[PATCH 3/3] crypto: document __ENV__ lookup in CRYPTO_PUBLIC_KEYS

[Bastian Krause]

Signed-off-by: Bastian Krause <bst at pengutronix.de>
---
 crypto/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 191bd510262..14728be4aa9 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -144,6 +144,10 @@ config CRYPTO_PUBLIC_KEYS
 	  This avoids the mkimage dependency of CONFIG_BOOTM_FITIMAGE_PUBKEY
 	  at the cost of an openssl build-time dependency.
 
+	  Placeholders such as __ENV__VAR_NAME can be used to look up the
+	  corresponding value in the environment variable VAR_NAME for both
+	  public key paths/URIs as well as key name hints.
+
 config CRYPTO_KEYSTORE
 	bool "Keystore"
 	help
-- 
2.39.5