[net-next PATCH v14 08/16] net: mdio: regmap: add support for multiple valid addr

Christian Marangi
2025-04-08T09:52:25Z

Add support for multiple valid addr for mdio regmap. This can be done by
defining the new valid_addr_mask value in the mdio regmap config.

This makes use of the new implementation used by C45 to encode
additional info in the regmap address to support multiple MDIO address.

To actually use this, support_encoded_addr MUST be enabled and
(indirectly) devm_mdio_regmap_init must be used to create the regmap.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
drivers/net/mdio/mdio-regmap.c | 8 +++++++-
include/linux/mdio/mdio-regmap.h | 1 +
2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/mdio/mdio-regmap.c b/drivers/net/mdio/mdio-regmap.c
index f263e4ae2477..ed0443eb039f 100644
--- a/drivers/net/mdio/mdio-regmap.c
+++ b/drivers/net/mdio/mdio-regmap.c
@@ -113,13 +113,19 @@ struct mii_bus *devm_mdio_regmap_register(struct device *dev,
if (!config->parent)
return ERR_PTR(-EINVAL);

+ if (config->valid_addr_mask && !config->support_encoded_addr) {
+ dev_err(dev, "encoded address support is required to support multiple MDIO address\n");
+ return ERR_PTR(-EINVAL);
+ }
+
mii = devm_mdiobus_alloc_size(config->parent, sizeof(*mr));
if (!mii)
return ERR_PTR(-ENOMEM);

mr = mii->priv;
mr->regmap = config->regmap;
- mr->valid_addr_mask = BIT(config->valid_addr);
+ mr->valid_addr_mask = config->valid_addr_mask ? config->valid_addr_mask :
+ BIT(config->valid_addr);
mr->encode_addr = config->support_encoded_addr;

mii->name = DRV_NAME;
diff --git a/include/linux/mdio/mdio-regmap.h b/include/linux/mdio/mdio-regmap.h
index 504fa2046043..bb0e7dc9c0dc 100644
--- a/include/linux/mdio/mdio-regmap.h
+++ b/include/linux/mdio/mdio-regmap.h
@@ -17,6 +17,7 @@ struct mdio_regmap_config {
struct regmap *regmap;
char name[MII_BUS_ID_SIZE];
u8 valid_addr;
+ u32 valid_addr_mask;
/* devm_mdio_regmap_init is required with this enabled */
bool support_encoded_addr;
bool autoscan;
--
2.48.1