boards/soc: nxp: MCXA, imxrt11xx: reconfigure clock source of lpspi

In spi loopback test, high bandrate is 16Mbps while some source of lpspi
are too low to support this bandrate. According the reference mannual,
to support 16Mbps, Input frequency at least should be 2*16MHz.
Update LPSPI input freq to maximum to get more accurate band rate
because band rate must be divisible by input freq.

Signed-off-by: Raymond Lei <[email protected]>

Author: Raymond0225

boards/nxp/frdm_mcxa156/board.c

@@ -199,13 +199,15 @@ void board_early_init_hook(void)
 #endif
 
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(lpspi0))
+	/* Configure input clock to be able to reach the datasheet specified band rate. */
 	CLOCK_SetClockDiv(kCLOCK_DivLPSPI0, 1u);
-	CLOCK_AttachClk(kFRO12M_to_LPSPI0);
+	CLOCK_AttachClk(kFRO_HF_DIV_to_LPSPI0);
 #endif
 
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(lpspi1))
+	/* Configure input clock to be able to reach the datasheet specified band rate. */
 	CLOCK_SetClockDiv(kCLOCK_DivLPSPI1, 1u);
-	CLOCK_AttachClk(kFRO12M_to_LPSPI1);
+	CLOCK_AttachClk(kFRO_HF_DIV_to_LPSPI1);
 #endif
 
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(lptmr0))

boards/nxp/frdm_mcxn236/board.c

@@ -119,23 +119,27 @@ void board_early_init_hook(void)
 #endif
 
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(flexcomm1))
+	/* Configure input clock to be able to reach the datasheet specified SPI band rate. */
 	CLOCK_SetClkDiv(kCLOCK_DivFlexcom1Clk, 1u);
-	CLOCK_AttachClk(kFRO12M_to_FLEXCOMM1);
+	CLOCK_AttachClk(kFRO_HF_DIV_to_FLEXCOMM1);
 #endif
 
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(flexcomm2))
+	/* Configure input clock to be able to reach the datasheet specified SPI band rate. */
 	CLOCK_SetClkDiv(kCLOCK_DivFlexcom2Clk, 1u);
-	CLOCK_AttachClk(kFRO12M_to_FLEXCOMM2);
+	CLOCK_AttachClk(kFRO_HF_DIV_to_FLEXCOMM2);
 #endif
 
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(flexcomm3))
+	/* Configure input clock to be able to reach the datasheet specified SPI band rate. */
 	CLOCK_SetClkDiv(kCLOCK_DivFlexcom3Clk, 1u);
-	CLOCK_AttachClk(kFRO12M_to_FLEXCOMM3);
+	CLOCK_AttachClk(kFRO_HF_DIV_to_FLEXCOMM3);
 #endif
 
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(flexcomm4))
+	/* Configure input clock to be able to reach the datasheet specified SPI band rate. */
 	CLOCK_SetClkDiv(kCLOCK_DivFlexcom4Clk, 1u);
-	CLOCK_AttachClk(kFRO12M_to_FLEXCOMM4);
+	CLOCK_AttachClk(kFRO_HF_DIV_to_FLEXCOMM4);
 #endif
 
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(flexcomm5))

boards/nxp/frdm_mcxn947/board.c

@@ -148,23 +148,27 @@ void board_early_init_hook(void)
 #endif
 
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(flexcomm1))
+	/* Configure input clock to be able to reach the datasheet specified SPI band rate. */
 	CLOCK_SetClkDiv(kCLOCK_DivFlexcom1Clk, 1u);
-	CLOCK_AttachClk(kFRO12M_to_FLEXCOMM1);
+	CLOCK_AttachClk(kFRO_HF_DIV_to_FLEXCOMM1);
 #endif
 
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(flexcomm2))
+	/* Configure input clock to be able to reach the datasheet specified SPI band rate. */
 	CLOCK_SetClkDiv(kCLOCK_DivFlexcom2Clk, 1u);
-	CLOCK_AttachClk(kFRO12M_to_FLEXCOMM2);
+	CLOCK_AttachClk(kFRO_HF_DIV_to_FLEXCOMM2);
 #endif
 
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(flexcomm4))
+	/* Configure input clock to be able to reach the datasheet specified SPI band rate. */
 	CLOCK_SetClkDiv(kCLOCK_DivFlexcom4Clk, 1u);
-	CLOCK_AttachClk(kFRO12M_to_FLEXCOMM4);
+	CLOCK_AttachClk(kFRO_HF_DIV_to_FLEXCOMM4);
 #endif
 
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(flexcomm7))
+	/* Configure input clock to be able to reach the datasheet specified SPI band rate. */
 	CLOCK_SetClkDiv(kCLOCK_DivFlexcom7Clk, 1u);
-	CLOCK_AttachClk(kFRO12M_to_FLEXCOMM7);
+	CLOCK_AttachClk(kFRO_HF_DIV_to_FLEXCOMM7);
 #endif
 
 #if DT_NODE_HAS_STATUS_OKAY(DT_NODELABEL(os_timer))

soc/nxp/imxrt/imxrt10xx/soc.c

@@ -209,8 +209,9 @@ __weak void clock_init(void)
 #endif
 
 #ifdef CONFIG_SPI_MCUX_LPSPI
-	CLOCK_SetMux(kCLOCK_LpspiMux, 1); /* Set SPI source to USB1 PFD0 720M */
-	CLOCK_SetDiv(kCLOCK_LpspiDiv, 7); /* Set SPI divider to 8 */
+	/* Configure input clock to be able to reach the datasheet specified band rate. */
+	CLOCK_SetMux(kCLOCK_LpspiMux, 1); /* Set SPI source to USB1 PFD0 */
+	CLOCK_SetDiv(kCLOCK_LpspiDiv, 0); /* Set SPI divider to 1 */
 #endif
 
 #ifdef CONFIG_DISPLAY_MCUX_ELCDIF

soc/nxp/imxrt/imxrt11xx/soc.c

@@ -463,8 +463,8 @@ __weak void clock_init(void)
 #endif
 
 #ifdef CONFIG_SPI_MCUX_LPSPI
-	/* Configure lpspi using Osc48MDiv2 */
-	rootCfg.mux = kCLOCK_LPSPI1_ClockRoot_MuxOscRc48MDiv2;
+	/* Configure input clock to be able to reach the datasheet specified band rate. */
+	rootCfg.mux = kCLOCK_LPSPI1_ClockRoot_MuxOscRc400M;
 	rootCfg.div = 1;
 	CLOCK_SetRootClock(kCLOCK_Root_Lpspi1, &rootCfg);
 #endif