PROCESSOR-SDK-AM57X: AM57 + DP83822 C45 supporting?

Rio Chan

Genius 14325 points

Part Number: PROCESSOR-SDK-AM57X
Other Parts Discussed in Thread: AM5728

Champs:

Customer MP their PCB by using AM5728 + DP83822.

Q1: Do we have the DTS for uboot/kernel or something to enable the Clause 45 of the IEEE802.3U?

Q2. does the TI AM5728 kernel 4.4 or 4.19 should support IEEE 802.3u C45 clause PHY configuration for DP83822.?

Q3. I found this E2E said AM57 has no support for C45? please confirm y or no.

e2e.ti.com/.../am5716-mdio-interface-support-for-802-3-clause-45

Q4. if the SOC has no support the C45, even ETH phy supports C45, to combine those 2 devices, the C45 won't work, am I right?

Please comment, thanks.

BR Rio

over 2 years ago

0 Josue Zamitiz-Ayala over 2 years ago

TI__Mastermind 25409 points

Hello Rio,

Please give me a couple of days to check with the dev team.

-Josue

0 Josue Zamitiz-Ayala over 2 years ago in reply to Josue Zamitiz-Ayala

TI__Mastermind 25409 points

Hello Rio,

Dev team got back to me pretty quick.

Q1) We do not since this is not supported on AM57 HW.

Q2) Not supported in SW either.

Q3)Confirmed.

Q4)AM57 does not have support for C45 in hardware, so CPSW/MDIO and PHY cannot communicate via C45

If the PHY supports c45, then it might be possible to access c45 registers via c22 see https://www.ieee802.org/3/efm/public/nov02/oam/pannell_oam_1_1102.pdf

Hope that helps!

-Josue

0 Rio Chan over 2 years ago in reply to Josue Zamitiz-Ayala

TI__Genius 14325 points

Hi Josue:

Thanks, I will close this.

BR Rio

0 Rio Chan over 2 years ago in reply to Rio Chan

TI__Genius 14325 points

Hi Jouse:

Customer is asking those 2 questions:

Is it possible to backport PHY core driver from TI BSP kernel v4.19 to kernel v4.4 in order to support TI DP83822?
Our PHY DP838848 and DP83867 are both support by BSP kernel v4.4 already. So there should be no effort for driver porting for AM57, is that correct?

please comment.

Thanks.

BR Rio

0 Josue Zamitiz-Ayala over 2 years ago in reply to Rio Chan

TI__Mastermind 25409 points

Rio,

Yes, this should be possible.
Effort should theoretically be minor like DT changes and minor driver changes, etc. Please keep in mind that this is legacy software so the bulk of the effort for this is on the customer. TI will be likely to accept any patches unstreamed by the customer.

-Josue

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PROCESSOR-SDK-AM57X: AM57 + DP83822 C45 supporting?