net: mdio: mdio-bcm-unimac: Refine incorrect clock message

In light of a81649a4ef ("net: mdio: mdio-bcm-unimac: Correct rate
fallback logic"), it became clear that the warning should be specific to
the MDIO controller instance, and there should be further information
provided to indicate what is wrong, whether the requested clock
frequency or the rate calculation. Clarify the message accordingly.

Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://patch.msgid.link/20250811165921.392030-1-florian.fainelli@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/mdio/mdio-bcm-unimac.c

@@ -215,7 +215,9 @@ static int unimac_mdio_clk_set(struct unimac_mdio_priv *priv)
 
 	div = (rate / (2 * priv->clk_freq)) - 1;
 	if (div & ~MDIO_CLK_DIV_MASK) {
-		pr_warn("Incorrect MDIO clock frequency, ignoring\n");
+		dev_warn(priv->mii_bus->parent,
+			 "Ignoring MDIO clock frequency request: %d vs. rate: %ld\n",
+			 priv->clk_freq, rate);
 		ret = 0;
 		goto out;
 	}