drivers: input: Add input driver support on RSK-RX130

boards/renesas/rsk_rx130/rsk_rx130.dts

@@ -86,6 +86,10 @@
 	status = "okay";
 };
 
+&ioportc {
+	status = "okay";
+};
+
 &ioportd {
 	status = "okay";
 };
@@ -118,6 +122,58 @@
 	clock-frequency = <DT_FREQ_K(400)>;
 };
 
+&ctsu {
+	pinctrl-0 = <&ctsu_default>;
+	pinctrl-names = "default";
+	max-num-sensors = <36>;
+	tscap-gpios = <&ioportc 4 0>;
+	status = "okay";
+
+	onboard_slider: touch_slider_0 {
+		component-type = "slider";
+		ssdiv = <1>;
+		so = <0x040>;
+		snum = <0x03>;
+		sdpa = <0x07>;
+		channels-num = <10>, <9>, <8>, <7>;
+		zephyr,code = <INPUT_ABS_THROTTLE>;
+		touch-count-threshold = <750>;
+
+		sld0 {
+			compatible = "renesas,rx-ctsu-slider";
+			status = "okay";
+		};
+	};
+
+	onboard_button_1: touch_button_1 {
+		component-type = "button";
+		ssdiv = <0x0>;
+		snum = <0x07>;
+		sdpa = <0x03>;
+		channels-num = <11>;
+		zephyr,code = <INPUT_KEY_1>;
+
+		button1 {
+			compatible = "renesas,rx-ctsu-button";
+			status = "okay";
+		};
+	};
+
+	onboard_button_2: touch_button_2 {
+		component-type = "button";
+		ssdiv = <0x0>;
+		snum = <0x07>;
+		sdpa = <0x03>;
+		channels-num = <12>;
+		zephyr,code = <INPUT_KEY_2>;
+
+		button2 {
+			compatible = "renesas,rx-ctsu-button";
+			status = "okay";
+		};
+	};
+};
+
 &port_irq1 {
 	status = "okay";
 };

boards/renesas/rsk_rx130/rsk_rx130_512kb-pinctrl.dtsi

@@ -41,4 +41,16 @@
 			renesas,analog-enable;
 		};
 	};
+
+	ctsu_default: ctsu_default {
+		group1 {
+			psels = <RX_PSEL(RX_PSEL_PHnPFS_TS7, 0x11, 3)>,
+				<RX_PSEL(RX_PSEL_PHnPFS_TS8, 0x11, 2)>,
+				<RX_PSEL(RX_PSEL_PHnPFS_TS9, 0x11, 1)>,
+				<RX_PSEL(RX_PSEL_PHnPFS_TS10, 0x11, 0)>,
+				<RX_PSEL(RX_PSEL_P5nPFS_TS11, 0x05, 5)>,
+				<RX_PSEL(RX_PSEL_P5nPFS_TS12, 0x05, 4)>,
+				<RX_PSEL(RX_PSEL_PCnPFS_TSCAP, 0x0c, 4)>;
+		};
+	};
 };

drivers/input/CMakeLists.txt

@@ -34,6 +34,7 @@ zephyr_library_sources_ifdef(CONFIG_INPUT_PINNACLE input_pinnacle.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_PMW3610 input_pmw3610.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_REALTEK_RTS5912_KBD input_realtek_rts5912_kbd.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_RENESAS_RA_CTSU input_renesas_ra_ctsu.c)
+zephyr_library_sources_ifdef(CONFIG_INPUT_RENESAS_RX_CTSU input_renesas_rx_ctsu.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_SBUS input_sbus.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_STM32_TSC_KEYS input_tsc_keys.c)
 zephyr_library_sources_ifdef(CONFIG_INPUT_STMPE811 input_stmpe811.c)

drivers/input/Kconfig

@@ -35,6 +35,7 @@ source "drivers/input/Kconfig.paw32xx"
 source "drivers/input/Kconfig.pinnacle"
 source "drivers/input/Kconfig.pmw3610"
 source "drivers/input/Kconfig.renesas_ra"
+source "drivers/input/Kconfig.renesas_rx"
 source "drivers/input/Kconfig.rts5912"
 source "drivers/input/Kconfig.sbus"
 source "drivers/input/Kconfig.sdl"

drivers/input/Kconfig.renesas_rx

@@ -0,0 +1,92 @@
+# Copyright (c) 2025 Renesas Electronics Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+config INPUT_RENESAS_RX_CTSU
+	bool "Renesas Capacitive Touch Sensing Unit"
+	default y
+	depends on DT_HAS_RENESAS_RX_CTSU_ENABLED
+	select USE_RX_RDP_CTSU
+	select PINCTRL
+	help
+	  Enable RX series CTSU driver
+
+if INPUT_RENESAS_RX_CTSU
+
+config INPUT_RENESAS_RX_QE_TOUCH_CFG
+	bool "Using QE Touch Workflow to config this driver"
+	help
+	  If this config was enabled, setting for CTSU and Cap
+	  Touch driver will be reflected the setting that generated
+	  from QE Touch Workflow.
+	  Please add the generated C source files into the app CMakeLists
+	  to make the driver can using it.
+
+config INPUT_RENESAS_RX_CTSU_SCAN_INTERVAL_MS
+	int "CTSU channels scan interval"
+	default 5
+	help
+	  Interval time (milliseconds) between two scans.
+
+if !INPUT_RENESAS_RX_QE_TOUCH_CFG
+
+config INPUT_RENESAS_RX_CTSU_ON_FREQ
+	int "CTSU On Frequency"
+	default 3
+	help
+	  Number of Debouncing count of touch-on filtering
+
+config INPUT_RENESAS_RX_CTSU_OFF_FREQ
+	int "CTSU Off Frequency"
+	default 3
+	help
+	  Number of Debouncing count of touch-off filtering
+
+config INPUT_RENESAS_RX_CTSU_DRIFT_FREQ
+	int "CTSU drift frequency"
+	default 255
+	help
+	  Sample count for drift correction (0 mean no use).
+
+config INPUT_RENESAS_RX_CTSU_CANCEL_FREQ
+	int "CTSU Cancel Frequency"
+	default 0
+	help
+	  Continuous Touch Cancel Count (0 mean no use).
+
+config INPUT_RENESAS_RX_CTSU_NUM_MOVING_AVERAGE
+	int "CTSU Moving average"
+	default 4
+	help
+	  Number of moving average for measurement data
+
+config INPUT_RENESAS_RX_CTSU_POWER_SUPPLY_CAPACITY
+	int "CTSU Power supply capacity"
+	default 0
+	range 0 1
+	help
+	  Power Supply Capacity Adjustment
+	  - 0: Normal (40uA)
+	  - 1: High-current output (80uA)
+
+config INPUT_RENESAS_RX_CTSU_TRANSMISSION_POWER_SUPPLY
+	int "CTSU transmission power supply"
+	default 0
+	range 0 1
+	help
+	  Transmission Power Supply Select
+	  - 0: VCC selected
+	  - 1: Internal logic power supply selected
+
+config INPUT_RENESAS_RX_CTSU_PCLK_DIVISION
+	int "CTSU: Division of PCLK"
+	default 0
+	range 0 2
+	help
+	  Division of PCLK
+	  - 0: PCLK/1
+	  - 1: PCLK/2
+	  - 2: PCLK/4
+
+endif #!INPUT_RENESAS_RX_QE_TOUCH_CFG
+
+endif #INPUT_CTSU