arch/risc-v: add support for capture driver on ESP32C6 and ESP32H2.

Documentation/platforms/risc-v/esp32c6/boards/esp32c6-devkitc/index.rst

@@ -99,6 +99,22 @@ You can check that the sensor is working by using the ``bmp180`` application::
     Pressure value = 91526
     Pressure value = 91525
 
+capture
+--------
+
+The capture configuration enables the capture driver and the capture example, allowing
+the user to measure duty cycle and frequency of a signal. Default pin is GPIO 18 with
+an internal pull-up resistor enabled. When connecting a 50 Hz pulse with 50% duty cycle,
+the following output is expected:
+
+nsh> cap
+cap_main: Hardware initialized. Opening the capture device: /dev/capture0
+cap_main: Number of samples: 0
+pwm duty cycle: 50 % 
+pwm frequence: 50 Hz 
+pwm duty cycle: 50 % 
+pwm frequence: 50 Hz 
+
 coremark
 --------
 

Documentation/platforms/risc-v/esp32c6/index.rst

@@ -152,7 +152,7 @@ I2S              No
 Int. Temp.       No
 LED              No
 LED_PWM          Yes
-MCPWM            No
+MCPWM            Yes (Capture)
 Pulse Counter    No
 RMT              No
 RNG              No

arch/risc-v/src/common/espressif/Kconfig

@@ -473,6 +473,14 @@ config ESP_COEX_SW_COEXIST_ENABLE
 		If only Bluetooth is used, it is recommended to disable this option to reduce binary file
 		size.
 
+config ESP_MCPWM
+	bool "Motor Control PWM (MCPWM)"
+	default n
+	depends on ESPRESSIF_ESP32C6 || ESPRESSIF_ESP32H2
+	---help---
+		Enable support for timer capture and motor control using
+		the Motor Control PWM peripheral.
+
 endmenu # Peripheral Support
 
 menu "Wi-Fi Configuration"
@@ -1273,6 +1281,70 @@ config ESPRESSIF_I2CTIMEOMS
 	default 500
 
 endmenu # I2C configuration
+menu "MCPWM Configuration"
+	depends on ESP_MCPWM
+
+config ESP_MCPWM_CAPTURE
+	bool "MCPWM Capture Submodule"
+	depends on ESP_MCPWM
+	select CAPTURE
+	default n
+	---help---
+		Enables the use of the MCPWM capture submodule.
+
+if ESP_MCPWM_CAPTURE
+
+config ESP_MCPWM_CAPTURE_CH0
+	bool "Capture Channel 0"
+	default n
+	---help---
+		Enables capture on channel 0.
+
+if ESP_MCPWM_CAPTURE_CH0
+
+config ESP_MCPWM_CAPTURE_CH0_GPIO
+	int "GPIO Pin"
+	default 18
+	---help---
+		GPIO pin assigned to capture channel 0.
+
+endif # ESP_MCPWM_CAPTURE_CH0
+
+config ESP_MCPWM_CAPTURE_CH1
+	bool "Capture Channel 1"
+	default n
+	---help---
+		Enables capture on channel 1.
+
+if ESP_MCPWM_CAPTURE_CH1
+
+config ESP_MCPWM_CAPTURE_CH1_GPIO
+	int "GPIO Pin"
+	default 19
+	---help---
+		GPIO pin assigned to capture channel 1.
+
+endif # ESP_MCPWM_CAPTURE_CH1
+
+config ESP_MCPWM_CAPTURE_CH2
+	bool "Capture Channel 2"
+	default n
+	---help---
+		Enables capture on channel 2.
+
+if ESP_MCPWM_CAPTURE_CH2
+
+config ESP_MCPWM_CAPTURE_CH2_GPIO
+	int "GPIO Pin"
+	default 20
+	---help---
+		GPIO pin assigned to capture channel 2.
+
+endif # ESP_MCPWM_CAPTURE_CH2
+
+endif # ESP_MCPWM_CAPTURE
+
+endmenu # MCPWM Configuration
 
 menu "High Resolution Timer"
 	depends on ESPRESSIF_HR_TIMER

arch/risc-v/src/common/espressif/Make.defs

@@ -114,6 +114,10 @@ ifeq ($(CONFIG_ESP_WIRELESS),y)
 	endif
 endif
 
+ifeq ($(CONFIG_ESP_MCPWM),y)
+	CHIP_CSRCS += esp_mcpwm.c
+endif
+
 #############################################################################
 # Espressif HAL for 3rd Party Platforms
 #############################################################################