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Wed, 06 May 2026 12:34:14 -0700 (PDT) From: =?utf-8?q?Stefan_D=C3=B6singer?= Date: Wed, 06 May 2026 22:33:22 +0300 Subject: [PATCH v8 5/6] ARM: dts: zte: Add D-Link DWR-932M support Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20260506-send-v8-5-f1bdf3243b34@gmail.com> References: <20260506-send-v8-0-f1bdf3243b34@gmail.com> In-Reply-To: <20260506-send-v8-0-f1bdf3243b34@gmail.com> To: Jonathan Corbet , Shuah Khan , Russell King , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Arnd Bergmann , Krzysztof Kozlowski , Alexandre Belloni , Linus Walleij , Drew Fustini , Greg Kroah-Hartman , Jiri Slaby Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, soc@lists.linux.dev, linux-serial@vger.kernel.org, =?utf-8?q?Stefan_D=C3=B6singer?= X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; 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a=openpgp; fpr=4F9C2C8728019633893EBBB98CB81F9A72BBA155 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. Reviewed-by: Linus Walleij Signed-off-by: Stefan Dösinger --- Changes in v8: Remove redundant label, use "arm,pl011" for uart0 and 2 too. 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 697287d1b372..b0b774aace55 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3776,6 +3776,7 @@ ARM/ZTE ZX29 SOC SUPPORT M: Stefan Dösinger F: Documentation/arch/arm/zte/ 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 + */ + +/dts-v1/; + +#include "zx297520v3.dtsi" + +/ { + model = "D-Link DWR-932M"; + compatible = "dlink,dwr932m", "zte,zx297520v3"; + + memory@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..a16c30a164bb --- /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 + */ + +#include + +/ { + #address-cells = <1>; + #size-cells = <1>; + + cpus { + #address-cells = <1>; + #size-cells = <0>; + + cpu@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-26000000 { + #clock-cells = <0>; + compatible = "fixed-clock"; + clock-frequency = <26000000>; + }; + + timer { + compatible = "arm,armv7-timer"; + interrupts = , + , + , + ; + 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@f2000000 { + compatible = "arm,gic-v3"; + interrupt-controller; + #interrupt-cells = <3>; + #address-cells = <1>; + #size-cells = <1>; + reg = <0xf2000000 0x10000>, + <0xf2040000 0x20000>; + }; + + uart0: serial@131000 { + compatible = "arm,pl011", "arm,primecell"; + arm,primecell-periphid = <0x0018c011>; + reg = <0x00131000 0x1000>; + interrupts = ; + clocks = <&uartclk>, <&uartclk>; + clock-names = "uartclk", "apb_pclk"; + status = "disabled"; + }; + + uart1: serial@1408000 { + compatible = "arm,pl011", "arm,primecell"; + arm,primecell-periphid = <0x0018c011>; + reg = <0x01408000 0x1000>; + interrupts = ; + clocks = <&uartclk>, <&uartclk>; + clock-names = "uartclk", "apb_pclk"; + status = "disabled"; + }; + + uart2: serial@140d000 { + compatible = "arm,pl011", "arm,primecell"; + arm,primecell-periphid = <0x0018c011>; + reg = <0x0140d000 0x1000>; + interrupts = ; + clocks = <&uartclk>, <&uartclk>; + clock-names = "uartclk", "apb_pclk"; + status = "disabled"; + }; + }; +}; -- 2.53.0