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+
+#LetsTrust-TPM
+
+LetsTrust-TPM is a TPM2.0 daughter board for the Raspberry Pi platform based on an Infineon SLB9670 chip.
+It is compatible with all Raspberry Pi models and probably the smallest available addon board on the market.
+The TPM can be used e.g. as a secure keystore or as an hwrng.
+
+In order to use it your kernel must have the following options enabled:
+```kernelconfig
+ CONFIG_HW_RANDOM_TPM=m
+ CONFIG_TCG_TPM=m
+ CONFIG_TCG_TIS_CORE=m
+ CONFIG_TCG_TIS_SPI=m
+ CONFIG_SECURITYFS=y
+```
+and a suitable device tree overlay:
+```dts
+ slb9670: slb9670@0{
+ compatible = "infineon,slb9670";
+ reg = <1>; /* CE1 */
+ #address-cells = <1>;
+ #size-cells = <0>;
+ spi-max-frequency = <32000000>;
+ status = "okay";
+ };
+```
+
+Per default CE1 is used as chip select, CE0 can also be used by resoldering a 0-ohm resistor.
+
+A full dts overlay is available here,
+or you can also find a precompiled image with TPM support and the complete build-instructions at letstrust.de.