layerscape: configure PHY reset GPIO on LS1012A-FRDM

On the LS1012A-FRDM both PHY reset pins are tied to GPIO1_23.
Up to Linux 6.6, pinctrl did not touch this GPIO and the reset
line remained in the state set by U-Boot. Starting from 6.12,
the kernel requires explicit configuration of this pin, otherwise
the PHYs fail to be detected.

This adds a gpio-hog node to ensure the reset line stays asserted,
fixing PHY detection on boot.

Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/20614
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

diff --git a/target/linux/layerscape/patches-6.12/900-layerscape-dts-ls1012a-frdm-add-GPIO-hog-for-PHY-res.patch b/target/linux/layerscape/patches-6.12/900-layerscape-dts-ls1012a-frdm-add-GPIO-hog-for-PHY-res.patch
new file mode 100644 (file)
index 0000000..99a0dec
--- /dev/null
+++ b/target/linux/layerscape/patches-6.12/900-layerscape-dts-ls1012a-frdm-add-GPIO-hog-for-PHY-res.patch
@@ -0,0 +1,36 @@
+From 3efb7aeefef62886be0dde83f6340d1a1bfcb5f6 Mon Sep 17 00:00:00 2001
+From: Pawel Dembicki <paweldembicki@gmail.com>
+Date: Fri, 31 Oct 2025 22:46:05 +0100
+Subject: [PATCH] layerscape: dts: ls1012a-frdm: add GPIO hog for PHY reset
+
+On LS1012A-FRDM both PHY reset pins are tied to GPIO1_23 (active-low).
+Older kernels preserved the U-Boot-configured level, but since 6.12 the
+pin may default to an undefined state early in boot, leaving the PHYs in
+reset and breaking detection.
+
+Add a GPIO hog on gpio1[23], configured as output-high, to keep the
+reset line deasserted from early boot.
+
+Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
+---
+ arch/arm64/boot/dts/freescale/fsl-ls1012a-frdm.dts | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+--- a/arch/arm64/boot/dts/freescale/fsl-ls1012a-frdm.dts
++++ b/arch/arm64/boot/dts/freescale/fsl-ls1012a-frdm.dts
+@@ -87,6 +87,15 @@
+       status = "okay";
+ };
+ 
++&gpio0 {
++      phy-reset-hog {
++              gpio-hog;
++              gpios = <23 1>;
++              output-low;
++              line-name = "phy-reset";
++      };
++};
++
+ &i2c0 {
+       status = "okay";
+