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of_mdio: add new DT property 'managed' to specify the PHY management type

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Currently the PHY management type is selected by the MAC driver arbitrary.
The decision is based on the presence of the "fixed-link" node and on a
will of the driver's authors.
This caused a regression recently, when mvneta driver suddenly started
to use the in-band status for auto-negotiation on fixed links.
It appears the auto-negotiation may not work when expected by the MAC driver.
Sebastien Rannou explains:
<< Yes, I confirm that my HW does not generate an in-band status. AFAIK, it's
a PHY that aggregates 4xSGMIIs to 1xQSGMII ; the MAC side of the PHY (with
inband status) is connected to the switch through QSGMII, and in this context
we are on the media side of the PHY. >>
https://lkml.org/lkml/2015/7/10/206

This patch introduces the new string property 'managed' that allows
the user to set the management type explicitly.
The supported values are:
"auto" - default. Uses either MDIO or nothing, depending on the presence
of the fixed-link node
"in-band-status" - use in-band status

Signed-off-by: Stas Sergeev <[email protected]>

CC: Rob Herring <[email protected]>
CC: Pawel Moll <[email protected]>
CC: Mark Rutland <[email protected]>
CC: Ian Campbell <[email protected]>
CC: Kumar Gala <[email protected]>
CC: Florian Fainelli <[email protected]>
CC: Grant Likely <[email protected]>
CC: [email protected]
CC: [email protected]
CC: [email protected]
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Stas Sergeev 2015-07-20 17:49:57 -07:00 • committed by David S. Miller
commit 4cba5c2103
2 changed files with 21 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

19
drivers/of/of_mdio.c
View file

@ -266,7 +266,8 @@ EXPORT_SYMBOL(of_phy_attach);
bool of_phy_is_fixed_link(struct device_node *np)
{
struct device_node *dn;
int len;
int len, err;
const char *managed;
/* New binding */
dn = of_get_child_by_name(np, "fixed-link");
@ -275,6 +276,10 @@ bool of_phy_is_fixed_link(struct device_node *np)
return true;
}
err = of_property_read_string(np, "managed", &managed);
if (err == 0 && strcmp(managed, "auto") != 0)
return true;
/* Old binding */
if (of_get_property(np, "fixed-link", &len) &&
len == (5 * sizeof(__be32)))
@ -289,8 +294,18 @@ int of_phy_register_fixed_link(struct device_node *np)
struct fixed_phy_status status = {};
struct device_node *fixed_link_node;
const __be32 *fixed_link_prop;
int len;
int len, err;
struct phy_device *phy;
const char *managed;
err = of_property_read_string(np, "managed", &managed);
if (err == 0) {
if (strcmp(managed, "in-band-status") == 0) {
/* status is zeroed, namely its .link member */
phy = fixed_phy_register(PHY_POLL, &status, np);
return IS_ERR(phy) ? PTR_ERR(phy) : 0;
}
}
/* New binding */
fixed_link_node = of_get_child_by_name(np, "fixed-link");