Merge branch 'add-support-for-j784s4-cpsw9g'

Siddharth Vadapalli says:

====================
Add support for J784S4 CPSW9G

This series adds a new compatible to am65-cpsw driver for the CPSW9G
instance of the CPSW Ethernet Switch on TI's J784S4 SoC which has 8
external ports and 1 internal host port.

The CPSW9G instance supports QSGMII and USXGMII modes for which driver
support is added.

Additionally, the interface mode specific configurations are moved to the
am65_cpsw_nuss_mac_config() callback. Also, a TODO comment is added for
verifying whether in-band mode is necessary for 10 Mbps RGMII mode.

NOTE:
I have verified that the mac_config() operations are preserved across
link up and link down events for SGMII and USXGMII mode with the new
implementation in this series, as suggested by:
Russell King <linux@armlinux.org.uk>

For patches 1 and 3 of this series, I believe that the following tag:

Suggested-by: Russell King <linux@armlinux.org.uk>
should be added. However, I did not add it since I did not yet get
the permission to do so. I will be happy if the tags are added, since
the new implementation is almost entirely based on Russell's suggestion,
with minor changes made by me.

v2:
https://lore.kernel.org/r/20230403110106.983994-1-s-vadapalli@ti.com/
v1:
https://lore.kernel.org/r/20230331065110.604516-1-s-vadapalli@ti.com/
====================

Link: https://lore.kernel.org/r/20230404061459.1100519-1-s-vadapalli@ti.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>