Patches which are or were in progress, or were forgot, or were not entirely upstreamable, or for whatever other reason they are usuful but did not end up in mainline:

1. Exynos chipid driver (older patchset)
2. “coupled” regulators support for Chromebook & Odroid-XU3/4: https://lkml.org/lkml/2014/4/29/28 https://lkml.org/lkml/2017/10/18/390 https://lkml.org/lkml/2017/9/18/124
3. Trats2: port sound drivers from v3.10 Tizen kernel to mainline:
   1. https://git.tizen.org/cgit/platform/kernel/linux-3.10/tree/arch/arm/boot/dts/exynos4412-trats2.dts?h=tizen#n553
   2. https://git.tizen.org/cgit/platform/kernel/linux-3.10/tree/sound/soc/samsung/trats2_wm1811.c?h=tizen
   3. person working: forkbomb
4. CPU0 hotplug is broken, to check: ARM: EXYNOS: Fix hotplug when CPUs are booted in HYP mode, ARM: EXYNOS: Fix hotplug when CPUs are booted in HYP mode (@krzk), ARM: exynos: Fix build with ARMv6 multiplatform (@krzk)
5. S5Pv210 needs hack for proper booting: [HACK] ARM: Work around bootloader bug
6. Fix Odroid HC1 thermal active->passive nodes, fix missing overrides for default trip points, check how HW behaves with real three trip points (reported by: Bartlomiej Zolnierkiewicz)
7. Extend/fix support for Exynos5260 (Rex-red, Galaxy Note 3 Neo N750)
8. ARM: EXYNOS: Update MPIDR check to accommodate A7 cores on Exynos5420

Please let us know if you pick up working on specific task to avoid duplicating efforts.