drivers: pwm: mchp: Low power mode enabled

Updated the driver with low power feature

Signed-off-by: Manimaran A <manimaran.a@microchip.com>

drivers/pwm/pwm_mchp_xec.c

@@ -19,6 +19,7 @@
 #endif
 #include <zephyr/drivers/pinctrl.h>
 #include <zephyr/logging/log.h>
+#include <zephyr/pm/device.h>
 
 #include <soc.h>
 
@@ -62,6 +63,10 @@ struct xec_params {
 	uint8_t div;
 };
 
+struct pwm_xec_data {
+	uint32_t config;
+};
+
 #define NUM_DIV_ELEMS		16
 
 static const uint32_t max_freq_high_on_div[NUM_DIV_ELEMS] = {
@@ -368,6 +373,50 @@ static int pwm_xec_get_cycles_per_sec(const struct device *dev,
 	return 0;
 }
 
+#ifdef CONFIG_PM_DEVICE
+static int pwm_xec_pm_action(const struct device *dev, enum pm_device_action action)
+{
+	const struct pwm_xec_config *const devcfg = dev->config;
+	struct pwm_regs * const regs = devcfg->regs;
+	struct pwm_xec_data * const data = dev->data;
+	int ret = 0;
+
+	switch (action) {
+	case PM_DEVICE_ACTION_RESUME:
+		ret = pinctrl_apply_state(devcfg->pcfg, PINCTRL_STATE_DEFAULT);
+		if (ret != 0) {
+			LOG_ERR("XEC PWM pinctrl setup failed (%d)", ret);
+		}
+
+		/* Turn on PWM only if it is ON before sleep */
+		if ((data->config & MCHP_PWM_CFG_ENABLE) == MCHP_PWM_CFG_ENABLE) {
+
+			regs->CONFIG |= MCHP_PWM_CFG_ENABLE;
+
+			data->config &= (~MCHP_PWM_CFG_ENABLE);
+		}
+	break;
+	case PM_DEVICE_ACTION_SUSPEND:
+		if ((regs->CONFIG & MCHP_PWM_CFG_ENABLE) == MCHP_PWM_CFG_ENABLE) {
+			/* Do copy first, then clear mode. */
+			data->config = regs->CONFIG;
+
+			regs->CONFIG &= ~(MCHP_PWM_CFG_ENABLE);
+		}
+
+		ret = pinctrl_apply_state(devcfg->pcfg, PINCTRL_STATE_SLEEP);
+		/* pinctrl-1 does not exist. */
+		if (ret == -ENOENT) {
+			ret = 0;
+		}
+	break;
+	default:
+		ret = -ENOTSUP;
+	}
+	return ret;
+}
+#endif /* CONFIG_PM_DEVICE */
+
 static const struct pwm_driver_api pwm_xec_driver_api = {
 	.set_cycles = pwm_xec_set_cycles,
 	.get_cycles_per_sec = pwm_xec_get_cycles_per_sec,
@@ -396,13 +445,17 @@ static int pwm_xec_init(const struct device *dev)
 
 #define XEC_PWM_DEVICE_INIT(index)					\
 									\
+	static struct pwm_xec_data pwm_xec_data_##index;		\
+									\
 	PINCTRL_DT_INST_DEFINE(index);					\
 									\
 	XEC_PWM_CONFIG(index);						\
 									\
+	PM_DEVICE_DT_INST_DEFINE(index, pwm_xec_pm_action);		\
+									\
 	DEVICE_DT_INST_DEFINE(index, &pwm_xec_init,			\
-			      NULL,					\
+			      PM_DEVICE_DT_INST_GET(index),		\
-			      NULL,					\
+			      &pwm_xec_data_##index,			\
 			      &pwm_xec_config_##index, POST_KERNEL,	\
 			      CONFIG_PWM_INIT_PRIORITY,			\
 			      &pwm_xec_driver_api);

dts/arm/microchip/mec152x/mec152xhsz-pinctrl.dtsi

@@ -1088,4 +1088,68 @@
 		pinmux = < MCHP_XEC_PINMUX(0155, MCHP_AF2) >;
 		low-power-enable;
 	};
+
+	/* PWM */
+	pwm0_gpio053_sleep: pwm0_gpio053_sleep {
+		pinmux = < MCHP_XEC_PINMUX(053, MCHP_AF1) >;
+	};
+
+	pwm0_alt_gpio241_sleep: pwm0_alt_gpio241_sleep {
+		pinmux = < MCHP_XEC_PINMUX(0241, MCHP_AF1) >;
+	};
+
+	pwm1_gpio054_sleep: pwm1_gpio054_sleep {
+		pinmux = < MCHP_XEC_PINMUX(054, MCHP_AF1) >;
+	};
+
+	pwm1_alt_gpio254_sleep: pwm1_alt_gpio254_sleep {
+		pinmux = < MCHP_XEC_PINMUX(0254, MCHP_AF1) >;
+	};
+
+	pwm2_gpio055_sleep: pwm2_gpio055_sleep {
+		pinmux = < MCHP_XEC_PINMUX(055, MCHP_AF1) >;
+	};
+
+	pwm2_alt_gpio045_sleep: pwm2_alt_gpio045_sleep {
+		pinmux = < MCHP_XEC_PINMUX(045, MCHP_AF2) >;
+	};
+	pwm3_gpio056_sleep: pwm3_gpio056_sleep {
+		pinmux = < MCHP_XEC_PINMUX(056, MCHP_AF1) >;
+	};
+
+	pwm3_alt_gpio047_sleep: pwm3_alt_gpio047_sleep {
+		pinmux = < MCHP_XEC_PINMUX(047, MCHP_AF2) >;
+	};
+
+	pwm4_gpio011_sleep: pwm4_gpio011_sleep {
+		pinmux = < MCHP_XEC_PINMUX(011, MCHP_AF2) >;
+	};
+
+	pwm5_gpio002_sleep: pwm5_gpio002_sleep {
+		pinmux = < MCHP_XEC_PINMUX(02, MCHP_AF1) >;
+	};
+
+	pwm6_gpio014_sleep: pwm6_gpio014_sleep {
+		pinmux = < MCHP_XEC_PINMUX(014, MCHP_AF1) >;
+	};
+
+	pwm6_alt_gpio063_sleep: pwm6_alt_gpio063_sleep {
+		pinmux = < MCHP_XEC_PINMUX(063, MCHP_AF2) >;
+	};
+
+	pwm7_gpio015_sleep: pwm7_gpio015_sleep {
+		pinmux = < MCHP_XEC_PINMUX(015, MCHP_AF1) >;
+	};
+
+	pwm7_alt_gpio061_sleep: pwm7_alt_gpio061_sleep {
+		pinmux = < MCHP_XEC_PINMUX(061, MCHP_AF2) >;
+	};
+
+	pwm8_gpio035_sleep: pwm8_gpio035_sleep {
+		pinmux = < MCHP_XEC_PINMUX(035, MCHP_AF1) >;
+	};
+
+	pwm8_alt_gpio175_sleep: pwm8_alt_gpio175_sleep {
+		pinmux = < MCHP_XEC_PINMUX(0175, MCHP_AF3) >;
+	};
 };

dts/arm/microchip/mec172x/mec172xnsz-pinctrl.dtsi

@@ -1113,4 +1113,74 @@
 		low-power-enable;
 	};
 
+	/* PWM */
+	pwm0_gpio053_sleep: pwm0_gpio053_sleep {
+		pinmux = < MCHP_XEC_PINMUX(053, MCHP_AF1) >;
+		low-power-enable;
+	};
+
+	pwm0_alt_gpio241_sleep: pwm0_alt_gpio241_sleep {
+		pinmux = < MCHP_XEC_PINMUX(0241, MCHP_AF4) >;
+		low-power-enable;
+	};
+
+	pwm1_gpio054_sleep: pwm1_gpio054_sleep {
+		pinmux = < MCHP_XEC_PINMUX(054, MCHP_AF1) >;
+		low-power-enable;
+	};
+
+	pwm2_gpio055_sleep: pwm2_gpio055_sleep {
+		pinmux = < MCHP_XEC_PINMUX(055, MCHP_AF1) >;
+		low-power-enable;
+	};
+
+	pwm2_alt_gpio045_sleep: pwm2_alt_gpio045_sleep {
+		pinmux = < MCHP_XEC_PINMUX(045, MCHP_AF2) >;
+		low-power-enable;
+	};
+
+	pwm3_gpio056_sleep: pwm3_gpio056_sleep {
+		pinmux = < MCHP_XEC_PINMUX(056, MCHP_AF1) >;
+		low-power-enable;
+	};
+
+	pwm3_alt_gpio047_sleep: pwm3_alt_gpio047_sleep {
+		pinmux = < MCHP_XEC_PINMUX(047, MCHP_AF2) >;
+		low-power-enable;
+	};
+	pwm4_gpio011_sleep: pwm4_gpio011_sleep {
+		pinmux = < MCHP_XEC_PINMUX(011, MCHP_AF2) >;
+		low-power-enable;
+	};
+
+	pwm5_gpio002_sleep: pwm5_gpio002_sleep {
+		pinmux = < MCHP_XEC_PINMUX(02, MCHP_AF1) >;
+		low-power-enable;
+	};
+
+	pwm6_gpio014_sleep: pwm6_gpio014_sleep {
+		pinmux = < MCHP_XEC_PINMUX(014, MCHP_AF1) >;
+		low-power-enable;
+	};
+
+	pwm6_alt_gpio063_sleep: pwm6_alt_gpio063_sleep {
+		pinmux = < MCHP_XEC_PINMUX(063, MCHP_AF2) >;
+		low-power-enable;
+	};
+
+	pwm7_gpio015_sleep: pwm7_gpio015_sleep {
+		pinmux = < MCHP_XEC_PINMUX(015, MCHP_AF1) >;
+		low-power-enable;
+	};
+
+	pwm8_gpio035_sleep: pwm8_gpio035_sleep {
+		pinmux = < MCHP_XEC_PINMUX(035, MCHP_AF1) >;
+		low-power-enable;
+	};
+
+	pwm8_alt_gpio175_sleep: pwm8_alt_gpio175_sleep {
+		pinmux = < MCHP_XEC_PINMUX(0175, MCHP_AF3) >;
+		low-power-enable;
+	};
+
 };