AM625: Unable to set registor from hardware point of view

prince diwan

Part Number: AM625

Tool/software:

Hello,

i want to set below ethernet phy registor to constant 1 (1001)
Registor Address : 0x0172

which is mention in below screenshot

For that i apply below commands

For Writtng
- phytool write eth1/0x0/0xD 0x001F
- phytool write eth1/0x0/0xE 0x0172
- phytool write eth1/0x0/0xD 0x401F
- phytool write eth1/0x0/0xE 0x0009
For Reading
- phytool write eth1/0x0/0xD 0x001F
- phytool write eth1/0x0/0xE 0x0172
- phytool write eth1/0x0/0xD 0x401F
- phytool read eth1/0x0/0xE

Using above command i will read successfully whatever i write on register address 0x0172

but enable to detect any changes on gpio pin.

9 months ago

0 Nick Saulnier 9 months ago

TI__Guru** 101970 points

Hello,

1) What document are you screenshotting there? I do not see this register in the AM62x Technical Reference Manual (TRM) or datasheet.

2) What are you trying to accomplish with this register write?

Regards,

Nick

0 prince diwan 9 months ago in reply to Nick Saulnier

Prodigy 170 points

Hi,

Sorry for the confusion. We are using DP83867IRRGZ ethernet PHY and want to access GPIO_0 of the same, but we are not able to change the GPIO_0 O/P value on the board.

Please note that when we read the register, we get the value that we wrote but it does not reflect on the board.

Please let us know if we are using the wrong command or what?

https://www.ti.com/lit/ds/symlink/dp83867ir.pdf

0 Nick Saulnier 9 months ago in reply to prince diwan

TI__Guru** 101970 points

Hello,

Ahh, got it. I am sending your thread over to the PHY team to comment on the best way to manually set PHY registers from Linux.

Regards,

Nick

0 Gerome Cacho 9 months ago in reply to Nick Saulnier

TI__Mastermind 39895 points

Hello,

These appear to be the correct registers to write to change GPIO functionality. You would expect the GPIO pin to go high. Is this functionality not showing up? What board is being used?

Sincerely,

Gerome

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AM625: Unable to set registor from hardware point of view