1Renesas RZ/A2 combined Pin and GPIO controller
2
3The Renesas SoCs of the RZ/A2 series feature a combined Pin and GPIO controller.
4Pin multiplexing and GPIO configuration is performed on a per-pin basis.
5Each port features up to 8 pins, each of them configurable for GPIO
6function (port mode) or in alternate function mode.
7Up to 8 different alternate function modes exist for each single pin.
8
9Pin controller node
10-------------------
11
12Required properties:
13  - compatible: shall be:
14    - "renesas,r7s9210-pinctrl": for RZ/A2M
15  - reg
16    Address base and length of the memory area where the pin controller
17    hardware is mapped to.
18  - gpio-controller
19    This pin controller also controls pins as GPIO
20  - #gpio-cells
21    Must be 2
22  - gpio-ranges
23    Expresses the total number of GPIO ports/pins in this SoC
24
25Example: Pin controller node for RZ/A2M SoC (r7s9210)
26
27	pinctrl: pin-controller@fcffe000 {
28		compatible = "renesas,r7s9210-pinctrl";
29		reg = <0xfcffe000 0x1000>;
30
31		gpio-controller;
32		#gpio-cells = <2>;
33		gpio-ranges = <&pinctrl 0 0 176>;
34	};
35
36Sub-nodes
37---------
38
39The child nodes of the pin controller designate pins to be used for
40specific peripheral functions or as GPIO.
41
42- Pin multiplexing sub-nodes:
43  A pin multiplexing sub-node describes how to configure a set of
44  (or a single) pin in some desired alternate function mode.
45  The values for the pinmux properties are a combination of port name, pin
46  number and the desired function index. Use the RZA2_PINMUX macro located
47  in include/dt-bindings/pinctrl/r7s9210-pinctrl.h to easily define these.
48  For assigning GPIO pins, use the macro RZA2_PIN also in r7s9210-pinctrl.h
49  to express the desired port pin.
50
51  Required properties:
52    - pinmux:
53      integer array representing pin number and pin multiplexing configuration.
54      When a pin has to be configured in alternate function mode, use this
55      property to identify the pin by its global index, and provide its
56      alternate function configuration number along with it.
57      When multiple pins are required to be configured as part of the same
58      alternate function they shall be specified as members of the same
59      argument list of a single "pinmux" property.
60      Helper macros to ease assembling the pin index from its position
61      (port where it sits on and pin number) and alternate function identifier
62      are provided by the pin controller header file at:
63      <dt-bindings/pinctrl/r7s9210-pinctrl.h>
64      Integers values in "pinmux" argument list are assembled as:
65      ((PORT * 8 + PIN) | MUX_FUNC << 16)
66
67  Example: Board specific pins configuration
68
69	&pinctrl {
70		/* Serial Console */
71		scif4_pins: serial4 {
72			pinmux = <RZA2_PINMUX(PORT9, 0, 4)>,	/* TxD4 */
73				 <RZA2_PINMUX(PORT9, 1, 4)>;	/* RxD4 */
74		};
75	};
76
77  Example: Assigning a GPIO:
78
79	leds {
80		status = "okay";
81		compatible = "gpio-leds";
82
83		led0 {
84			/* P6_0 */
85			gpios = <&pinctrl RZA2_PIN(PORT6, 0) GPIO_ACTIVE_HIGH>;
86		};
87	};
88