Hi,
On 2011-07-05 13:15, Gupta, Ajay Kumar wrote:
OMAP3EVM doesn't use TPS PHY but it has ISP1507 PHY and uses external
Vbus
And so it needs extvbus programming (musb_cfg.extvbus =1)in OTG_CTRL register. As for as I know it is not needed for boards using usb PHY on
TPS
device.
Can you clarify what you mean by "not needed for boards using usb PHY on TPS device"?
This comment was more for boards such as Beagle which uses TPS device and Uses internal charge pump of PHY.
How does that differ from the ISP1507? From what I'm reading, the ISP1507 does have an integrated 5V charge pump. Or is it simply a matter of how the board is designed?
Correct. OMAP3EVM (Rev-G) doesn't use internal charge pump but external Vbus and thus we need to tell the PHY about this using BUS_CTRL.EXTVBUS Register (Sorry I wrote OTG_CTRL wrongly in previous post)
(On our custom board, we have added an external vbus supply to be able to draw > 100 mA.)
So it seems you are using PHY inside TPS659x but external Vbus for which I think you need to, 1. Explicitly set "OTG_CTRL.D5 = 0" so that PHY doesn't drive 5V. 2. Do not set musb_cfg.extvbus
I have not seen anyone with this option on TPS PHY so not sure of above Steps would work.
Thanks, Ajay
Thanks, Orjan
-- Orjan Friberg FlatFrog Laboratories AB