Other Parts Discussed in Thread: TPS2051, TPS2041B, TPS2051B
Hi,
AM3358, TPS2051BDGN and TPS2041BDGN.
Kernel 5.11.10
I have a custom board based upon the BBB. USB0 is in HOST mode and will supply +5vdc using the TPS2051BDGN power switch. During kernel boot, USB0_DRVVBUS changes from low to high and the +5 output of the TPS2051 changes from 0 to +5vdc. All has been working well until the TPS2051 ran out of stock and no one has inventory probably due to the chip shortage. There is plenty of TPS2041BDGN in stock so I ordered and installed one for testing. After installing, I found that the polarity of the pin-4 ENABLE input is inverted.
TPS2041B enable input: logic low turns on the power switch.
TPS2051B enable input: logic high turns on the power switch.
I have seen other solutions to add an inverter or tie to a GPIO line, but those would require a re-spin of my design.
What I want to do is control the polarity of the USB0_DRVVBUS output via a setting in the kernel's device tree.
Is there already a setting in the device-tree, kernel command line or user space to control the polarity of the USB0_DRVVBUS signal?
If not then where in the kernel code can the polarity be changed?
I also tried the ROHM BD82031FVJ but pin-4 EN input is also logic low turns on the power switch.
Thank you,
