clk: imx: scu: add runtime pm support

Add runtime pm support

Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Sascha Hauer <kernel@pengutronix.de>
Cc: Michael Turquette <mturquette@baylibre.com>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

drivers/clk/imx/clk-scu.c

@@ -11,6 +11,7 @@
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
+#include <linux/pm_runtime.h>
 #include <linux/slab.h>
 
 #include "clk-scu.h"
@@ -453,15 +454,32 @@ static int imx_clk_scu_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct imx_scu_clk_node *clk = dev_get_platdata(dev);
 	struct clk_hw *hw;
+	int ret;
 
-	hw = __imx_clk_scu(NULL, clk->name, clk->parents, clk->num_parents,
+	pm_runtime_set_suspended(dev);
+	pm_runtime_set_autosuspend_delay(dev, 50);
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_enable(dev);
+
+	ret = pm_runtime_get_sync(dev);
+	if (ret) {
+		pm_runtime_disable(dev);
+		return ret;
+	}
+
+	hw = __imx_clk_scu(dev, clk->name, clk->parents, clk->num_parents,
 			   clk->rsrc, clk->clk_type);
-	if (IS_ERR(hw))
+	if (IS_ERR(hw)) {
+		pm_runtime_disable(dev);
 		return PTR_ERR(hw);
+	}
 
 	clk->hw = hw;
 	list_add_tail(&clk->node, &imx_scu_clks[clk->rsrc]);
 
+	pm_runtime_mark_last_busy(&pdev->dev);
+	pm_runtime_put_autosuspend(&pdev->dev);
+
 	dev_dbg(dev, "register SCU clock rsrc:%d type:%d\n", clk->rsrc,
 		clk->clk_type);