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authorAndrew Lunn <andrew@lunn.ch>2021-04-27 09:09:07 +0200
committerDavid S. Miller <davem@davemloft.net>2021-04-27 14:13:24 -0700
commit800fcab8230f622544a12403977b5b7259a076f8 (patch)
tree51c1bd5277f0a3f604e2cdb8c6b437e22408d6f4 /include
parent61df0e7bbb90fac8c77203e0fa570804617f137d (diff)
net: phy: Add support for microchip SMI0 MDIO bus
SMI0 is a mangled version of MDIO. The main low level difference is the MDIO C22 OP code is always 0, not 0x2 or 0x1 for Read/Write. The read/write information is instead encoded in the PHY address. Extend the bit-bang code to allow the op code to be overridden, but default to normal C22 values. Add an extra compatible to the mdio-gpio driver, and when this compatible is present, set the op codes to 0. A higher level driver, sitting on top of the basic MDIO bus driver can then implement the rest of the microchip SMI0 odderties. Signed-off-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mdio-bitbang.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mdio-bitbang.h b/include/linux/mdio-bitbang.h
index aca4dc037b70..373630fe5c28 100644
--- a/include/linux/mdio-bitbang.h
+++ b/include/linux/mdio-bitbang.h
@@ -33,6 +33,9 @@ struct mdiobb_ops {
struct mdiobb_ctrl {
const struct mdiobb_ops *ops;
+ unsigned int override_op_c22;
+ u8 op_c22_read;
+ u8 op_c22_write;
};
int mdiobb_read(struct mii_bus *bus, int phy, int reg);