Similar to the 4.9 series, I looked at xilinx-4.19 from https://github.com/Xilinx/linux-xlnx/tree/xlnx_rebase_v4.19 for possible backports to LTS kernels

These are the ones that look like they should be in the 4.19 lts tree:

d86c5a676e5b ("usb: dwc3: gadget: always try to prepare on started_list first") 60208a267208 ("mmc: sdhci-of-arasan: Do now show error message in case of deffered probe") 899ecaedd155 ("net: ethernet: cadence: fix socket buffer corruption problem") a98086e00420 ("mtd: spi-nor: add entry for mt35xu512aba flash") 2e14f94cf4bc ("microblaze: move "... is ready" messages to arch/microblaze/Makefile") 4722a3e6b716 ("microblaze: fix multiple bugs in arch/microblaze/boot/Makefile") 81de0cd60fd4 ("can: xilinx: fix return type of ndo_start_xmit function") 6169005ceb8c ("gpio: zynq: Report gpio direction at boot") a7351807bd8b ("usb: dwc3: update stream id in depcmd") 0e03aca2659e ("dmaengine: xilinx_dma: Fix 64-bit simple CDMA transfer") a62520473f15 ("net: macb driver, check for SKBTX_HW_TSTAMP")

Whereas these are harmless but probably not helpful:

77ec669f257b ("serial: uartps: Do not initialize field to zero again") ea42d7a67a9e ("tty: serial: uartlite: Enable clocks at probe") 415b43bdb008 ("tty: serial: uartlite: Move uart register to probe") 5f6825d1cef7 ("tty: serial: uartlite: remove console_init") deeb33e8fdd8 ("tty: serial: uartlite: Use dynamic array for console port") 95bf69a22d97 ("dt-bindings: firmware: Add bindings for ZynqMP firmware") 0005aad09453 ("mtd: spi-nor: add macros related to MICRON flash") 811496c9679a ("media: uvcvideo: Refactor URB descriptors") b12a084c8729 ("spi: spi-mem: add support for octal mode I/O data transfer") bafcc61d998c ("microblaze: adjust the help to the real behavior") 19d111ccce9f ("microblaze: remove the explicit removal of system.dtb") c5435adc3d29 ("dt-bindings: can: xilinx_can: add Xilinx CAN FD 2.0 bindings") eca42d4cf3c5 ("tty: xilinx_uartps: Correct return value in probe") 86df8dd14723 ("serial: uartps: Add the device_init_wakeup") 2bda2f811b36 ("mtd: spi-nor: add octal read flag for flash mt35xu512aba") 0837ae46ff00 ("mtd: m25p80: add support of octal mode I/O transfer") 9558281572e3 ("mtd: spi-nor: cadence-quadspi: write upto 8-bytes data in STIG mode") 734882a8bf98 ("spi: cadence: Correct initialisation of runtime PM") 8beb79b7ae93 ("net: macb: Check MDIO state before read/write and use timeouts") f5473d1d44e4 ("net: macb: Support clock management for tsu_clk")

And these are the ones that don't look like LTS material at all:

380583227c0c ("spi: spi-mem: Add extra sanity checks on the op param") 4e6b823867e2 ("gpiolib: export gpiochip_irq_reqres/relres()") 4b9d33c6a306 ("serial: uartps: Fix suspend functionality") 46a460f0150a ("serial: uartps: Do not use static struct uart_driver out of probe()") 14090ad1805f ("serial: uartps: Move alias reading higher in probe()") e4bbb5194ea3 ("serial: uartps: Move register to probe based on run time detection") 10a5315b47b0 ("serial: uartps: Fill struct uart_driver in probe()") 427c8ae9bebc ("serial: uartps: Change logic how console_port is setup") 024ca329bfb9 ("serial: uartps: Register own uart console and driver structures") 6ac1b91f346f ("serial: uartps: Enable automatic flow control") b1078c355d76 ("of: base: Introduce of_alias_get_alias_list() to check alias IDs") 20487a8ddf20 ("ARM: zynq: Convert to using %pOFn instead of device_node.name") eb30596eae94 ("remoteproc: add rproc_va_to_pa function") b0019ccd7e90 ("remoteproc: introduce rproc_find_carveout_by_name function") c874bf59add0 ("remoteproc: add helper function to check carveout device address") c6aed238b7a9 ("remoteproc: modify vring allocation to rely on centralized carveout allocator") c6d664fe8a7a ("media: uvcvideo: Convert decode functions to use new context structure") e829b262a678 ("media: uvcvideo: Protect queue internals with helper") 01e90464e42e ("media: uvcvideo: queue: Support asynchronous buffer handling") c14d107e7417 ("media: ov5640: Remove the clocks registers initialization") 644c2dcf2f2e ("dt-bindings: ASoC: xlnx, i2s: Document i2s bindings") 112a8900d4b0 ("ASoC: xlnx: Add i2s driver") 33f8db9a8920 ("ASoC: xlnx: enable i2s driver build") fb6a691a23ca ("dt: bindings: Document ZynqMP DDRC in Synopsys documentation") 0db9071353a0 ("can: xilinx: add can 2.0 support") 3b209d253e7f ("serial-uartlite: Do not use static struct uart_driver out of probe()") ee0a29ba574b ("serial-uartlite: fix null pointer dereference on pointer port") 32cf21ac4edd ("serial: uartps: Fix error path when alloc failed") 9fd609ff6380 ("arm64: dts: zynqmp: Use mmc@ instead sdhci@") e7abd89466df ("arm64: dts: zynqmp: Add DDRC node") ac1e507fe61d ("ARM: dts: Use mmc@ instead sdhci@") 91b438286ef2 ("dmaengine: xilinx_dma: Refactor axidma channel allocation") 4e47d24a908c ("dmaengine: xilinx_dma: Introduce helper macro for preparing dma address") b0b41af12a1b ("dt-bindings: memory: Add pl353 smc controller devicetree binding information") fee10bd22678 ("memory: pl353: Add driver for arm pl353 static memory controller") ba3e1847d647 ("net: macb: remove unnecessary code") 3f1b66be4aaa ("dt-bindings: reset: Add bindings for ZynqMP reset driver") 940c2361b56a ("dt-bindings: nvmem: Add bindings for ZynqMP nvmem driver") d4ff6c9efa2e ("dt-bindings: soc: Add ZynqMP PM bindings") 8fd27fb4cf76 ("dt-bindings: power: Add ZynqMP power domain bindings") e3e12ec09a18 ("dt-bindings: ASoC: xlnx, audio-formatter: Document audio formatter bindings") 6f6c3c36f091 ("ASoC: xlnx: add pcm formatter platform driver") 2f00f7715e62 ("dt-bindings: ASoC: xlnx, spdif: Document spdif bindings") b1d2a4cca20c ("ASoC: xlnx: add SPDIF audio driver") c284d4e31a0b ("ASoC: xlnx: parse AES audio parameters") 98719e42073f ("staging: android: ion: Add the GPL exception for syscalls") c2df3de0d07e ("gpio: zynq: properly support runtime PM for GPIO used as interrupts") 5591a3075e95 ("Documentation: add ibmvmc to toctree(index) and fix warnings") 4981b82ba2ff ("mailbox: ZynqMP IPI mailbox controller") abdd85b6ba73 ("dt-bindings: mailbox: Add Xilinx IPI Mailbox") d2920ef5d094 ("dt-bindings: spi: Add device tree binding documentation for Zynq QSPI controller") 67dca5e580f1 ("spi: spi-mem: Add support for Zynq QSPI controller") 9a80ba067a9c ("net: xilinx: emaclite: add minimal ethtool ops") fcf9782573ec ("net: xilinx: emaclite: add minimal ndo_do_ioctl hook") b1072b4f6e84 ("dt-bindings: xilinx-uartps: Add support for cts-override") 1863178b20c5 ("serial: uartps: Add support for cts-override")

Arnd