upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/doc/device-tree-bindings/spi/spi-ath79.txt

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Binding for Qualcomm Atheros AR7xxx/AR9xxx SPI controller
Required properties:
- compatible: has to be "qca,<soc-type>-spi", "qca,ar7100-spi" as fallback.
- reg: Base address and size of the controllers memory area
- #address-cells: <1>, as required by generic SPI binding.
- #size-cells: <0>, also as required by generic SPI binding.
Child nodes as per the generic SPI binding.
Example:
spi@1f000000 {
compatible = "qca,ar9132-spi", "qca,ar7100-spi";
reg = <0x1f000000 0x10>;
#address-cells = <1>;
#size-cells = <0>;
};