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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 | |
| 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>
| -rw-r--r-- | drivers/net/phy/mdio-bitbang.c | 8 | ||||
| -rw-r--r-- | drivers/net/phy/mdio-gpio.c | 8 | ||||
| -rw-r--r-- | include/linux/mdio-bitbang.h | 3 |
3 files changed, 17 insertions, 2 deletions
diff --git a/drivers/net/phy/mdio-bitbang.c b/drivers/net/phy/mdio-bitbang.c index 839a7d1eb8..656557589d 100644 --- a/drivers/net/phy/mdio-bitbang.c +++ b/drivers/net/phy/mdio-bitbang.c @@ -158,7 +158,7 @@ static int mdiobb_read(struct mii_bus *bus, int phy, int reg) reg = mdiobb_cmd_addr(ctrl, phy, reg); mdiobb_cmd(ctrl, MDIO_C45_READ, phy, reg); } else - mdiobb_cmd(ctrl, MDIO_READ, phy, reg); + mdiobb_cmd(ctrl, ctrl->op_c22_read, phy, reg); ctrl->ops->set_mdio_dir(ctrl, 0); @@ -188,7 +188,7 @@ static int mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val) reg = mdiobb_cmd_addr(ctrl, phy, reg); mdiobb_cmd(ctrl, MDIO_C45_WRITE, phy, reg); } else - mdiobb_cmd(ctrl, MDIO_WRITE, phy, reg); + mdiobb_cmd(ctrl, ctrl->op_c22_write, phy, reg); /* send the turnaround (10) */ mdiobb_send_bit(ctrl, 1); @@ -219,6 +219,10 @@ struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl) bus->write = mdiobb_write; bus->reset = mdiobb_reset; bus->priv = ctrl; + if (!ctrl->override_op_c22) { + ctrl->op_c22_read = MDIO_READ; + ctrl->op_c22_write = MDIO_WRITE; + } return bus; } diff --git a/drivers/net/phy/mdio-gpio.c b/drivers/net/phy/mdio-gpio.c index 80d2394f4b..c64f2b3925 100644 --- a/drivers/net/phy/mdio-gpio.c +++ b/drivers/net/phy/mdio-gpio.c @@ -193,6 +193,13 @@ static int mdio_gpio_probe(struct device_d *dev) goto free_mdo; } + if (np && + of_device_is_compatible(np, "microchip,mdio-smi0")) { + info->ctrl.op_c22_read = 0; + info->ctrl.op_c22_write = 0; + info->ctrl.override_op_c22 = 1; + } + bus = alloc_mdio_bitbang(&info->ctrl); bus->parent = dev; bus->dev.device_node = np; @@ -217,6 +224,7 @@ free_info: static const struct of_device_id gpio_mdio_dt_ids[] = { { .compatible = "virtual,mdio-gpio", }, + { .compatible = "microchip,mdio-smi0" }, { /* sentinel */ } }; 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. */ |