Texas Instruments am335x also is a popular chip with upstream support (Beaglebone Black & Olinuxino am3352-som and quite a few other vendors have modules based on it.) If you want a canonical list, look in the kernel arch/arm/boot/dts source: https://git.kernel.org/cgit/linux/kernel/git/stable/linux-st...

Actually it looks like there are quite a few Allwinner devices listed (look for sun__...)