[PATCH v2 1/2] arm64: dts: freescale: imx93-phyboard-nash: Add jtag overlay

[Primoz Fiser]

Add overlay to enable JTAG pins on the board's JTAG (X41) connector.

Signed-off-by: Primoz Fiser <primoz.fiser at norik.com>
---
Changes in v2:
- add suggested explanation comment

Link to v1: https://lore.kernel.org/all/20251007084028.1125185-1-primoz.fiser@norik.com/

 arch/arm64/boot/dts/freescale/Makefile        |  2 ++
 .../freescale/imx93-phyboard-nash-jtag.dtso   | 31 +++++++++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 arch/arm64/boot/dts/freescale/imx93-phyboard-nash-jtag.dtso

diff --git a/arch/arm64/boot/dts/freescale/Makefile b/arch/arm64/boot/dts/freescale/Makefile
index 34a81d34de39..33151065684f 100644
--- a/arch/arm64/boot/dts/freescale/Makefile
+++ b/arch/arm64/boot/dts/freescale/Makefile
@@ -357,10 +357,12 @@ dtb-$(CONFIG_ARCH_MXC) += imx93-kontron-bl-osm-s.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-nash.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-segin.dtb
 
+imx93-phyboard-nash-jtag-dtbs += imx93-phyboard-nash.dtb imx93-phyboard-nash-jtag.dtbo
 imx93-phyboard-nash-peb-wlbt-07-dtbs += imx93-phyboard-nash.dtb imx93-phyboard-nash-peb-wlbt-07.dtbo
 imx93-phyboard-segin-peb-eval-01-dtbs += imx93-phyboard-segin.dtb imx93-phyboard-segin-peb-eval-01.dtbo
 imx93-phyboard-segin-peb-wlbt-05-dtbs += imx93-phyboard-segin.dtb imx93-phyboard-segin-peb-wlbt-05.dtbo
 imx93-phycore-rpmsg-dtbs += imx93-phyboard-nash.dtb imx93-phyboard-segin.dtb imx93-phycore-rpmsg.dtbo
+dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-nash-jtag.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-nash-peb-wlbt-07.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-segin-peb-eval-01.dtb
 dtb-$(CONFIG_ARCH_MXC) += imx93-phyboard-segin-peb-wlbt-05.dtb
diff --git a/arch/arm64/boot/dts/freescale/imx93-phyboard-nash-jtag.dtso b/arch/arm64/boot/dts/freescale/imx93-phyboard-nash-jtag.dtso
new file mode 100644
index 000000000000..89f93dca3208
--- /dev/null
+++ b/arch/arm64/boot/dts/freescale/imx93-phyboard-nash-jtag.dtso
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (C) 2025 PHYTEC Messtechnik GmbH
+ * Author: Primoz Fiser <primoz.fiser at norik.com>
+ */
+
+#include "imx93-pinfunc.h"
+
+/dts-v1/;
+/plugin/;
+
+/*
+ * NOTE: Bind pinctrl_jtag to gpio2 so that the pinctrl settings are applied.
+ * JTAG itself has no dedicated driver, so without attaching it to an active
+ * device node (like gpio2), the pinmux configuration would not take effect.
+ */
+&gpio2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_jtag>;
+};
+
+&iomuxc {
+	pinctrl_jtag: jtaggrp {
+		fsl,pins = <
+			MX93_PAD_GPIO_IO24__JTAG_MUX_TDO	0x31e
+			MX93_PAD_GPIO_IO25__JTAG_MUX_TCK	0x31e
+			MX93_PAD_GPIO_IO26__JTAG_MUX_TDI	0x31e
+			MX93_PAD_GPIO_IO27__JTAG_MUX_TMS	0x31e
+		>;
+	};
+};
-- 
2.34.1