T4 - Require setting Input MUX values

Some of the SPI pins for SPI1 and SPI2 require
changing the Input chain mux registers.  So those register pointers and values are not stored in the SPI object and are updated as part of the begin

SPI.cpp

@@ -1293,6 +1293,12 @@ void SPIClass::begin()
 	*(portConfigRegister(hardware().mosi_pin [mosi_pin_index])) = hardware().mosi_mux[mosi_pin_index];
 	*(portConfigRegister(hardware().sck_pin [sck_pin_index])) = hardware().sck_mux[sck_pin_index];
 
+	// Set the Mux pins 
+	//Serial.println("SPI: Set Input select registers");
+	hardware().sck_select_input_register = hardware().sck_select_val;
+	hardware().sdi_select_input_register = hardware().sdi_select_val;
+	hardware().sdo_select_input_register = hardware().sdo_select_val;
+
 	//digitalWriteFast(10, HIGH);
 	//pinMode(10, OUTPUT);
 	//digitalWriteFast(10, HIGH);
@@ -1398,7 +1404,11 @@ const SPIClass::SPI_Hardware_t  SPIClass::spiclass_lpspi4_hardware = {
 	3 | 0x10,
 	10,
 	3 | 0x10,
+	IOMUXC_LPSPI4_SCK_SELECT_INPUT, IOMUXC_LPSPI4_SDI_SELECT_INPUT, IOMUXC_LPSPI4_SDO_SELECT_INPUT, IOMUXC_LPSPI4_PCS0_SELECT_INPUT,
+	0, 0, 0, 0
 };
+
+
 SPIClass SPI((uintptr_t)&IMXRT_LPSPI4_S, (uintptr_t)&SPIClass::spiclass_lpspi4_hardware);
 
 #if defined(__IMXRT1062__)
@@ -1416,6 +1426,8 @@ const SPIClass::SPI_Hardware_t  SPIClass::spiclass_lpspi3_hardware = {
 	7 | 0x10,
 	0,
 	7 | 0x10,
+	IOMUXC_LPSPI3_SCK_SELECT_INPUT, IOMUXC_LPSPI3_SDI_SELECT_INPUT, IOMUXC_LPSPI3_SDO_SELECT_INPUT, IOMUXC_LPSPI3_PCS0_SELECT_INPUT,
+	1, 1, 0, 0
 };
 SPIClass SPI1((uintptr_t)&IMXRT_LPSPI3_S, (uintptr_t)&SPIClass::spiclass_lpspi3_hardware);
 
@@ -1432,6 +1444,8 @@ const SPIClass::SPI_Hardware_t  SPIClass::spiclass_lpspi1_hardware = {
 	4 | 0x10,
 	36,
 	4 | 0x10,
+	IOMUXC_LPSPI1_SCK_SELECT_INPUT, IOMUXC_LPSPI1_SDI_SELECT_INPUT, IOMUXC_LPSPI1_SDO_SELECT_INPUT, IOMUXC_LPSPI1_PCS0_SELECT_INPUT,
+	1, 1, 1, 0
 };
 SPIClass SPI2((uintptr_t)&IMXRT_LPSPI1_S, (uintptr_t)&SPIClass::spiclass_lpspi1_hardware);
 #endif

SPI.h

@@ -1111,6 +1111,15 @@ public:
 		const uint32_t  sck_mux[CNT_SCK_PINS];
 		const uint8_t  cs_pin[CNT_CS_PINS];
 		const uint32_t  cs_mux[CNT_CS_PINS];
+
+		volatile uint32_t &sck_select_input_register;
+		volatile uint32_t &sdi_select_input_register;
+		volatile uint32_t &sdo_select_input_register;
+		volatile uint32_t &pcs0_select_input_register;
+		const uint8_t sck_select_val;
+		const uint8_t sdi_select_val;
+		const uint8_t sdo_select_val;
+		const uint8_t pcs0_select_val;
 	} SPI_Hardware_t;
 	static const SPI_Hardware_t spiclass_lpspi4_hardware;
 #if defined(__IMXRT1062__)