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| author | Oleksij Rempel <o.rempel@pengutronix.de> | 2022-09-20 14:55:31 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2022-09-22 11:28:47 +0200 |
| commit | 5a2f0d141912524c6e39349f53519bd7f77f1e5c (patch) | |
| tree | 73bdf8a28c0da95bc79fce1073fe202592d4075f /include | |
| parent | 58eb58a9af97dde4923f2f19100f393c892a9a0a (diff) | |
| download | barebox-5a2f0d141912524c6e39349f53519bd7f77f1e5c.tar.gz barebox-5a2f0d141912524c6e39349f53519bd7f77f1e5c.tar.xz | |
net: port 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.
This code was ported from the kernel v6.0-rc2.
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Link: https://lore.barebox.org/20220920125533.2497108-1-o.rempel@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mdio-bitbang.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mdio-bitbang.h b/include/linux/mdio-bitbang.h index a6e6057886..49fe435429 100644 --- a/include/linux/mdio-bitbang.h +++ b/include/linux/mdio-bitbang.h @@ -36,6 +36,9 @@ struct mdiobb_ctrl { const struct mdiobb_ops *ops; /* reset callback */ int (*reset)(struct mii_bus *bus); + unsigned int override_op_c22; + u8 op_c22_read; + u8 op_c22_write; }; /* The returned bus is not yet registered with the phy layer. */ |