1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Driver for MMIO-Mapped MDIO devices. Some IPs expose internal PHYs or PCS
3  * within the MMIO-mapped area
9 #include <linux/mdio.h>
16 #include <linux/mdio/mdio-regmap.h>
18 #define DRV_NAME "mdio-regmap"
25 static int mdio_regmap_read_c22(struct mii_bus *bus, int addr, int regnum)  in mdio_regmap_read_c22()  argument
27 	struct mdio_regmap_priv *ctx = bus->priv;  in mdio_regmap_read_c22()
31 	if (ctx->valid_addr != addr)  in mdio_regmap_read_c22()
32 		return -ENODEV;  in mdio_regmap_read_c22()
34 	ret = regmap_read(ctx->regmap, regnum, &val);  in mdio_regmap_read_c22()
41 static int mdio_regmap_write_c22(struct mii_bus *bus, int addr, int regnum,  in mdio_regmap_write_c22()  argument
44 	struct mdio_regmap_priv *ctx = bus->priv;  in mdio_regmap_write_c22()
46 	if (ctx->valid_addr != addr)  in mdio_regmap_write_c22()
47 		return -ENODEV;  in mdio_regmap_write_c22()
49 	return regmap_write(ctx->regmap, regnum, val);  in mdio_regmap_write_c22()
59 	if (!config->parent)  in devm_mdio_regmap_register()
60 		return ERR_PTR(-EINVAL);  in devm_mdio_regmap_register()
62 	mii = devm_mdiobus_alloc_size(config->parent, sizeof(*mr));  in devm_mdio_regmap_register()
64 		return ERR_PTR(-ENOMEM);  in devm_mdio_regmap_register()
66 	mr = mii->priv;  in devm_mdio_regmap_register()
67 	mr->regmap = config->regmap;  in devm_mdio_regmap_register()
68 	mr->valid_addr = config->valid_addr;  in devm_mdio_regmap_register()
70 	mii->name = DRV_NAME;  in devm_mdio_regmap_register()
71 	strscpy(mii->id, config->name, MII_BUS_ID_SIZE);  in devm_mdio_regmap_register()
72 	mii->parent = config->parent;  in devm_mdio_regmap_register()
73 	mii->read = mdio_regmap_read_c22;  in devm_mdio_regmap_register()
74 	mii->write = mdio_regmap_write_c22;  in devm_mdio_regmap_register()
76 	if (config->autoscan)  in devm_mdio_regmap_register()
77 		mii->phy_mask = ~BIT(config->valid_addr);  in devm_mdio_regmap_register()
79 		mii->phy_mask = ~0;  in devm_mdio_regmap_register()
83 		dev_err(config->parent, "Cannot register MDIO bus![%s] (%d)\n", mii->id, rc);  in devm_mdio_regmap_register()
91 MODULE_DESCRIPTION("MDIO API over regmap");