USB: add USB EHCI support for MPC5121 SoC

Extends FSL EHCI platform driver glue layer to support
MPC5121 USB controllers. MPC5121 Rev 2.0 silicon EHCI
registers are in big endian format. The appropriate flags
are set using the information in the platform data structure.
MPC83xx system interface registers are not available on
MPC512x, so the access to these registers is isolated in
MPC512x case. Furthermore the USB controller clocks
must be enabled before 512x register accesses which is
done by providing platform specific init callback.

The MPC512x internal USB PHY doesn't provide supply voltage.
For boards using different power switches allow specifying
DRVVBUS and PWR_FAULT signal polarity of the MPC5121 internal
PHY using "fsl,invert-drvvbus" and "fsl,invert-pwr-fault"
properties in the device tree USB nodes. Adds documentation
for this new device tree bindings.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 22 insertions, 0 deletions

diff --git a/Documentation/powerpc/dts-bindings/fsl/usb.txt b/Documentation/powerpc/dts-bindings/fsl/usb.txt
index b00152402694..bd5723f0b67e 100644
--- a/Documentation/powerpc/dts-bindings/fsl/usb.txt
+++ b/Documentation/powerpc/dts-bindings/fsl/usb.txt
@@ -8,6 +8,7 @@ and additions :
 Required properties :
  - compatible : Should be "fsl-usb2-mph" for multi port host USB
    controllers, or "fsl-usb2-dr" for dual role USB controllers
+   or "fsl,mpc5121-usb2-dr" for dual role USB controllers of MPC5121
  - phy_type : For multi port host USB controllers, should be one of
    "ulpi", or "serial". For dual role USB controllers, should be
    one of "ulpi", "utmi", "utmi_wide", or "serial".
@@ -33,6 +34,12 @@ Recommended properties :
  - interrupt-parent : the phandle for the interrupt controller that
    services interrupts for this device.
 
+Optional properties :
+ - fsl,invert-drvvbus : boolean; for MPC5121 USB0 only. Indicates the
+   port power polarity of internal PHY signal DRVVBUS is inverted.
+ - fsl,invert-pwr-fault : boolean; for MPC5121 USB0 only. Indicates
+   the PWR_FAULT signal polarity is inverted.
+
 Example multi port host USB controller device node :
         usb@22000 {
                 compatible = "fsl-usb2-mph";
@@ -57,3 +64,18 @@ Example dual role USB controller device node :
                 dr_mode = "otg";
                 phy = "ulpi";
         };
+
+Example dual role USB controller device node for MPC5121ADS:
+
+        usb@4000 {
+                compatible = "fsl,mpc5121-usb2-dr";
+                reg = <0x4000 0x1000>;
+                #address-cells = <1>;
+                #size-cells = <0>;
+                interrupt-parent = < &ipic >;
+                interrupts = <44 0x8>;
+                dr_mode = "otg";
+                phy_type = "utmi_wide";
+                fsl,invert-drvvbus;
+                fsl,invert-pwr-fault;
+        };