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Tue, 21 Apr 2026 13:23:57 -0700 (PDT) Received: from [192.168.0.2] ([197.250.227.85]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488fc0f82bbsm655989805e9.3.2026.04.21.13.23.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Apr 2026 13:23:55 -0700 (PDT) From: =?utf-8?q?Stefan_D=C3=B6singer?= Subject: [PATCH v5 0/8] Add support for ZTE zx297520v3 Date: Tue, 21 Apr 2026 23:23:08 +0300 Message-Id: <20260421-send-v5-0-ace038e63515@gmail.com> 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 X-B4-Tracking: v=1; b=H4sIAKzc52kC/13MQQrCMBCF4auUWRuZhqQYV95DuqjJ2A7YRDISl JK7G7t0+T8e3wZCmUng3G2QqbBwii3soQO/THEmxaE1aNQDmn5QQjEo6/FE6CxZ76Bdn5nu/N6 Z69h6YXml/NnVYn7rH1CMQkW9C6hvzhjyl3md+HH0aYWx1voF2KRO85gAAAA= X-Change-ID: 20260416-send-5c08e095e5c9 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 Hi, This is a follow-up on my RFC patches from January [0] for ZTE's zx297520v3 chipset. This chipset is popular in cheap LTE-to-wifi routers sold in developing countries. My goal is to run OpenWRT on them. I made more progress in more work on this SoC and it is time to get serious about code review and upstreaming. Since my version in January I managed to get more hardware running: SPI, I2C, PMIC with real time clock and voltage regulators, Watchdog. LTE is not working yet, but I am able to start the coprocessor that handles it and talk to it via mailbox + shared memory. Wifi is working on a few more devices. Since WiFi, USB and Ethernet are working, the devices can have actual use with OpenWRT even without LTE. Another hacker created a free software program to talk to the USB loader [1] and boot U-Boot and Linux without modifying the on disk files. At the moment it needs a proprietary blob, so my documentation is emphasising booting with the on-device U-Boot. This patchset here is mostly unmodified from the version I sent in January. It is the bare minimum to get an interactive shell working on the UART. Future patches can be found on my git repository [2] for those curious to peek ahead. The first 30 patches are in reasonable shape, but the further you go the more cleanup is necessary. I expect all of the patches go require a few rounds of feedback though. My plan for upstreaming is largly this: 1) This bare minimum boot patchset 2) Add clock and pinctrl drivers 3) Add standard hardware to the device tree 4) Add zx29 specific drivers one by one: Watchdog, spi, i2c, DMA, PMIC, battery 5) SDIO backend for rtl8xxxu 6) rproc, mailbox and rpmsg I am willing to maintain support for the SoC within reason. My patches add myself as maintainer. This is a hobby project for me though, keep that in mind if you want to ship a commercial product with these SoCs and upstreaming Linux. Cheers, Stefan 0: https://lists.infradead.org/pipermail/linux-arm-kernel/2026-January/1099306.html 1: https://github.com/zx297520v3-mainline/zx297520v3-loader 2: https://gitlab.com/stefandoesinger/zx297520-kernel/ Patch changelog: v5: Spelling fixes Renamed dlink-dwr-932m.dts to zx297520v3-dlink-dwr932m.dts DT binding indentation fixes Use a manufacturer 0x8b for the UART, fix patch prefix Declare all UARTs, remove uart aliases for now Consistent license declarations. I made every new file except the DT binding GPL-2.0-only but I don't particularly mind GPL-2.0-or-later either. v4: rename zx29.yaml to zte.yaml and add board enums v3: Remove [RFC] tag, add defconfig v2: checkpatch.pl fixes Signed-off-by: Stefan Dösinger --- Changes in v5: - EDITME: describe what is new in this series revision. - EDITME: use bulletpoints and terse descriptions. - Link to v4: https://lore.kernel.org/r/20260416-send-v4-0-e19d02b944ec@gmail.com --- Stefan Dösinger (8): ARM: zte: Add zx297520v3 platform support dt-bindings: arm: Add zx297520v3 board binding ARM: dts: Add D-Link DWR-932M support ARM: zte: Add support for zx29 low level debug ARM: dts: Add an armv7 timer for zx297520v3 amba/serial: amba-pl011: Bring back zx29 UART support ARM: dts: Declare UARTs on zx297520v3 boards ARM: defconfig: Add a zx29 defconfig file Documentation/arch/arm/zte/zx297520v3.rst | 158 +++++++++++++++++++++ Documentation/devicetree/bindings/arm/zte.yaml | 25 ++++ MAINTAINERS | 6 + arch/arm/Kconfig | 2 + arch/arm/Kconfig.debug | 12 ++ arch/arm/Makefile | 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 ++++++++++++++ arch/arm/configs/zx29_defconfig | 89 ++++++++++++ arch/arm/include/debug/pl01x.S | 7 + arch/arm/mach-zte/Kconfig | 26 ++++ arch/arm/mach-zte/Makefile | 2 + arch/arm/mach-zte/zx297520v3.c | 19 +++ drivers/tty/serial/amba-pl011.c | 42 ++++++ 16 files changed, 518 insertions(+) --- base-commit: 028ef9c96e96197026887c0f092424679298aae8 change-id: 20260416-send-5c08e095e5c9 Best regards, -- Stefan Dösinger