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+Renesas RZ/A2 combined Pin and GPIO controller
+
+The Renesas SoCs of the RZ/A2 series feature a combined Pin and GPIO controller.
+Pin multiplexing and GPIO configuration is performed on a per-pin basis.
+Each port features up to 8 pins, each of them configurable for GPIO
+function (port mode) or in alternate function mode.
+Up to 8 different alternate function modes exist for each single pin.
+
+Pin controller node
+-------------------
+
+Required properties:
+ - compatible: shall be:
+ - "renesas,r7s9210-pinctrl": for RZ/A2M
+ - reg
+ Address base and length of the memory area where the pin controller
+ hardware is mapped to.
+ - gpio-controller
+ This pin controller also controls pins as GPIO
+ - #gpio-cells
+ Must be 2
+ - gpio-ranges
+ Expresses the total number of GPIO ports/pins in this SoC
+
+Example: Pin controller node for RZ/A2M SoC (r7s9210)
+
+ pinctrl: pin-controller@fcffe000 {
+ compatible = "renesas,r7s9210-pinctrl";
+ reg = <0xfcffe000 0x1000>;
+
+ gpio-controller;
+ #gpio-cells = <2>;
+ gpio-ranges = <&pinctrl 0 0 176>;
+ };
+
+Sub-nodes
+---------
+
+The child nodes of the pin controller designate pins to be used for
+specific peripheral functions or as GPIO.
+
+- Pin multiplexing sub-nodes:
+ A pin multiplexing sub-node describes how to configure a set of
+ (or a single) pin in some desired alternate function mode.
+ The values for the pinmux properties are a combination of port name, pin
+ number and the desired function index. Use the RZA2_PINMUX macro located
+ in include/dt-bindings/pinctrl/r7s9210-pinctrl.h to easily define these.
+ For assigning GPIO pins, use the macro RZA2_PIN also in r7s9210-pinctrl.h
+ to express the desired port pin.
+
+ Required properties:
+ - pinmux:
+ integer array representing pin number and pin multiplexing configuration.
+ When a pin has to be configured in alternate function mode, use this
+ property to identify the pin by its global index, and provide its
+ alternate function configuration number along with it.
+ When multiple pins are required to be configured as part of the same
+ alternate function they shall be specified as members of the same
+ argument list of a single "pinmux" property.
+ Helper macros to ease assembling the pin index from its position
+ (port where it sits on and pin number) and alternate function identifier
+ are provided by the pin controller header file at:
+ <dt-bindings/pinctrl/r7s9210-pinctrl.h>
+ Integers values in "pinmux" argument list are assembled as:
+ ((PORT * 8 + PIN) | MUX_FUNC << 16)
+
+ Example: Board specific pins configuration
+
+ &pinctrl {
+ /* Serial Console */
+ scif4_pins: serial4 {
+ pinmux = <RZA2_PINMUX(PORT9, 0, 4)>, /* TxD4 */
+ <RZA2_PINMUX(PORT9, 1, 4)>; /* RxD4 */
+ };
+ };
+
+ Example: Assigning a GPIO:
+
+ leds {
+ status = "okay";
+ compatible = "gpio-leds";
+
+ led0 {
+ /* P6_0 */
+ gpios = <&pinctrl RZA2_PIN(PORT6, 0) GPIO_ACTIVE_HIGH>;
+ };
+ };
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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Defines macros and constants for Renesas RZ/A2 pin controller pin
+ * muxing functions.
+ */
+#ifndef __DT_BINDINGS_PINCTRL_RENESAS_RZA2_H
+#define __DT_BINDINGS_PINCTRL_RENESAS_RZA2_H
+
+#define RZA2_PINS_PER_PORT 8
+
+/* Port names as labeled in the Hardware Manual */
+#define PORT0 0
+#define PORT1 1
+#define PORT2 2
+#define PORT3 3
+#define PORT4 4
+#define PORT5 5
+#define PORT6 6
+#define PORT7 7
+#define PORT8 8
+#define PORT9 9
+#define PORTA 10
+#define PORTB 11
+#define PORTC 12
+#define PORTD 13
+#define PORTE 14
+#define PORTF 15
+#define PORTG 16
+#define PORTH 17
+/* No I */
+#define PORTJ 18
+#define PORTK 19
+#define PORTL 20
+#define PORTM 21 /* Pins PM_0/1 are labeled JP_0/1 in HW manual */
+
+/*
+ * Create the pin index from its bank and position numbers and store in
+ * the upper 16 bits the alternate function identifier
+ */
+#define RZA2_PINMUX(b, p, f) ((b) * RZA2_PINS_PER_PORT + (p) | (f << 16))
+
+/*
+ * Convert a port and pin label to its global pin index
+ */
+ #define RZA2_PIN(port, pin) ((port) * RZA2_PINS_PER_PORT + (pin))
+
+#endif /* __DT_BINDINGS_PINCTRL_RENESAS_RZA2_H */