Update and document mbedtls extensions
Signed-off-by: Archana <archana.madhavan@silabs.com>
Signed-off-by: Asfandyar Orakzai <asfandyar.orakzai@silabs.com>
diff --git a/docs/proposed/psa-driver-developer-guide.md b/docs/proposed/psa-driver-developer-guide.md
index 70cb9d3..b39f559 100644
--- a/docs/proposed/psa-driver-developer-guide.md
+++ b/docs/proposed/psa-driver-developer-guide.md
@@ -36,6 +36,12 @@
Mbed TLS calls driver entry points [as specified in the PSA Cryptography Driver Interface specification](psa-driver-interface.html#driver-entry-points) except as otherwise indicated in this section.
+## Mbed TLS extensions
+
+The driver description can include Mbed TLS extensions (marked by the namespace "mbedtls"). Mbed TLS extensions are meant to extend/help integrating the driver into the library's infrastructure.
+* `"mbedtls/h_condition"` (optional, string) can include complex preprocessor definitions to conditionally include header files for a given driver.
+* `"mbedtls/c_condition"` (optional, string) can include complex preprocessor definitions to conditionally enable dispatch capabilities for a driver.
+
## Building and testing your driver
<!-- TODO -->