Merge branch 'net-dsa-initial-support-for-maxlinear-mxl862xx-switches'

Daniel Golle says:

====================
net: dsa: initial support for MaxLinear MxL862xx switches

This series adds very basic DSA support for the MaxLinear MxL86252
(5x 2500Base-T PHYs) and MxL86282 (8x 2500Base-T PHYs) switches.
In addition to the 2.5G TP ports both switches also come with two
SerDes interfaces which can be used either to connect external PHYs
or SFP cages, or as CPU port when using the switch with this DSA driver.

MxL862xx integrates a firmware running on an embedded processor (based on
Zephyr RTOS). Host interaction uses a simple netlink-like API transported
over MDIO/MMD.

This series includes only what's needed to pass traffic between user
ports and the CPU port: relayed MDIO to internal PHYs, basic port
enable/disable, and CPU-port special tagging.

The SerDes interface of the CPU port is automatically configured by the
switch after reset using a board-specific configuration stored together
with the firmware in the flash chip attached to the switch, so no action
is needed from the driver to setup the interface mode of the CPU port.

Also MAC settings of the PHY ports are automatically configured, which
means the driver works fine with phylink_mac_ops being all no-op stubs.

Multiple follow up series will bring support for setting up the other
SerDes PCS interface (ie. not used for the CPU port), bridge, VLAN, ...
offloading, and support for using an 802.1Q-based special tag instead of
the proprietary 8-byte tag.
====================

Link: https://patch.msgid.link/cover.1770433307.git.daniel@makrotopia.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

2 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index 7ad7ce48f531..5d1203b9af20 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -647,6 +647,19 @@ static inline int mdiodev_modify_changed(struct mdio_device *mdiodev,
 				      mask, set);
 }
 
+static inline int __mdiodev_c45_read(struct mdio_device *mdiodev, int devad,
+				     u16 regnum)
+{
+	return __mdiobus_c45_read(mdiodev->bus, mdiodev->addr, devad, regnum);
+}
+
+static inline int __mdiodev_c45_write(struct mdio_device *mdiodev, u32 devad,
+				      u16 regnum, u16 val)
+{
+	return __mdiobus_c45_write(mdiodev->bus, mdiodev->addr, devad, regnum,
+				   val);
+}
+
 static inline int mdiodev_c45_modify(struct mdio_device *mdiodev, int devad,
 				     u32 regnum, u16 mask, u16 set)
 {
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 656990365798..6c17446f3dcc 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -57,6 +57,7 @@ struct tc_action;
 #define DSA_TAG_PROTO_BRCM_LEGACY_FCS_VALUE	29
 #define DSA_TAG_PROTO_YT921X_VALUE		30
 #define DSA_TAG_PROTO_MXL_GSW1XX_VALUE		31
+#define DSA_TAG_PROTO_MXL862_VALUE		32
 
 enum dsa_tag_protocol {
 	DSA_TAG_PROTO_NONE		= DSA_TAG_PROTO_NONE_VALUE,
@@ -91,6 +92,7 @@ enum dsa_tag_protocol {
 	DSA_TAG_PROTO_VSC73XX_8021Q	= DSA_TAG_PROTO_VSC73XX_8021Q_VALUE,
 	DSA_TAG_PROTO_YT921X		= DSA_TAG_PROTO_YT921X_VALUE,
 	DSA_TAG_PROTO_MXL_GSW1XX	= DSA_TAG_PROTO_MXL_GSW1XX_VALUE,
+	DSA_TAG_PROTO_MXL862		= DSA_TAG_PROTO_MXL862_VALUE,
 };
 
 struct dsa_switch;