usb: chipidea: host: add vbus regulator control

For boards which have board level vbus control (eg, through gpio), we
need to vbus operation according to below rules:
- For host, we need open vbus before start hcd, and close it
after remove hcd.
- For otg, the vbus needs to be on/off when usb role switches.
When the host roles begins, it opens vbus; when the host role
finishes, it closes vbus.

We put vbus operation to host as host is the only vbus user,
When we are at host mode, the vbus is on, when we are not at
host mode, vbus should be off.

Tested-by: Marek Vasut <marex@denx.de>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/chipidea/host.c b/drivers/usb/chipidea/host.c
index 9b3aaf132bc373195871202ddd1f918dc4d6d648..8cf8d28c88d69aa7ddfd45a6e088dd2cae0be1a1 100644 (file)
--- a/drivers/usb/chipidea/host.c
+++ b/drivers/usb/chipidea/host.c
@@ -24,6 +24,7 @@
 #include <linux/usb.h>
 #include <linux/usb/hcd.h>
 #include <linux/usb/chipidea.h>
+#include <linux/regulator/consumer.h>
 
 #include "../host/ehci.h"
 
@@ -65,9 +66,19 @@ static int host_start(struct ci_hdrc *ci)
        ehci->has_hostpc = ci->hw_bank.lpm;
        ehci->has_tdi_phy_lpm = ci->hw_bank.lpm;
 
+       if (ci->platdata->reg_vbus) {
+               ret = regulator_enable(ci->platdata->reg_vbus);
+               if (ret) {
+                       dev_err(ci->dev,
+                               "Failed to enable vbus regulator, ret=%d\n",
+                               ret);
+                       goto put_hcd;
+               }
+       }
+
        ret = usb_add_hcd(hcd, 0, 0);
        if (ret)
-               usb_put_hcd(hcd);
+               goto disable_reg;
        else
                ci->hcd = hcd;
 
@@ -75,6 +86,14 @@ static int host_start(struct ci_hdrc *ci)
                hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
 
        return ret;
+
+disable_reg:
+       regulator_disable(ci->platdata->reg_vbus);
+
+put_hcd:
+       usb_put_hcd(hcd);
+
+       return ret;
 }
 
 static void host_stop(struct ci_hdrc *ci)
@@ -83,6 +102,8 @@ static void host_stop(struct ci_hdrc *ci)
 
        usb_remove_hcd(hcd);
        usb_put_hcd(hcd);
+       if (ci->platdata->reg_vbus)
+               regulator_disable(ci->platdata->reg_vbus);
 }
 
 int ci_hdrc_host_init(struct ci_hdrc *ci)