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Commit cb8ca589 authored by Zumeng Chen's avatar Zumeng Chen Committed by Tony Lindgren
Browse files

ARM: omap3evm: enable VBUS switch for EHCI tranceiver 



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: default avatarZumeng Chen <zumeng.chen@windriver.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 497af1f3

arch/arm/mach-omap2/board-omap3evm.c

+11 −0
Original line number Diff line number Diff line
@@ -360,6 +360,17 @@ 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;

}