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-rw-r--r--include/linux/phylink.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/phylink.h b/include/linux/phylink.h
index c187267a15b6..79876c84ae81 100644
--- a/include/linux/phylink.h
+++ b/include/linux/phylink.h
@@ -595,6 +595,14 @@ void pcs_get_state(struct phylink_pcs *pcs, unsigned int neg_mode,
* The %neg_mode argument should be tested via the phylink_mode_*() family of
* functions, or for PCS that set pcs->neg_mode true, should be tested
* against the PHYLINK_PCS_NEG_* definitions.
+ *
+ * pcs_config() will be called when configuration of the PCS is required
+ * or when the advertisement is possibly updated. It must not unnecessarily
+ * disrupt an established link.
+ *
+ * When an autonegotiation restart is required for 802.3z modes, .pcs_config()
+ * should return a positive non-zero integer (e.g. 1) to indicate to phylink
+ * to call the pcs_an_restart() method.
*/
int pcs_config(struct phylink_pcs *pcs, unsigned int neg_mode,
phy_interface_t interface, const unsigned long *advertising,