160000, 0);
 
 #ifdef	CONFIG_CMD_USB
 	mxs_iomux_setup_pad(MX28_PAD_SSP2_SS1__USB1_OVERCURRENT);

include/configs/m28evk.h

@@ -253,11 +253,11 @@
 #define	CONFIG_SPI_FLASH_STMICRO
 #define	CONFIG_SF_DEFAULT_CS		2
 #define	CONFIG_SF_DEFAULT_MODE		SPI_MODE_0
-#define	CONFIG_SF_DEFAULT_SPEED		24000000
+#define	CONFIG_SF_DEFAULT_SPEED		40000000
 
 #define	CONFIG_ENV_SPI_CS		0
 #define	CONFIG_ENV_SPI_BUS		2
-#define	CONFIG_ENV_SPI_MAX_HZ		24000000
+#define	CONFIG_ENV_SPI_MAX_HZ		40000000
 #define	CONFIG_ENV_SPI_MODE		SPI_MODE_0
 #endif
 #endif