[PATCH v2 1/7] phy: sun4i-usb: Fix of_xlate() argument check

[Andre Przywara]

In its of_xlate() function, the Allwinner USB PHY driver compares the
args_count variable against the number of implemented USB PHYs, although
this is the *number of arguments* to the DT phandle property. Per the DT
binding for this PHY device, this number is always one, so this check
will always fail if the particular SoC implements exactly one USB PHY.
So far this affected only the V3s (which has USB support disabled), but
the F1C100s also sports one PHY only.

Fix that check to compare args_count against exactly 1, and the args[0]
content (requested PHY number) against the number of implemented PHYs.

This fixes USB operation on the Allwinner V3s and allows to enable USB
on the Allwinner F1C100s SoC.

Signed-off-by: Andre Przywara <andre.przywara at arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec at gmail.com>
---
 drivers/phy/allwinner/phy-sun4i-usb.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/allwinner/phy-sun4i-usb.c b/drivers/phy/allwinner/phy-sun4i-usb.c
index 6428163c188..dbea70f9a5e 100644
--- a/drivers/phy/allwinner/phy-sun4i-usb.c
+++ b/drivers/phy/allwinner/phy-sun4i-usb.c
@@ -372,7 +372,10 @@ static int sun4i_usb_phy_xlate(struct phy *phy,
 {
 	struct sun4i_usb_phy_data *data = dev_get_priv(phy->dev);
 
-	if (args->args_count >= data->cfg->num_phys)
+	if (args->args_count != 1)
+		return -EINVAL;
+
+	if (args->args[0] >= data->cfg->num_phys)
 		return -EINVAL;
 
 	if (data->cfg->missing_phys & BIT(args->args[0]))
-- 
2.35.8