[PATCH v6 5/6] ARM: dts: zte: Add D-Link DWR-932M support

[Stefan Dösinger]

This adds base DT definition for zx297520v3 and one board that consumes it.

The stock kernel does not use the armv7 timer, but it seems to work
fine. The board has other board-specific timers that would need a driver
and I see no reason to bother with them since the arm standard timer
works.

The caveat is the non-standard GIC setup needed to handle the timer's
level-low PPI. This is the responsibility of the boot loader and
documented in Documentation/arch/arm/zte/zx297520v3.rst.

Signed-off-by: Stefan Dösinger <stefandoesinger at gmail.com>

---

Changes in
v6: Squash board + timer + uart patches into one
v5: Prepend the SoC name in the device specific DTS filename.
v4:
  Declare all uarts
  Remove the UART aliases for now. I can revisit this when I get my
  hands on a board that exposes two UARTs.
---
 MAINTAINERS                                        |   1 +
 arch/arm/boot/dts/Makefile                         |   1 +
 arch/arm/boot/dts/zte/Makefile                     |   3 +
 arch/arm/boot/dts/zte/zx297520v3-dlink-dwr932m.dts |  22 +++++
 arch/arm/boot/dts/zte/zx297520v3.dtsi              | 103 +++++++++++++++++++++
 5 files changed, 130 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index e707176c2114..6f51ba1c5ada 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3775,6 +3775,7 @@ F:	drivers/video/fbdev/wmt_ge_rops.*
 ARM/ZTE ZX29 SOC SUPPORT
 M:	Stefan Dösinger <stefandoesinger at gmail.com>
 F:	Documentation/devicetree/bindings/arm/zte.yaml
+F:	arch/arm/boot/dts/zte/
 F:	arch/arm/mach-zte/
 
 ARM/ZYNQ ARCHITECTURE
diff --git a/arch/arm/boot/dts/Makefile b/arch/arm/boot/dts/Makefile
index efe38eb25301..28fba538d552 100644
--- a/arch/arm/boot/dts/Makefile
+++ b/arch/arm/boot/dts/Makefile
@@ -39,3 +39,4 @@ subdir-y += unisoc
 subdir-y += vt8500
 subdir-y += xen
 subdir-y += xilinx
+subdir-y += zte
diff --git a/arch/arm/boot/dts/zte/Makefile b/arch/arm/boot/dts/zte/Makefile
new file mode 100644
index 000000000000..f052cfbd636c
--- /dev/null
+++ b/arch/arm/boot/dts/zte/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+dtb-$(CONFIG_SOC_ZX297520V3) += \
+	zx297520v3-dlink-dwr932m.dtb
diff --git a/arch/arm/boot/dts/zte/zx297520v3-dlink-dwr932m.dts b/arch/arm/boot/dts/zte/zx297520v3-dlink-dwr932m.dts
new file mode 100644
index 000000000000..1700f46aba86
--- /dev/null
+++ b/arch/arm/boot/dts/zte/zx297520v3-dlink-dwr932m.dts
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2026 Stefan Dösinger <stefandoesinger at gmail.com>
+ */
+
+/dts-v1/;
+
+#include "zx297520v3.dtsi"
+
+/ {
+	model = "D-Link DWR-932M";
+	compatible = "dlink,dwr932m", "zte,zx297520v3";
+
+	memory at 20000000 {
+		device_type = "memory";
+		reg = <0x20000000 0x04000000>;
+	};
+};
+
+&uart1 {
+	status = "okay";
+};
diff --git a/arch/arm/boot/dts/zte/zx297520v3.dtsi b/arch/arm/boot/dts/zte/zx297520v3.dtsi
new file mode 100644
index 000000000000..ca65797ed926
--- /dev/null
+++ b/arch/arm/boot/dts/zte/zx297520v3.dtsi
@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2026 Stefan Dösinger <stefandoesinger at gmail.com>
+ */
+
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu at 0 {
+			device_type = "cpu";
+			compatible = "arm,cortex-a53";
+			reg = <0>;
+		};
+	};
+
+	/* Base bus clock and default for the UART. It will be replaced once a clock driver has
+	 * been added.
+	 */
+	uartclk: uartclk: uartclk-26000000 {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <26000000>;
+	};
+
+	timer {
+		compatible = "arm,armv7-timer";
+		interrupts = <GIC_PPI 13 IRQ_TYPE_LEVEL_LOW>,
+			     <GIC_PPI 14 IRQ_TYPE_LEVEL_LOW>,
+			     <GIC_PPI 11 IRQ_TYPE_LEVEL_LOW>,
+			     <GIC_PPI 10 IRQ_TYPE_LEVEL_LOW>;
+		clock-frequency = <26000000>;
+		interrupt-parent = <&gic>;
+		/* I don't think uboot sets CNTVOFF and the stock kernel doesn't use the
+		 * arm timer at all. Since this is a single CPU system I don't think it
+		 * really matters that the offset is random though.
+		 */
+		arm,cpu-registers-not-fw-configured;
+	};
+
+	soc {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "simple-bus";
+		interrupt-parent = <&gic>;
+		ranges;
+
+		/* The GIC has a non-standard way of configuring ints between level-low/level
+		 * high or rising edge/falling edge at 0xf2202070 and onwards. See AP_INT_MODE_BASE
+		 * and AP_PPI_MODE_REG in the ZTE kernel, although the offsets in the kernel source
+		 * seem wrong.
+		 *
+		 * Everything defaults to active-high/rising edge, but the timer is active-low. We
+		 * currently rely on the boot loader to change timer IRQs to active-low for us for
+		 * now.
+		 */
+		gic: interrupt-controller at f2000000 {
+			compatible = "arm,gic-v3";
+			interrupt-controller;
+			#interrupt-cells = <3>;
+			#address-cells = <1>;
+			#size-cells = <1>;
+			reg = <0xf2000000 0x10000>,
+			      <0xf2040000 0x20000>;
+		};
+
+		uart0: serial at 131000 {
+			compatible = "arm,primecell";
+			arm,primecell-periphid = <0x0018c011>;
+			reg = <0x00131000 0x1000>;
+			interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&uartclk>, <&uartclk>;
+			clock-names = "uartclk", "apb_pclk";
+			status = "disabled";
+		};
+
+		uart1: serial at 1408000 {
+			compatible = "arm,pl011", "arm,primecell";
+			arm,primecell-periphid = <0x0018c011>;
+			reg = <0x01408000 0x1000>;
+			interrupts = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&uartclk>, <&uartclk>;
+			clock-names = "uartclk", "apb_pclk";
+			status = "disabled";
+		};
+
+		uart2: serial at 140d000 {
+			compatible = "arm,primecell";
+			arm,primecell-periphid = <0x0018c011>;
+			reg = <0x0140d000 0x1000>;
+			interrupts = <GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&uartclk>, <&uartclk>;
+			clock-names = "uartclk", "apb_pclk";
+			status = "disabled";
+		};
+	};
+};

-- 
2.53.0