linux: fix bug in serdes driver breaking all SFPs of Honeycomb board

patches/linux-LSDK-21.08/0078-phy-lynx-28g-fix-probe-when-fsl-unmanaged-lanes-isn-.patch

+From 6ed01309ffc501a37084fc61f38eea95601e9c77 Mon Sep 17 00:00:00 2001
+From: Josua Mayer <josua@solid-run.com>
+Date: Sat, 25 Nov 2023 15:36:56 +0100
+Subject: [PATCH] phy: lynx-28g: fix probe when fsl,unmanaged-lanes isn't
+ specified
+
+The recently added fsl,unmanaged-lanes property is intended to be
+optional. In case of_property_read_u32 returns -EINVAL, the property
+does not exist and probe may continue.
+
+Fixes: "phy: lynx-28g: add support for specifying unmanaged lanes"
+Signed-off-by: Josua Mayer <josua@solid-run.com>
+---
+ drivers/phy/freescale/phy-fsl-lynx-28g.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/drivers/phy/freescale/phy-fsl-lynx-28g.c b/drivers/phy/freescale/phy-fsl-lynx-28g.c
+index 7e088fa4efce..b050fdf68b40 100644
+--- a/drivers/phy/freescale/phy-fsl-lynx-28g.c
++++ b/drivers/phy/freescale/phy-fsl-lynx-28g.c
+@@ -661,7 +661,7 @@ static int lynx_28g_probe(struct platform_device *pdev)
+ 	fwnode = dev_fwnode(dev);
+ 	if (fwnode && is_of_node(fwnode)) {
+ 		ret = of_property_read_u32(to_of_node(fwnode), "fsl,unmanaged-lanes", &unmanaged_lanes);
+-		if (ret) {
++		if (ret && ret != -EINVAL) {
+ 			dev_info(dev, "failed to read fsl,unmanaged-lanes property: %d\n", ret);
+ 			return ret;
+ 		}
+-- 
+2.35.3
+