Adding USB VBUS enable functionality for DM644x DVEVM (TI DaVinci) platform.
Signed-off-by: Ravi Babu ravibabu@ti.com Signed-off-by: Swaminathan S swami.iyer@ti.com Signed-off-by: Thomas Abraham t-abraham@ti.com Signed-off-by: Ajay Kumar Gupta ajay.gupta@ti.com --- board/davinci/dvevm/dvevm.c | 23 +++++++++++++++++++++++ 1 files changed, 23 insertions(+), 0 deletions(-)
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 +