[PATCHv3 1/6] omap3: Add external VBUS power switch and overcurrent detect on IGEP v2 board.

[Enric Balletbò i Serra]

2010/10/2 David Cohen <david.cohen at nokia.com>:
> Hi,
>
> On Fri, Oct 01, 2010 at 11:09:04PM +0200, ext Enric Balletbo i Serra wrote:
>> GPIO for various devices are missing from the board initialization.
>> This patch adds support for the VBUS and over current gpios.  Without this
>> patch, input/outputs from these two sources are ignored.
>>
>> Signed-off-by: Enric Balletbo i Serra <eballetbo at gmail.com>
>> ---
>>  arch/arm/mach-omap2/board-igep0020.c |   16 ++++++++++++++++
>>  1 files changed, 16 insertions(+), 0 deletions(-)
>>
>> diff --git a/arch/arm/mach-omap2/board-igep0020.c b/arch/arm/mach-omap2/board-igep0020.c
>> index 175f043..07dbdb7 100644
>> --- a/arch/arm/mach-omap2/board-igep0020.c
>> +++ b/arch/arm/mach-omap2/board-igep0020.c
>> @@ -274,6 +274,22 @@ static int igep2_twl_gpio_setup(struct device *dev,
>>       igep2_vmmc1_supply.dev = mmc[0].dev;
>>       igep2_vmmc2_supply.dev = mmc[1].dev;
>>
>> +     /*
>> +      * REVISIT: need ehci-omap hooks for external VBUS
>> +      * power switch and overcurrent detect
>> +      */
>> +     if ((gpio_request(gpio + 1, "GPIO_EHCI_NOC") < 0) ||
>> +         (gpio_direction_input(gpio + 1) < 0))
>> +             pr_err("IGEP2: Could not obtain gpio for EHCI NOC");
>
> Shouldb't you return error if it can't request the GPIO?

I'm not sure what happens if I return and error, I see only prints a
debug message. Maybe the twl4030-gpio maintainer can explain if I need
return and error or not.

Other omap boards just don't check the gpio_request call and always
return 0. I don't consider this a critical error so maybe should be
better replace the pr_err with a pr_warning.

>
>> +
>> +     /*
>> +      * TWL4030_GPIO_MAX + 0 == ledA, GPIO_USBH_CPEN
>> +      * (out, active low)
>> +      */
>> +     if ((gpio_request(gpio + TWL4030_GPIO_MAX, "GPIO_USBH_CPEN") < 0) ||
>> +         (gpio_direction_output(gpio + TWL4030_GPIO_MAX, 0) < 0))
>> +             pr_err("IGEP2: Could not obtain gpio for USBH_CPEN");
>
> Same here.
>
>> +
>>       return 0;
>>  };
>>

Kind regards,
  Enric