Add dt-bindings for Renesas r7s72100 pin controller header file.

Signed-off-by: Jacopo Mondi <jacopo+rene...@jmondi.org>
---
 include/dt-bindings/pinctrl/r7s72100-pinctrl.h | 36 ++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 include/dt-bindings/pinctrl/r7s72100-pinctrl.h

diff --git a/include/dt-bindings/pinctrl/r7s72100-pinctrl.h 
b/include/dt-bindings/pinctrl/r7s72100-pinctrl.h
new file mode 100644
index 0000000..170338b
--- /dev/null
+++ b/include/dt-bindings/pinctrl/r7s72100-pinctrl.h
@@ -0,0 +1,36 @@
+/*
+ * Defines macros and constants for Renesas RZ/A1 pin controller pin
+ * muxing functions.
+ */
+#ifndef __DT_BINDINGS_PINCTRL_RENESAS_RZA1_H
+#define __DT_BINDINGS_PINCTRL_RENESAS_RZA1_H
+
+#define RZA1_PINS_PER_PORT     16
+
+/* Create the pin index from its bank and position numbers */
+#define PIN(b, p)              ((b) * RZA1_PINS_PER_PORT + (p))
+
+/*
+ * Flags to apply to alternate function configuration
+ * All of the following are mutually exclusive.
+ */
+
+/*
+ * Pin is bi-directional.
+ * An alternate function that needs both input/output functionalities shall
+ * be configured as bidirectional.
+ * Eg. SDA/SCL pins of an I2c interface.
+ */
+#define BI_DIR                 (1 << 3)
+
+/*
+ * Flags used to ask software to drive the pin I/O direction overriding the
+ * alternate function configuration.
+ * Some alternate functions require software to force I/O direction of a pin,
+ * overriding the designated one.
+ * Refer to the HW manual to know when this flag shall be used.
+ */
+#define SWIO_IN                        (1 << 4)
+#define SWIO_OUT               (1 << 5)
+
+#endif
-- 
2.7.4

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