X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=board%2Fdavinci%2Fdvevm%2Fdvevm.c;h=5dd081c27532df823ee4374b14126f944428815b;hb=a9d39ebe91ecdd5ac0a0cf56ea162a19773db8da;hp=abf60b35b085a032c1a4d98c50a97ef9c5498f1f;hpb=a142896934c755e679ba87e227a8e449f39b0012;p=platform%2Fkernel%2Fu-boot.git

diff --git a/board/davinci/dvevm/dvevm.c b/board/davinci/dvevm/dvevm.c
index abf60b3..5dd081c 100644
--- a/board/davinci/dvevm/dvevm.c
+++ b/board/davinci/dvevm/dvevm.c
@@ -101,3 +101,26 @@ int misc_init_r(void)
 
 	return(0);
 }
+
+#ifdef CONFIG_USB_DAVINCI
+
+/* IO Expander I2C address and USB VBUS enable mask */
+#define IOEXP_I2C_ADDR 0x3A
+#define IOEXP_VBUSEN_MASK 1
+
+/*
+ * This function enables USB VBUS by writting to IO expander using I2C.
+ * Note that the I2C is already initialized at this stage. This
+ * function is used by davinci specific USB wrapper code.
+ */
+void enable_vbus(void)
+{
+	uchar data;  /* IO Expander data to enable VBUS */
+
+	/* Write to IO expander to enable VBUS */
+	i2c_read(IOEXP_I2C_ADDR, 0, 0, &data, 1);
+	data &= ~IOEXP_VBUSEN_MASK;
+	i2c_write(IOEXP_I2C_ADDR, 0, 0, &data, 1);
+}
+#endif
+