linux-kernel - [PATCH v4 2/3] net: dsa: lantiq: verify compatible strings against hardware

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Date:   Mon, 22 Mar 2021 21:37:16 +0100
From:   Aleksander Jan Bajkowski <olek2@...pl>
To:     hauke@...ke-m.de, andrew@...n.ch, vivien.didelot@...il.com,
        f.fainelli@...il.com, olteanv@...il.com, davem@...emloft.net,
        kuba@...nel.org, linux@...linux.org.uk, robh+dt@...nel.org,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Aleksander Jan Bajkowski <olek2@...pl>
Subject: [PATCH v4 2/3] net: dsa: lantiq: verify compatible strings against hardware

Verify compatible string against hardware.

Signed-off-by: Aleksander Jan Bajkowski <olek2@...pl>
Acked-by: Hauke Mehrtens <hauke@...ke-m.de>
---
 drivers/net/dsa/lantiq_gswip.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/net/dsa/lantiq_gswip.c b/drivers/net/dsa/lantiq_gswip.c
index 4cab5cd26928..26d0e3bb5dea 100644
--- a/drivers/net/dsa/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq_gswip.c
@@ -1907,7 +1907,7 @@ static int gswip_gphy_fw_list(struct gswip_priv *priv,
 static int gswip_probe(struct platform_device *pdev)
 {
 	struct gswip_priv *priv;
-	struct device_node *mdio_np, *gphy_fw_np;
+	struct device_node *np, *mdio_np, *gphy_fw_np;
 	struct device *dev = &pdev->dev;
 	int err;
 	int i;
@@ -1944,6 +1944,24 @@ static int gswip_probe(struct platform_device *pdev)
 	priv->dev = dev;
 	version = gswip_switch_r(priv, GSWIP_VERSION);
 
+	np = dev->of_node;
+	switch (version) {
+	case GSWIP_VERSION_2_0:
+	case GSWIP_VERSION_2_1:
+		if (!of_device_is_compatible(np, "lantiq,xrx200-gswip"))
+			return -EINVAL;
+		break;
+	case GSWIP_VERSION_2_2:
+	case GSWIP_VERSION_2_2_ETC:
+		if (!of_device_is_compatible(np, "lantiq,xrx300-gswip") &&
+		    !of_device_is_compatible(np, "lantiq,xrx330-gswip"))
+			return -EINVAL;
+		break;
+	default:
+		dev_err(dev, "unknown GSWIP version: 0x%x", version);
+		return -ENOENT;
+	}
+
 	/* bring up the mdio bus */
 	gphy_fw_np = of_get_compatible_child(dev->of_node, "lantiq,gphy-fw");
 	if (gphy_fw_np) {
-- 
2.20.1