kernel: backport generic phylink validate

Backport generic phylink validate series and make use of it for
mtk_eth_soc Ethernet driver as well as mt7530 DSA driver.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 59 insertions, 0 deletions

diff --git a/target/linux/generic/backport-5.15/703-06-v5.18-net-dsa-add-support-for-phylink-mac_select_pcs.patch b/target/linux/generic/backport-5.15/703-06-v5.18-net-dsa-add-support-for-phylink-mac_select_pcs.patch
new file mode 100644
index 0000000000..a28d14d27a
--- /dev/null
+++ b/target/linux/generic/backport-5.15/703-06-v5.18-net-dsa-add-support-for-phylink-mac_select_pcs.patch
@@ -0,0 +1,59 @@
+From bde018222c6b084ac32933a9f933581dd83da18e Mon Sep 17 00:00:00 2001
+From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
+Date: Thu, 17 Feb 2022 18:30:35 +0000
+Subject: [PATCH] net: dsa: add support for phylink mac_select_pcs()
+
+Add DSA support for the phylink mac_select_pcs() method so DSA drivers
+can return provide phylink with the appropriate PCS for the PHY
+interface mode.
+
+Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ include/net/dsa.h |  3 +++
+ net/dsa/port.c    | 15 +++++++++++++++
+ 2 files changed, 18 insertions(+)
+
+--- a/include/net/dsa.h
++++ b/include/net/dsa.h
+@@ -631,6 +631,9 @@ struct dsa_switch_ops {
+ 	void	(*phylink_validate)(struct dsa_switch *ds, int port,
+ 				    unsigned long *supported,
+ 				    struct phylink_link_state *state);
++	struct phylink_pcs *(*phylink_mac_select_pcs)(struct dsa_switch *ds,
++						      int port,
++						      phy_interface_t iface);
+ 	int	(*phylink_mac_link_state)(struct dsa_switch *ds, int port,
+ 					  struct phylink_link_state *state);
+ 	void	(*phylink_mac_config)(struct dsa_switch *ds, int port,
+--- a/net/dsa/port.c
++++ b/net/dsa/port.c
+@@ -1012,6 +1012,20 @@ static void dsa_port_phylink_mac_pcs_get
+ 	}
+ }
+ 
++static struct phylink_pcs *
++dsa_port_phylink_mac_select_pcs(struct phylink_config *config,
++				phy_interface_t interface)
++{
++	struct dsa_port *dp = container_of(config, struct dsa_port, pl_config);
++	struct dsa_switch *ds = dp->ds;
++	struct phylink_pcs *pcs = NULL;
++
++	if (ds->ops->phylink_mac_select_pcs)
++		pcs = ds->ops->phylink_mac_select_pcs(ds, dp->index, interface);
++
++	return pcs;
++}
++
+ static void dsa_port_phylink_mac_config(struct phylink_config *config,
+ 					unsigned int mode,
+ 					const struct phylink_link_state *state)
+@@ -1078,6 +1092,7 @@ static void dsa_port_phylink_mac_link_up
+ 
+ static const struct phylink_mac_ops dsa_port_phylink_mac_ops = {
+ 	.validate = dsa_port_phylink_validate,
++	.mac_select_pcs = dsa_port_phylink_mac_select_pcs,
+ 	.mac_pcs_get_state = dsa_port_phylink_mac_pcs_get_state,
+ 	.mac_config = dsa_port_phylink_mac_config,
+ 	.mac_an_restart = dsa_port_phylink_mac_an_restart,