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

[Zumeng Chen]

于 2012年06月20日 20:05, Sergei Shtylyov 写道:
> 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 at windriver.com>
>> ---
>> 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...
Yes, Agreed.

Regards,
Zumeng
>
>> + 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