[PATCH 2/2] dt-bindings: pinctrl: Add RZ/A2 pinctrl and GPIO

[Chris Brandt <chris.brandt@renesas.com>]

Add device tree binding documentation and header file for Renesas R7S9210
(RZ/A2) SoCs.

Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
---
 .../bindings/pinctrl/renesas,rza2-pinctrl.txt      | 76 ++++++++++++++++++++++
 include/dt-bindings/pinctrl/r7s9210-pinctrl.h      | 47 +++++++++++++
 2 files changed, 123 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/pinctrl/renesas,rza2-pinctrl.txt
 create mode 100644 include/dt-bindings/pinctrl/r7s9210-pinctrl.h

diff --git a/Documentation/devicetree/bindings/pinctrl/renesas,rza2-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/renesas,rza2-pinctrl.txt
new file mode 100644
index 000000000000..5f338054f493
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/renesas,rza2-pinctrl.txt
@@ -0,0 +1,76 @@
+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: should be:
+    - "renesas,r7s9210-pinctrl": for RZ/A2M
+
+  - reg
+    address base and length of the memory area where the pin controller
+    hardware is mapped to.
+
+Optional properties:
+  - gpio-controller
+    Include this in order to enable GPIO functionality. When included, both
+    gpio_cells and gpio_ranges are then required.
+  - #gpio-cells
+    Must be 2
+  - gpio-ranges
+    Expresses the total number 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 0x9D1>;
+
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-ranges = <&pinctrl 0 0 176>;
+	};
+
+Sub-nodes
+---------
+
+The child nodes of the pin controller node describe a pin multiplexing
+function or a GPIO controller alternatively.
+
+- 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_ID also in r7s9210-pinctrl.h
+  to express the desired port pin.
+
+  Example: Board specific pins configuration
+
+	&pinctrl {
+		/* Serial Console */
+		scif4_pins: serial4 {
+			pinmux = <RZA2_PINMUX(P9, 0, 4)>,	/* TxD4 */
+				 <RZA2_PINMUX(P9, 1, 4)>;	/* RxD4 */
+		};
+	};
+
+  Example: Assigning a GPIO:
+
+	leds {
+		status = "okay";
+		compatible = "gpio-leds";
+
+		led0 {
+			/* P6_0 */
+			gpios = <&pinctrl RZA2_PIN_ID(P6, 0) GPIO_ACTIVE_HIGH>;
+		};
+	};
diff --git a/include/dt-bindings/pinctrl/r7s9210-pinctrl.h b/include/dt-bindings/pinctrl/r7s9210-pinctrl.h
new file mode 100644
index 000000000000..39ac74ba520b
--- /dev/null
+++ b/include/dt-bindings/pinctrl/r7s9210-pinctrl.h
@@ -0,0 +1,47 @@
+/* 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 P0 0
+#define P1 1
+#define P2 2
+#define P3 3
+#define P4 4
+#define P5 5
+#define P6 6
+#define P7 7
+#define P8 8
+#define P9 9
+#define PA 10
+#define PB 11
+#define PC 12
+#define PD 13
+#define PE 14
+#define PF 15
+#define PG 16
+#define PH 17
+/* No I */
+#define PJ 18
+#define PK 19
+#define PL 20
+#define PM 21
+
+/*
+ * Create the pin index from its bank and position numbers and store in
+ * the upper 8 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_ID(port, pin)	((port) * RZA2_PINS_PER_PORT + (pin))
+
+#endif /* __DT_BINDINGS_PINCTRL_RENESAS_RZA2_H */
-- 
2.16.1