usb: chipidea: introduce dual role mode pdata flags

Even if a chipidea core is otg capable the board may not be. This allows
to explicitly set the core to host/peripheral mode. Without these flags
the driver falls back to the old behaviour.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 20 insertions, 7 deletions

diff --git a/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt b/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
index 184a8e0f26dc..b4b5b7906c88 100644
--- a/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
+++ b/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
@@ -9,6 +9,7 @@ Recommended properies:
 - phy_type: the type of the phy connected to the core. Should be one
   of "utmi", "utmi_wide", "ulpi", "serial" or "hsic". Without this
   property the PORTSC register won't be touched
+- dr_mode: One of "host", "peripheral" or "otg". Defaults to "otg"
 
 Optional properties:
 - fsl,usbphy: phandler of usb phy that connects to the only one port
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index a25f6b68550f..66c6c7157bb9 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -405,6 +405,7 @@ static int ci_hdrc_probe(struct platform_device *pdev)
         struct resource *res;
         void __iomem    *base;
         int             ret;
+        enum usb_dr_mode dr_mode;
 
         if (!dev->platform_data) {
                 dev_err(dev, "platform data missing\n");
@@ -456,14 +457,25 @@ static int ci_hdrc_probe(struct platform_device *pdev)
         if (!ci->platdata->phy_mode)
                 ci->platdata->phy_mode = of_usb_get_phy_mode(dev->of_node);
 
+        if (!ci->platdata->dr_mode)
+                ci->platdata->dr_mode = of_usb_get_dr_mode(dev->of_node);
+
+        if (ci->platdata->dr_mode == USB_DR_MODE_UNKNOWN)
+                ci->platdata->dr_mode = USB_DR_MODE_OTG;
+
+        dr_mode = ci->platdata->dr_mode;
         /* initialize role(s) before the interrupt is requested */
-        ret = ci_hdrc_host_init(ci);
-        if (ret)
-                dev_info(dev, "doesn't support host\n");
+        if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
+                ret = ci_hdrc_host_init(ci);
+                if (ret)
+                        dev_info(dev, "doesn't support host\n");
+        }
 
-        ret = ci_hdrc_gadget_init(ci);
-        if (ret)
-                dev_info(dev, "doesn't support gadget\n");
+        if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
+                ret = ci_hdrc_gadget_init(ci);
+                if (ret)
+                        dev_info(dev, "doesn't support gadget\n");
+        }
 
         if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
                 dev_err(dev, "no supported roles\n");
diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index 1a2aa1848804..b3146476be5c 100644
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -20,7 +20,7 @@ struct ci13xxx_platform_data {
 #define CI13XXX_REQUIRE_TRANSCEIVER     BIT(1)
 #define CI13XXX_PULLUP_ON_VBUS          BIT(2)
 #define CI13XXX_DISABLE_STREAMING       BIT(3)
-
+        enum usb_dr_mode        dr_mode;
 #define CI13XXX_CONTROLLER_RESET_EVENT          0
 #define CI13XXX_CONTROLLER_STOPPED_EVENT        1
         void    (*notify_event) (struct ci13xxx *ci, unsigned event);