DP83822I: DP83822I LED_1 SPEED NOT WORKING - CRS STRAP MODE 2

Hi Stephen,

I see that for led_1 there is a pull down of 1.96K...so I believe the led configuration in the connector is like this..correct? :

Can you try programming register 0x0460[11:8]=0101 and see if LED glows now (this will help us isolate whether problem is with strap or led configuration).

Hi Vikram,

Yes, that is the LED configuration.

What are my options for prgramming registers within Linux?

I am running Linux on an AM3358 which is communicating with the DP83822 via MDIO and MII

Steve

Hi,

You can add these register configuration in DP83822 Phy driver initialisation routine. 

https://github.com/torvalds/linux/blob/master/drivers/net/phy/dp83822.c

Regards,

Geet

Hi Geet,

Thanks. Will forward to my software guys.

Just to be clear, the current strap configuration is correct?

Strap options alone will not configure the LED_1 active HI, programming is required?

Regards,

Steve

Hi Steve,

The strap resistor values and topologies look correct. Just to make sure that there is no other problem with strap latching/mode of phy, I asked you to configure the LED_1 through software also and see if LED glows this time.

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Regards,

Vikram