[S] Change in coreboot[master]: drivers/net/phy/m88e1512: Add a way to set output impedance manually

[Mario Scheithauer (Code Review)]

Attention is currently required from: Mario Scheithauer.

Hello build bot (Jenkins), Werner Zeh,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/73018

to look at the new patch set (#2).

Change subject: drivers/net/phy/m88e1512: Add a way to set output impedance manually
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drivers/net/phy/m88e1512: Add a way to set output impedance manually

This patch provides the functionality to set the RGMII output impedance
manually. To ensure that no race condition occurs, the driver strength
values for PMOS and NMOS should be written to the RGMII output impedance
calibration override register first and then the force bit should be
enabled with a second write to this register.

Link to the Marvell PHY 88E1512 datasheet:
https://web.archive.org/web/20230125074158/https://www.marvell.com/content/d...

Change-Id: I87fa03aa49514cdc33d2911d7f23386c8f69d95b
Signed-off-by: Mario Scheithauer 
---
M src/drivers/net/phy/m88e1512/chip.h
M src/drivers/net/phy/m88e1512/m88e1512.c
M src/drivers/net/phy/m88e1512/m88e1512.h
3 files changed, 47 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/18/73018/2