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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/ Signed-off-by: Stefan Dösinger --- Changes in v8: A number of Sashiko suggestions: Add new documentation files to the documentation index Add new documentation directory to MAINTAINERS Remove a redundant "if ARCH_ZTE" Set ARM_PSCI_FW because ARM_GIC_V3 needs it Use the correct UART01x_FR_BUSY flag in lldebug asm Remove an accidentally duplicated label from the DTSI file, properly use "arm,pl011", "arm,primecell" for all UARTs Remove BINFMT_FLAT from defconfig. I have no idea how that got enabled. Point to a sane (but not yet upstream) U-Boot that sets up the GIC correctly for this board. Improve the provided example GIC setup code to detect this for reusing one binary for both boot chains. Changes in v7: Fix line order in mach-zte/Kconfig Use "zx297520v3 SoC" as the option name for CONFIG_SOC_ZX297520V3 Changes in v6: Squashed DT commits into one Removed for-now unused board DT bindings Add "zte" to DT patch subject Regenerate the defconfig with make savedefconfig - Link to v5: https://lore.kernel.org/r/20260421-send-v5-0-ace038e63515@gmail.com 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. - Link to v4: https://lore.kernel.org/r/20260416-send-v4-0-e19d02b944ec@gmail.com v4: rename zx29.yaml to zte.yaml and add board enums v3: Remove [RFC] tag, add defconfig v2: checkpatch.pl fixes --- Stefan Dösinger (6): dt-bindings: arm: zte: Add D-Link DWR932M board based on zx297520v3 SoC ARM: zte: Add zx297520v3 platform support ARM: zte: Add support for zx29 low level debug amba/serial: amba-pl011: Bring back zx29 UART support ARM: dts: zte: Add D-Link DWR-932M support ARM: zte: defconfig: Add a zx29 defconfig file Documentation/arch/arm/index.rst | 2 + Documentation/arch/arm/zte/index.rst | 10 ++ Documentation/arch/arm/zte/zx297520v3.rst | 167 +++++++++++++++++++++ Documentation/devicetree/bindings/arm/zte.yaml | 26 ++++ MAINTAINERS | 8 + 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 | 53 +++++++ arch/arm/include/debug/pl01x.S | 9 ++ arch/arm/mach-zte/Kconfig | 29 ++++ arch/arm/mach-zte/Makefile | 2 + arch/arm/mach-zte/zx297520v3.c | 16 ++ drivers/tty/serial/amba-pl011.c | 42 ++++++ 18 files changed, 508 insertions(+) --- base-commit: 028ef9c96e96197026887c0f092424679298aae8 change-id: 20260416-send-5c08e095e5c9 Best regards, -- Stefan Dösinger