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| author | Vladimir Oltean <vladimir.oltean@nxp.com> | 2021-09-29 18:04:39 +0300 |
|---|---|---|
| committer | Ramon Fried <rfried.dev@gmail.com> | 2021-11-23 10:57:55 +0300 |
| commit | 2dd6acb795962638cf57dd5e1248dd30588ae7a7 (patch) | |
| tree | 0ec113b9f911eca8971b812c2dd03dda9e2560da /include/dm | |
| parent | 0783b16509a1e6d9821084ec64f5be1cc091c7f9 (diff) | |
| download | u-boot-2dd6acb795962638cf57dd5e1248dd30588ae7a7.tar.xz | |
net: introduce a helper to determine whether to use in-band autoneg
Certain serial SERDES protocols like 1000base-x, 2500base-x, SGMII,
USXGMII can operate either in a mode where the PHY (be it on-board or
inside an SFP module) passes the link parameters (speed, duplex, pause)
to the MAC through in-band through control words standardized by IEEE
802.3 clause 37, or in a mode where the MAC must configure (force) its
link parameters based on information obtained out-of-band (MDIO reads,
guesswork etc).
In Linux, the OF node property named "managed" is parsed by the phylink
framework, and the convention is that if a driver uses phylink, then the
presence of this property means that in-band autoneg should be enabled,
otherwise it shouldn't.
To be compatible with the OF node bindings of drivers that use phylink
in Linux, introduce parsing support for this property in U-Boot too.
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Diffstat (limited to 'include/dm')
| -rw-r--r-- | include/dm/of_extra.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/dm/of_extra.h b/include/dm/of_extra.h index f0d205491c..c2498aa585 100644 --- a/include/dm/of_extra.h +++ b/include/dm/of_extra.h @@ -114,4 +114,18 @@ int ofnode_decode_memory_region(ofnode config_node, const char *mem_type, */ bool ofnode_phy_is_fixed_link(ofnode eth_node, ofnode *phy_node); +/** + * ofnode_eth_uses_inband_aneg() - Detect whether MAC should use in-band autoneg + * + * This function detects whether the Ethernet controller should use IEEE 802.3 + * clause 37 in-band autonegotiation for serial protocols such as 1000base-x, + * SGMII, USXGMII, etc. The property is relevant when the Ethernet controller + * is connected to an on-board PHY or an SFP cage, and is not relevant when it + * has a fixed link (in that case, in-band autoneg should not be used). + * + * @param eth_node ofnode belonging to the Ethernet controller + * @return true if in-band autoneg should be used, false otherwise + */ +bool ofnode_eth_uses_inband_aneg(ofnode eth_node); + #endif |