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net: phy: Add support for microchip SMI0 MDIO bus

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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>
This commit is contained in:
Andrew Lunn
2021-04-27 09:09:07 +02:00
committed by David S. Miller
parent 61df0e7bbb
commit 800fcab823
3 changed files with 17 additions and 2 deletions
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3
include/linux/mdio-bitbang.h
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@@ -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);