driver: dma: dma_silabs_siwx91x: Add pm device support for dma driver

This commit enables the pm device driver support
for the dma_silabs_siwx91x driver.

Signed-off-by: S Mohamed Fiaz <[email protected]>

Author: fimohame

drivers/dma/dma_silabs_siwx91x.c

@@ -13,6 +13,7 @@
 #include <zephyr/drivers/dma.h>
 #include <zephyr/drivers/clock_control.h>
 #include <zephyr/logging/log.h>
+#include <zephyr/pm/device.h>
 #include <zephyr/types.h>
 #include "rsi_rom_udma.h"
 #include "rsi_rom_udma_wrapper.h"
@@ -560,40 +561,50 @@ bool siwx91x_dma_chan_filter(const struct device *dev, int channel, void *filter
 	}
 }
 
-/* Function to initialize DMA peripheral */
-static int siwx91x_dma_init(const struct device *dev)
+static int dma_siwx91x_pm_action(const struct device *dev, enum pm_device_action action)
 {
 	const struct dma_siwx91x_config *cfg = dev->config;
 	struct dma_siwx91x_data *data = dev->data;
 	void *udma_handle = NULL;
 	UDMA_RESOURCES udma_resources = {
-		.reg = cfg->reg, /* UDMA register base address */
+		.reg = cfg->reg,
 		.udma_irq_num = cfg->irq_number,
 		.desc = cfg->sram_desc_addr,
 	};
 	int ret;
 
-	ret = clock_control_on(cfg->clock_dev, cfg->clock_subsys);
-	if (ret) {
-		return ret;
-	}
+	if (action == PM_DEVICE_ACTION_RESUME) {
+		ret = clock_control_on(cfg->clock_dev, cfg->clock_subsys);
+		if (ret) {
+			return ret;
+		}
 
-	udma_handle = UDMAx_Initialize(&udma_resources, udma_resources.desc, NULL,
-				       (uint32_t *)&data->udma_handle);
-	if (udma_handle != &data->udma_handle) {
-		return -EINVAL;
-	}
+		udma_handle = UDMAx_Initialize(&udma_resources, udma_resources.desc, NULL,
+					       (uint32_t *)&data->udma_handle);
+		if (udma_handle != &data->udma_handle) {
+			return -EINVAL;
+		}
 
-	/* Connect the DMA interrupt */
-	cfg->irq_configure();
+		cfg->irq_configure();
 
-	if (UDMAx_DMAEnable(&udma_resources, udma_handle) != 0) {
-		return -EBUSY;
+		if (UDMAx_DMAEnable(&udma_resources, udma_handle) != 0) {
+			return -EBUSY;
+		}
+	} else if (IS_ENABLED(CONFIG_PM_DEVICE) && (action == PM_DEVICE_ACTION_SUSPEND)) {
+		return 0;
+	} else {
+		return -ENOTSUP;
 	}
 
 	return 0;
 }
 
+/* Function to initialize DMA peripheral */
+static int siwx91x_dma_init(const struct device *dev)
+{
+	return pm_device_driver_init(dev, dma_siwx91x_pm_action);
+}
+
 static void siwx91x_dma_isr(const struct device *dev)
 {
 	const struct dma_siwx91x_config *cfg = dev->config;
@@ -701,7 +712,10 @@ static DEVICE_API(dma, siwx91x_dma_api) = {
 					      (siwx91x_dma_chan_desc##inst)),                      \
 		.irq_configure = siwx91x_dma_irq_configure_##inst,                                 \
 	};                                                                                         \
-	DEVICE_DT_INST_DEFINE(inst, siwx91x_dma_init, NULL, &dma_data_##inst, &dma_cfg_##inst,     \
-			      POST_KERNEL, CONFIG_DMA_INIT_PRIORITY, &siwx91x_dma_api);
+	PM_DEVICE_DT_INST_DEFINE(inst, dma_siwx91x_pm_action);                                     \
+	DEVICE_DT_INST_DEFINE(inst, siwx91x_dma_init,  PM_DEVICE_DT_INST_GET(inst),                \
+			      &dma_data_##inst, &dma_cfg_##inst, POST_KERNEL,                      \
+			      CONFIG_DMA_INIT_PRIORITY,                                           \
+			      &siwx91x_dma_api);
 
 DT_INST_FOREACH_STATUS_OKAY(SIWX91X_DMA_INIT)