[RFC PATCH] usb: host: xhci: plat: add support for otg_set_host() call

[Manish Narani]

This patch will add support for OTG host initialization. This will
help OTG drivers to populate their host subsystem.

Signed-off-by: Manish Narani <mnar...@xilinx.com>
---
 drivers/usb/host/xhci-plat.c |   35 +++++++++++++++++++++++++++++++++++
 1 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index ddfab30..b4cadbd 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -20,6 +20,10 @@
 #include <linux/slab.h>
 #include <linux/acpi.h>
 
+#ifdef CONFIG_USB_OTG
+#include <linux/usb/otg.h>
+#endif
+
 #include "xhci.h"
 #include "xhci-plat.h"
 #include "xhci-mvebu.h"
@@ -255,6 +259,24 @@ static int xhci_plat_probe(struct platform_device *pdev)
        if (ret)
                goto dealloc_usb2_hcd;
 
+#ifdef CONFIG_USB_OTG
+       hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB3);
+       if (!IS_ERR_OR_NULL(hcd->usb_phy) && hcd->usb_phy->otg) {
+               dev_dbg(&pdev->dev, "%s otg support available\n", __func__);
+               ret = otg_set_host(hcd->usb_phy->otg, &hcd->self);
+               if (ret) {
+                       dev_err(&pdev->dev, "%s otg_set_host failed\n",
+                                       __func__);
+                       usb_put_phy(hcd->usb_phy);
+                       hcd->usb_phy = NULL;
+                       goto dealloc_usb2_hcd;
+               }
+       } else {
+               usb_put_phy(hcd->usb_phy);
+               hcd->usb_phy = NULL;
+       }
+#endif
+
        return 0;
 
 
@@ -283,6 +305,19 @@ static int xhci_plat_remove(struct platform_device *dev)
        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
        struct clk *clk = xhci->clk;
 
+#ifdef CONFIG_USB_OTG
+       if (hcd->usb_phy) {
+               if (!IS_ERR(hcd->usb_phy)) {
+                       if (hcd->usb_phy->otg)
+                               otg_set_host(hcd->usb_phy->otg, NULL);
+                       usb_put_phy(hcd->usb_phy);
+               }
+               hcd->usb_phy = NULL;
+               if (xhci->shared_hcd)
+                       xhci->shared_hcd->usb_phy = NULL;
+       }
+#endif
+
        usb_remove_hcd(xhci->shared_hcd);
        usb_phy_shutdown(hcd->usb_phy);
 
-- 
1.7.1