[PATCH phy-next 3/5] phy: lynx-28g: require an OF node to probe

[Vladimir Oltean <vladimir.oltean@nxp.com>]

The driver will gain support for variants in an upcoming change, and
will use of_device_get_match_data() to deduce the running variant from
the compatible string.

Currently, the driver expects the schema at phy/fsl,lynx-28g.yaml, and
OF-based consumers, but doesn't enforce this. And it is possible for
user space to force-bind the driver to a device without OF node using
the driver_override sysfs.

To avoid future surprise crashes for an unsupported configuration,
explicitly test for the presence of an OF node and fail probing if
found.

Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
Change is new.
---
 drivers/phy/freescale/phy-fsl-lynx-28g.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/freescale/phy-fsl-lynx-28g.c b/drivers/phy/freescale/phy-fsl-lynx-28g.c
index 4ec3fb7a0d69..6d0c395d20e5 100644
--- a/drivers/phy/freescale/phy-fsl-lynx-28g.c
+++ b/drivers/phy/freescale/phy-fsl-lynx-28g.c
@@ -1286,6 +1286,12 @@ static int lynx_28g_probe(struct platform_device *pdev)
 	struct device_node *dn;
 	int err;
 
+	dn = dev_of_node(dev);
+	if (!dn) {
+		dev_err(dev, "Device requires an OF node\n");
+		return -EINVAL;
+	}
+
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
@@ -1301,7 +1307,6 @@ static int lynx_28g_probe(struct platform_device *pdev)
 
 	lynx_28g_pll_read_configuration(priv);
 
-	dn = dev_of_node(dev);
 	if (of_get_child_count(dn)) {
 		struct device_node *child;
 
-- 
2.34.1