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/tpm2/tis-tpm2-spi.txt

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ST33TPHF20 SPI TPMv2.0 bindings
-------------------------------
Required properties:
- compatible : Should be "tis,tpm2-spi"
- reg : SPI Chip select
Optional properties:
- gpio-reset : Reset GPIO (if not connected to the SoC reset line)
- spi-max-frequency : See spi-bus.txt
Example:
tpm@1 {
compatible = "tis,tpm2-spi";
reg = <1>;
spi-max-frequency = <10000000>;
};