netdev - [PATCH net-next v2 1/2] net: phy: allow a PHY driver to define neither features nor get

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Date:   Wed, 3 Apr 2019 23:14:33 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        David Miller <davem@...emloft.net>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH net-next v2 1/2] net: phy: allow a PHY driver to define
 neither features nor get_features

Meanwhile we have generic functions for reading the abilities of
Clause 22 / 45 PHY's. This allows to use them as fallback in case
callback get_features isn't set. Benefit is the reduction of
boilerplate code in PHY drivers.

v2:
- adjust the comment in phy_driver_register to match the code

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/phy/phy_device.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 72fc714c9..f7a6d0ffb 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -2143,12 +2143,17 @@ static int phy_probe(struct device *dev)
 	 */
 	if (phydrv->features) {
 		linkmode_copy(phydev->supported, phydrv->features);
-	} else {
+	} else if (phydrv->get_features) {
 		err = phydrv->get_features(phydev);
-		if (err)
-			goto out;
+	} else if (phydev->is_c45) {
+		err = genphy_c45_pma_read_abilities(phydev);
+	} else {
+		err = genphy_read_abilities(phydev);
 	}
 
+	if (err)
+		goto out;
+
 	of_set_phy_supported(phydev);
 	linkmode_copy(phydev->advertising, phydev->supported);
 
@@ -2216,11 +2221,11 @@ int phy_driver_register(struct phy_driver *new_driver, struct module *owner)
 	int retval;
 
 	/* Either the features are hard coded, or dynamically
-	 * determine. It cannot be both or neither
+	 * determined. It cannot be both.
 	 */
-	if (WARN_ON((!new_driver->features && !new_driver->get_features) ||
-		    (new_driver->features && new_driver->get_features))) {
-		pr_err("%s: Driver features are missing\n", new_driver->name);
+	if (WARN_ON(new_driver->features && new_driver->get_features)) {
+		pr_err("%s: features and get_features must not both be set\n",
+		       new_driver->name);
 		return -EINVAL;
 	}
 
-- 
2.21.0