[PATCH v4 1/2] dmaengine: dw-axi-dmac: simplify PM functions and use modern macros

[Artem Shimko <a.shimko.dev@gmail.com>]

Simplify the power management code by removing redundant wrapper functions
and using modern kernel PM macros. This reduces code duplication and
improves maintainability.

The changes convert the suspend/resume functions to take device pointer
directly instead of the chip structure, allowing removal of the runtime
PM wrapper functions. The manual PM ops definition is replaced with
DEFINE_RUNTIME_DEV_PM_OPS() macro and pm_ptr() is used for the platform
driver. Probe and remove functions are updated to call PM functions with
device pointer.

Signed-off-by: Artem Shimko <a.shimko.dev@gmail.com>
---
 .../dma/dw-axi-dmac/dw-axi-dmac-platform.c    | 31 ++++++-------------
 1 file changed, 9 insertions(+), 22 deletions(-)

diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
index b23536645ff7..8b7cf3baf5d3 100644
--- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
@@ -1314,8 +1314,10 @@ static int dma_chan_resume(struct dma_chan *dchan)
 	return 0;
 }
 
-static int axi_dma_suspend(struct axi_dma_chip *chip)
+static int axi_dma_suspend(struct device *dev)
 {
+	struct axi_dma_chip *chip = dev_get_drvdata(dev);
+
 	axi_dma_irq_disable(chip);
 	axi_dma_disable(chip);
 
@@ -1325,9 +1327,10 @@ static int axi_dma_suspend(struct axi_dma_chip *chip)
 	return 0;
 }
 
-static int axi_dma_resume(struct axi_dma_chip *chip)
+static int axi_dma_resume(struct device *dev)
 {
 	int ret;
+	struct axi_dma_chip *chip = dev_get_drvdata(dev);
 
 	ret = clk_prepare_enable(chip->cfgr_clk);
 	if (ret < 0)
@@ -1343,20 +1346,6 @@ static int axi_dma_resume(struct axi_dma_chip *chip)
 	return 0;
 }
 
-static int __maybe_unused axi_dma_runtime_suspend(struct device *dev)
-{
-	struct axi_dma_chip *chip = dev_get_drvdata(dev);
-
-	return axi_dma_suspend(chip);
-}
-
-static int __maybe_unused axi_dma_runtime_resume(struct device *dev)
-{
-	struct axi_dma_chip *chip = dev_get_drvdata(dev);
-
-	return axi_dma_resume(chip);
-}
-
 static struct dma_chan *dw_axi_dma_of_xlate(struct of_phandle_args *dma_spec,
 					    struct of_dma *ofdma)
 {
@@ -1590,7 +1579,7 @@ static int dw_probe(struct platform_device *pdev)
 	 * driver to work also without Runtime PM.
 	 */
 	pm_runtime_get_noresume(chip->dev);
-	ret = axi_dma_resume(chip);
+	ret = axi_dma_resume(chip->dev);
 	if (ret < 0)
 		goto err_pm_disable;
 
@@ -1638,7 +1627,7 @@ static void dw_remove(struct platform_device *pdev)
 	axi_dma_disable(chip);
 
 	pm_runtime_disable(chip->dev);
-	axi_dma_suspend(chip);
+	axi_dma_suspend(chip->dev);
 
 	for (i = 0; i < DMAC_MAX_CHANNELS; i++)
 		if (chip->irq[i] > 0)
@@ -1653,9 +1642,7 @@ static void dw_remove(struct platform_device *pdev)
 	}
 }
 
-static const struct dev_pm_ops dw_axi_dma_pm_ops = {
-	SET_RUNTIME_PM_OPS(axi_dma_runtime_suspend, axi_dma_runtime_resume, NULL)
-};
+static DEFINE_RUNTIME_DEV_PM_OPS(dw_axi_dma_pm_ops, axi_dma_suspend, axi_dma_resume, NULL);
 
 static const struct of_device_id dw_dma_of_id_table[] = {
 	{
@@ -1680,7 +1667,7 @@ static struct platform_driver dw_driver = {
 	.driver = {
 		.name	= KBUILD_MODNAME,
 		.of_match_table = dw_dma_of_id_table,
-		.pm = &dw_axi_dma_pm_ops,
+		.pm = pm_ptr(&dw_axi_dma_pm_ops),
 	},
 };
 module_platform_driver(dw_driver);
-- 
2.43.0