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net: introduce a helper to determine whether to use in-band autoneg

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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>
This commit is contained in:
Vladimir Oltean 2021-09-29 18:04:39 +03:00 committed by Ramon Fried
parent 0783b16509
commit 2dd6acb795
2 changed files with 26 additions and 0 deletions
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12
drivers/core/of_extra.c
View file

@ -155,3 +155,15 @@ bool ofnode_phy_is_fixed_link(ofnode eth_node, ofnode *phy_node)
return true;
}
bool ofnode_eth_uses_inband_aneg(ofnode eth_node)
{
bool inband_aneg = false;
const char *managed;
managed = ofnode_read_string(eth_node, "managed");
if (managed && !strcmp(managed, "in-band-status"))
inband_aneg = true;
return inband_aneg;
}

14
include/dm/of_extra.h
View file

@ -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