With NXP i.MX51 and Marvell 88E6352 and the referenced ethtool, I tested this functionality successfully.
Tested-by: Chris Healy <cphe...@gmail.com> On Sun, May 24, 2020 at 8:28 AM Andrew Lunn <and...@lunn.ch> wrote: > > Some ethernet PHYs allow access to raw TDR data in addition to summary > diagnostics information. Add support for retrieving this data via > netlink ethtool. The basic structure in the core is the same as for > normal phy diagnostics, the PHY driver simply uses different helpers > to fill the netlink message with different data. > > There is a graphical tool under development, as well a ethtool(1) > which can dump the data as text and JSON. > > A patched ethtool(1) can be found in > https://github.com/lunn/ethtool.git feature/cable-test-v5 > > Thanks for Chris Healy for lots of testing. > > v2: > See the individual patches but: > > Pass distances in centimeters, not meters > > Allow the PHY to round distances to what it supports and report what > it actually used along with the results. > > Make the Marvell PHY use steps a multiple of 0.805 meters, its native > step size. > > Andrew Lunn (6): > net: ethtool: Add attributes for cable test TDR data > net: ethtool: Add generic parts of cable test TDR > net: ethtool: Add helpers for cable test TDR data > net: phy: marvell: Add support for amplitude graph > net: ethtool: Allow PHY cable test TDR data to configured > net : phy: marvell: Speedup TDR data retrieval by only changing page > once > > Documentation/networking/ethtool-netlink.rst | 81 ++++++ > drivers/net/phy/marvell.c | 286 ++++++++++++++++++- > drivers/net/phy/nxp-tja11xx.c | 2 +- > drivers/net/phy/phy.c | 67 ++++- > include/linux/ethtool_netlink.h | 25 +- > include/linux/phy.h | 17 ++ > include/uapi/linux/ethtool_netlink.h | 67 +++++ > net/ethtool/cabletest.c | 209 +++++++++++++- > net/ethtool/netlink.c | 5 + > net/ethtool/netlink.h | 1 + > 10 files changed, 747 insertions(+), 13 deletions(-) > > -- > 2.27.0.rc0 >
