usb: host: ohci-platform: Add basic runtime PM support

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@vger.kernel.org
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Acked-by: Roger Quadros <rogerq@ti.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c
index 6368fce43197c9bdfe80d5fd5718eedbea50e9fb..589177dca8cabb78c56f0481e7c32b05ab156789 100644 (file)
--- 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>
@@ -242,6 +243,8 @@ static int ohci_platform_probe(struct platform_device *dev)
        }
 #endif
 
+       pm_runtime_set_active(&dev->dev);
+       pm_runtime_enable(&dev->dev);
        if (pdata->power_on) {
                err = pdata->power_on(dev);
                if (err < 0)
@@ -271,6 +274,7 @@ err_power:
        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:
@@ -292,6 +296,7 @@ static int ohci_platform_remove(struct platform_device *dev)
        struct ohci_platform_priv *priv = hcd_to_ohci_priv(hcd);
        int clk, rst;
 
+       pm_runtime_get_sync(&dev->dev);
        usb_remove_hcd(hcd);
 
        if (pdata->power_off)
@@ -305,6 +310,9 @@ static int ohci_platform_remove(struct platform_device *dev)
 
        usb_put_hcd(hcd);
 
+       pm_runtime_put_sync(&dev->dev);
+       pm_runtime_disable(&dev->dev);
+
        if (pdata == &ohci_platform_defaults)
                dev->dev.platform_data = NULL;