On Sun, Oct 24, 2021 at 5:40 PM Jesse Taube [off-list ref] wrote:

+/*
+ * The pin function ID is a tuple of
+ * <mux_reg conf_reg input_reg mux_mode input_val>
+ */
+
+#define MXRT1050_IOMUXC_GPIO_EMC_00_SEMC_DA00                          0x014 0x204 0x000 0x0 0x0
+#define MXRT1050_IOMUXC_GPIO_EMC_00_FLEXPWM4_PWM0_A                    0x014 0x204 0x494 0x1 0x0
+#define MXRT1050_IOMUXC_GPIO_EMC_00_LPSPI2_SCK                         0x014 0x204 0x500 0x2 0x1
+#define MXRT1050_IOMUXC_GPIO_EMC_00_XBAR_INOUT2                                0x014 0x204 0x60C 0x3 0x0
+#define MXRT1050_IOMUXC_GPIO_EMC_00_FLEXIO1_D00                                0x014 0x204 0x000 0x4 0x0
+#define MXRT1050_IOMUXC_GPIO_EMC_00_GPIO4_IO00                         0x014 0x204 0x000 0x5 0x0

The constants don't appear to be needed in this header at all, as the binding
looks completely generic with a tuple of five values, so  you could simply
open-code the numbers where they are used, no need to include these
in a driver.

        Arnd