This was chosen by following the trace on the schematic from component U131
and U134 to the CPEN pin on the USB3320 device.
TWL4030.GPIO2-...->(T2_GPIO2_3V3)U131-..>nUSB2_EN-..>U134-..>EXP_nUSB2_1V8
which starts EHCI tranceiver USB3320.
This will set TWL4030.GPIO2 as output pin to drive EHCI tranceiver.
Signed-off-by: Zumeng Chen <zumeng.chen@xxxxxxxxxxxxx>
---
arch/arm/mach-omap2/board-omap3evm.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/board-omap3evm.c b/arch/arm/mach-omap2/board-omap3evm.c
index 1bfbe42..02d8047 100644
--- a/arch/arm/mach-omap2/board-omap3evm.c
+++ b/arch/arm/mach-omap2/board-omap3evm.c
@@ -360,6 +360,15 @@ static int omap3evm_twl_gpio_setup(struct device *dev,
platform_device_register(&leds_gpio);
+ /* Enable VBUS switch by setting TWL4030.GPIO2DIR as output
+ * for starting USB tranceiver
+ */
+ if (get_omap3_evm_rev() >= OMAP3EVM_BOARD_GEN_2) {
+ u8 val;
+ twl_i2c_read_u8(TWL4030_MODULE_GPIO, &val, REG_GPIODATADIR1);
+ val |= 0x04; /* TWL4030.GPIO2DIR BIT at GPIODATADIR1(0x9B) */
+ twl_i2c_write_u8(TWL4030_MODULE_GPIO, val, REG_GPIODATADIR1);
+ }
return 0;
}
--
1.7.5.4
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