Re: [PATCH 3/5] ARM: omap3evm: enable VBUS switch for EHCI tranceiver

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Hello.

On 20-06-2012 13:14, Zumeng Chen wrote:

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;

   Empty line after declaration block wouldn't hurt...

+		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;
  }

WBR, Sergei
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