TI: k3-{am64,am65,j7200,j721e}: Add ti,min-output-impedance

[PATCH 0/4] TI: k3-{am64,am65,j7200,j721e}: Add ti,min-output-impedance

Posted by Siddharth Vadapalli 1 month, 3 weeks ago

Hello,

This series adds the "ti,min-output-impedance" device-tree property for
the DP83867 Ethernet PHY present on the following boards:
	1. AM642-SK/EVM
	2. AM654-Base-Board
	3. J7200-Common-Processor-Board
	4. J721E-Common-Processor-Board
The "ti,min-output-impedance" device-tree property is used to program
the I/O Impedance Control of the DP83867 Ethernet PHY, with the
impedance of the MAC I/O lines to/from the PHY being lowered to 35 Ohm.
The board traces are such that the default impedance of 50 Ohm results in
voltage undershoot on the MAC I/O lines resulting in CRC errors for the
Ethernet Packets.

Series is based on linux-next tagged next-20260220.

Regards,
Siddharth.

Siddharth Vadapalli (4):
  arm64: dts: ti: k3-am642-{evm,sk}: add ti,min-output-impedance
  arm64: dts: ti: k3-am654-base-board: add ti,min-output-impedance
  arm64: dts: ti: k3-j7200-common-proc-board: add
    ti,min-output-impedance
  arm64: dts: ti: k3-j721e-common-proc-board: add
    ti,min-output-impedance

 arch/arm64/boot/dts/ti/k3-am642-evm.dts               | 1 +
 arch/arm64/boot/dts/ti/k3-am642-sk.dts                | 2 ++
 arch/arm64/boot/dts/ti/k3-am654-base-board.dts        | 1 +
 arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts | 1 +
 arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts | 1 +
 5 files changed, 6 insertions(+)

-- 
2.51.1

Re: [PATCH 0/4] TI: k3-{am64,am65,j7200,j721e}: Add ti,min-output-impedance

Posted by Vignesh Raghavendra 1 month ago

Hi Siddharth Vadapalli,

On Mon, 23 Feb 2026 16:24:11 +0530, Siddharth Vadapalli wrote:
> This series adds the "ti,min-output-impedance" device-tree property for
> the DP83867 Ethernet PHY present on the following boards:
> 	1. AM642-SK/EVM
> 	2. AM654-Base-Board
> 	3. J7200-Common-Processor-Board
> 	4. J721E-Common-Processor-Board
> The "ti,min-output-impedance" device-tree property is used to program
> the I/O Impedance Control of the DP83867 Ethernet PHY, with the
> impedance of the MAC I/O lines to/from the PHY being lowered to 35 Ohm.
> The board traces are such that the default impedance of 50 Ohm results in
> voltage undershoot on the MAC I/O lines resulting in CRC errors for the
> Ethernet Packets.
> 
> [...]

I have applied the following to branch ti-k3-dts-next on [1].
Thank you!

[1/4] arm64: dts: ti: k3-am642-{evm,sk}: add ti,min-output-impedance
      commit: 2870e4deda9cd7e63ab140ad1df7904d4708f851
[2/4] arm64: dts: ti: k3-am654-base-board: add ti,min-output-impedance
      commit: 48c2db8733ea3c03e4081268a6b1031ec5e5a186
[3/4] arm64: dts: ti: k3-j7200-common-proc-board: add ti,min-output-impedance
      commit: bd24b82e1f98994519b48b2f491334a764710caf
[4/4] arm64: dts: ti: k3-j721e-common-proc-board: add ti,min-output-impedance
      commit: 6195b626bbb76415409d0eb4f5f9547cc2765ee0

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent up the chain during
the next merge window (or sooner if it is a relevant bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/ti/linux.git
--
Vignesh