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Subject[PATCH v4 0/2] ethtool: implement Energy Detect Powerdown support via phy-tunable
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

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 | 61 ++++++++++++++++++++++++++++++++++++
include/uapi/linux/ethtool.h | 22 +++++++++++++
net/core/ethtool.c | 6 ++++
3 files changed, 89 insertions(+)


Changelog v3 -> v4:
* impose the TX interval unit for EDPD to be milliseconds; the point was
raised by Michal; this should allow for intervals:
- as small as 1 millisecond, which does not sound like a power-saver
- as large as 65 seconds, which sounds like a lot to wait for a link to
come up

Changelog v2 -> v3:
* implement Andrew's review comments:
1. for patch `ethtool: implement Energy Detect Powerdown support via
- added comment in include/uapi/linux/ethtool.h
2. for patch `net: phy: adin: implement Energy Detect Powerdown mode via
- added comments about interval & units for the ADIN PHY
- in `adin_set_edpd()`: add a switch statement of all the valid values
- in `adin_get_edpd()`: return `ETHTOOL_PHY_EDPD_DFLT_TX_INTERVAL`
since the PHY only supports a single TX-interval value (1 second)

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


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