arm64: dts: imx8mp: Add pinctrl config definitions

Currently to configure each IOMUXC_SW_PAD_CTL_PAD the raw value of this
register is written in the dts, these values are not obvious. Add defines
which describe the fields of this register which can be or-ed together to
produce readable settings.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Maud Spierings <maudspierings@gocontroll.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm64/boot/dts/freescale/imx8mp-pinfunc.h

@@ -6,6 +6,39 @@
 #ifndef __DTS_IMX8MP_PINFUNC_H
 #define __DTS_IMX8MP_PINFUNC_H
 
+/* Drive Strength */
+#define MX8MP_DSE_X1		0x0
+#define MX8MP_DSE_X2		0x4
+#define MX8MP_DSE_X4		0x2
+#define MX8MP_DSE_X6		0x6
+
+/* Slew Rate */
+#define MX8MP_FSEL_FAST		0x10
+#define MX8MP_FSEL_SLOW		0x0
+
+/* Open Drain */
+#define MX8MP_ODE_ENABLE	0x20
+#define MX8MP_ODE_DISABLE	0x0
+
+#define MX8MP_PULL_DOWN		0x0
+#define MX8MP_PULL_UP		0x40
+
+/* Hysteresis */
+#define MX8MP_HYS_CMOS		0x0
+#define MX8MP_HYS_SCHMITT	0x80
+
+#define MX8MP_PULL_ENABLE	0x100
+#define MX8MP_PULL_DISABLE	0x0
+
+/* SION force input mode */
+#define MX8MP_SION		0x40000000
+
+/* long defaults */
+#define MX8MP_USDHC_DATA_DEFAULT (MX8MP_FSEL_FAST | MX8MP_PULL_UP | \
+				  MX8MP_HYS_SCHMITT | MX8MP_PULL_ENABLE)
+#define MX8MP_I2C_DEFAULT (MX8MP_DSE_X6 | MX8MP_PULL_UP | MX8MP_HYS_SCHMITT | \
+			   MX8MP_PULL_ENABLE | MX8MP_SION)
+
 /*
  * The pin function ID is a tuple of
  * <mux_reg conf_reg input_reg mux_mode input_val>