[PATCH v2 0/2] ethtool: implement Energy Detect Powerdown support via phy-tunable

[Alexandru Ardelean <alexandru.ardelean@analog.com>]

This changeset proposes a new control for PHY tunable to control Energy
Detect Power Down.

The `phy_tunable_id` has been named `ETHTOOL_PHY_EDPD` since it looks like
this feature is common across other PHYs (like EEE), and defining
`ETHTOOL_PHY_ENERGY_DETECT_POWER_DOWN` seems too long.
    
The way EDPD works, is that the RX block is put to a lower power mode,
except for link-pulse detection circuits. The TX block is also put to low
power mode, but the PHY wakes-up periodically to send link pulses, to avoid
lock-ups in case the other side is also in EDPD mode.
    
Currently, there are 2 PHY drivers that look like they could use this new
PHY tunable feature: the `adin` && `micrel` PHYs.

This series updates only the `adin` PHY driver to support this new feature,
as this chip has been tested. A change for `micrel` can be proposed after a
discussion of the PHY-tunable API is resolved.

Alexandru Ardelean (2):
  ethtool: implement Energy Detect Powerdown support via phy-tunable
  net: phy: adin: implement Energy Detect Powerdown mode via phy-tunable

 drivers/net/phy/adin.c       | 50 ++++++++++++++++++++++++++++++++++++
 include/uapi/linux/ethtool.h |  5 ++++
 net/core/ethtool.c           |  6 +++++
 3 files changed, 61 insertions(+)

Changelog v1 -> v2:
* initial series was made up of 2 sub-series: 1 for kernel & 1 for ethtool
  in userspace; v2 contains only the kernel series

-- 
2.20.1