RE: omap3 hsusb0_clk

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Peter Meerwald wrote:
> Hello,
> 
> I am wondering if an OMAP3 (say dm3730) can generate the hsusb0_clk (musb)
> for ULPI by itself? (and if so, how?)
> 
> is hsusb0_clk strictly an input depending on an external clock source?
> 
> looking at the DM3730 TRM I am not entirely sure

For MUSB, no it cannot do that. HSUSB0 is strictly ULPI output clocking mode, 
which means the transceiver provides a 60 MHz clock to the OMAP.
For the OMAP, this signal has to be an input.

For the EHCI controller on OMAP3 (hsusb1/2), it's the other way around. The clock
line is ULPI input clocking mode and the OMAP provides the 60MHz clock to the PHY.

Only a small number of transceivers can accept this input clock.

- Anand

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