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| author |   Oleksij Rempel <o.rempel@pengutronix.de> | 2020-05-05 08:35:05 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2020-05-06 17:45:45 -0700 |
| commit | bdbdac7649fac05f88c9f7ab18121a17fb591687 (patch) | |
| tree | 2f5705f9e39fcfebcdb0f71165e465173b7413dc /include/uapi/linux/mii.h | |
| parent | Merge branch 'chcr-next' (diff) | |
| download | linux-dev-bdbdac7649fac05f88c9f7ab18121a17fb591687.tar.xz linux-dev-bdbdac7649fac05f88c9f7ab18121a17fb591687.zip | |
ethtool: provide UAPI for PHY master/slave configuration.
This UAPI is needed for BroadR-Reach 100BASE-T1 devices. Due to lack of
auto-negotiation support, we needed to be able to configure the
MASTER-SLAVE role of the port manually or from an application in user
space.
The same UAPI can be used for 1000BASE-T or MultiGBASE-T devices to
force MASTER or SLAVE role. See IEEE 802.3-2018:
22.2.4.3.7 MASTER-SLAVE control register (Register 9)
22.2.4.3.8 MASTER-SLAVE status register (Register 10)
40.5.2 MASTER-SLAVE configuration resolution
45.2.1.185.1 MASTER-SLAVE config value (1.2100.14)
45.2.7.10 MultiGBASE-T AN control 1 register (Register 7.32)
The MASTER-SLAVE role affects the clock configuration:
-------------------------------------------------------------------------------
When the PHY is configured as MASTER, the PMA Transmit function shall
source TX_TCLK from a local clock source. When configured as SLAVE, the
PMA Transmit function shall source TX_TCLK from the clock recovered from
data stream provided by MASTER.
iMX6Q KSZ9031 XXX
------\ /-----------\ /------------\
| | | | |
MAC |<----RGMII----->| PHY Slave |<------>| PHY Master |
|<--- 125 MHz ---+-<------/ | | \ |
------/ \-----------/ \------------/
^
\-TX_TCLK
-------------------------------------------------------------------------------
Since some clock or link related issues are only reproducible in a
specific MASTER-SLAVE-role, MAC and PHY configuration, it is beneficial
to provide generic (not 100BASE-T1 specific) interface to the user space
for configuration flexibility and trouble shooting.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/uapi/linux/mii.h')
| -rw-r--r-- | include/uapi/linux/mii.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/linux/mii.h b/include/uapi/linux/mii.h index 90f9b4e1ba27..39f7c44baf53 100644 --- a/include/uapi/linux/mii.h +++ b/include/uapi/linux/mii.h @@ -151,11 +151,13 @@ /* 1000BASE-T Control register */ #define ADVERTISE_1000FULL 0x0200 /* Advertise 1000BASE-T full duplex */ #define ADVERTISE_1000HALF 0x0100 /* Advertise 1000BASE-T half duplex */ +#define CTL1000_PREFER_MASTER 0x0400 /* prefer to operate as master */ #define CTL1000_AS_MASTER 0x0800 #define CTL1000_ENABLE_MASTER 0x1000 /* 1000BASE-T Status register */ #define LPA_1000MSFAIL 0x8000 /* Master/Slave resolution failure */ +#define LPA_1000MSRES 0x4000 /* Master/Slave resolution status */ #define LPA_1000LOCALRXOK 0x2000 /* Link partner local receiver status */ #define LPA_1000REMRXOK 0x1000 /* Link partner remote receiver status */ #define LPA_1000FULL 0x0800 /* Link partner 1000BASE-T full duplex */ |