pm: esp32c6: Power management support

Power management support (light/deep sleep) for ESP32C6

Signed-off-by: Raffael Rostagno <raffael.rostagno@espressif.com>

drivers/clock_control/clock_control_esp32.c

@@ -42,7 +42,9 @@
 #include <soc/dport_access.h>
 #include <hal/clk_tree_ll.h>
 #include <hal/usb_serial_jtag_ll.h>
-#endif /* CONFIG_SOC_SERIES_ESP32xx */
+#include <esp_private/esp_pmu.h>
+#include <ocode_init.h>
+#endif
 
 #include <zephyr/drivers/clock_control.h>
 #include <zephyr/drivers/clock_control/esp32_clock_control.h>
@@ -658,22 +660,29 @@ static int clock_control_esp32_init(const struct device *dev)
 {
 	const struct esp32_clock_config *cfg = dev->config;
 	bool ret;
-#if !defined(CONFIG_SOC_SERIES_ESP32C6)
 	soc_reset_reason_t rst_reas;
-	rtc_config_t rtc_cfg = RTC_CONFIG_DEFAULT();
 
 	rst_reas = esp_rom_get_reset_reason(0);
+
+#if defined(CONFIG_SOC_SERIES_ESP32C6)
+	pmu_init();
+	if (rst_reas == RESET_REASON_CHIP_POWER_ON) {
+		esp_ocode_calib_init();
+	}
+#else /* CONFIG_SOC_SERIES_ESP32C6 */
+	rtc_config_t rtc_cfg = RTC_CONFIG_DEFAULT();
+
 #if !defined(CONFIG_SOC_SERIES_ESP32)
 	if (rst_reas == RESET_REASON_CHIP_POWER_ON
 #if SOC_EFUSE_HAS_EFUSE_RST_BUG
 	    || rst_reas == RESET_REASON_CORE_EFUSE_CRC
-#endif
+#endif /* SOC_EFUSE_HAS_EFUSE_RST_BUG */
 	) {
 		rtc_cfg.cali_ocode = 1;
 	}
-#endif
+#endif /* !CONFIG_SOC_SERIES_ESP32 */
 	rtc_init(rtc_cfg);
-#endif
+#endif /* CONFIG_SOC_SERIES_ESP32C6 */
 
 	ret = esp32_cpu_clock_configure(&cfg->cpu);
 	if (ret) {

dts/riscv/espressif/esp32c6/esp32c6_common.dtsi

@@ -27,10 +27,27 @@
 			compatible = "espressif,riscv";
 			riscv,isa = "rv32imac_zicsr";
 			reg = <0>;
+			cpu-power-states = <&light_sleep &deep_sleep>;
 			clock-source = <ESP32_CPU_CLK_SRC_PLL>;
 			clock-frequency = <DT_FREQ_M(160)>;
 			xtal-freq = <DT_FREQ_M(40)>;
 		};
+
+		power-states {
+			light_sleep: light_sleep {
+				compatible = "zephyr,power-state";
+				power-state-name = "standby";
+				min-residency-us = <200>;
+				exit-latency-us = <60>;
+			};
+
+			deep_sleep: deep_sleep {
+				compatible = "zephyr,power-state";
+				power-state-name = "soft-off";
+				min-residency-us = <2000>;
+				exit-latency-us = <212>;
+			};
+		};
 	};
 
 	pinctrl: pin-controller {
@@ -66,14 +83,13 @@
 			status = "okay";
 		};
 
-		rtc: rtc@600b000 {
+		rtc: rtc@600b0000 {
 			compatible = "espressif,esp32-rtc";
-			reg = <0x600B000 DT_SIZE_K(1)>;
+			reg = <0x600B0000 DT_SIZE_K(1)>;
 			fast-clk-src = <ESP32_RTC_FAST_CLK_SRC_RC_FAST>;
 			slow-clk-src = <ESP32_RTC_SLOW_CLK_SRC_RC_SLOW>;
 			#clock-cells = <1>;
 			status = "okay";
-
 		};
 
 		rtc_timer: rtc_timer@600b0c00 {

soc/espressif/esp32c6/Kconfig

@@ -14,6 +14,8 @@ config SOC_SERIES_ESP32C6
 	select RISCV_ISA_EXT_ZICSR
 	select HAS_ESPRESSIF_HAL
 	select XIP if !MCUBOOT
+	select HAS_PM
+	select HAS_POWEROFF
 
 if SOC_SERIES_ESP32C6
 

soc/espressif/esp32c6/power.c

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/pm/pm.h>
+#include <zephyr/irq.h>
+#include <esp_sleep.h>
+
+#include <zephyr/logging/log.h>
+LOG_MODULE_DECLARE(soc, CONFIG_SOC_LOG_LEVEL);
+
+/* Invoke Low Power/System Off specific Tasks */
+void pm_state_set(enum pm_state state, uint8_t substate_id)
+{
+	ARG_UNUSED(substate_id);
+
+	switch (state) {
+	case PM_STATE_STANDBY:
+		/* Nothing to do. */
+		break;
+	default:
+		LOG_DBG("Unsupported power state %u", state);
+		break;
+	}
+}
+
+/* Handle SOC specific activity after Low Power Mode Exit */
+void pm_state_exit_post_ops(enum pm_state state, uint8_t substate_id)
+{
+	ARG_UNUSED(substate_id);
+
+	switch (state) {
+	case PM_STATE_STANDBY:
+		irq_unlock(MSTATUS_IEN);
+		__asm__ volatile("wfi");
+		esp_light_sleep_start();
+		break;
+	default:
+		LOG_DBG("Unsupported power state %u", state);
+		break;
+	}
+}

soc/espressif/esp32c6/poweroff.c

@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/sys/poweroff.h>
+
+#include <esp_sleep.h>
+
+void z_sys_poweroff(void)
+{
+	/* Forces RTC domain to be always on */
+	esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_ON);
+	esp_deep_sleep_start();
+}