[PATCH 1/4] usb: host: ohci-platform: Add basic runtime PM support

[Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>]

This is needed in preparation of adding support for omap3 and
later OHCI. The runtime PM will only do something on platforms
that implement it.

Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: Hans de Goede <hdegoede-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh-zM6kxYcvzFBBDgjK7y7TUQ@public.gmane.org>
Signed-off-by: Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org>
---
 drivers/usb/host/ohci-platform.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c
--- a/drivers/usb/host/ohci-platform.c
+++ b/drivers/usb/host/ohci-platform.c
@@ -24,6 +24,7 @@
 #include <linux/err.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 #include <linux/reset.h>
 #include <linux/usb/ohci_pdriver.h>
 #include <linux/usb.h>
@@ -51,6 +52,10 @@ static int ohci_platform_power_on(struct platform_device *dev)
 	struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
 	int clk, ret, phy_num;
 
+	ret = pm_runtime_get_sync(&dev->dev);
+	if (ret < 0)
+		return ret;
+
 	for (clk = 0; clk < OHCI_MAX_CLKS && priv->clks[clk]; clk++) {
 		ret = clk_prepare_enable(priv->clks[clk]);
 		if (ret)
@@ -96,6 +101,8 @@ static void ohci_platform_power_off(struct platform_device *dev)
 	for (clk = OHCI_MAX_CLKS - 1; clk >= 0; clk--)
 		if (priv->clks[clk])
 			clk_disable_unprepare(priv->clks[clk]);
+
+	pm_runtime_put_sync(&dev->dev);
 }
 
 static struct hc_driver __read_mostly ohci_platform_hc_driver;
@@ -242,6 +249,7 @@ static int ohci_platform_probe(struct platform_device *dev)
 	}
 #endif
 
+	pm_runtime_enable(&dev->dev);
 	if (pdata->power_on) {
 		err = pdata->power_on(dev);
 		if (err < 0)
@@ -271,6 +279,7 @@ static int ohci_platform_probe(struct platform_device *dev)
 	if (pdata->power_off)
 		pdata->power_off(dev);
 err_reset:
+	pm_runtime_disable(&dev->dev);
 	while (--rst >= 0)
 		reset_control_assert(priv->resets[rst]);
 err_put_clks:
@@ -305,6 +314,8 @@ static int ohci_platform_remove(struct platform_device *dev)
 
 	usb_put_hcd(hcd);
 
+	pm_runtime_disable(&dev->dev);
+
 	if (pdata == &ohci_platform_defaults)
 		dev->dev.platform_data = NULL;
 
-- 
2.13.0
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