[1/1] efi_loader: document functions in efi_rng.c

diff --git a/doc/api/efi.rst b/doc/api/efi.rst
index 2ca344932e..bc59382608 100644
--- a/doc/api/efi.rst
+++ b/doc/api/efi.rst
@@ -131,6 +131,12 @@  Network protocols
 .. kernel-doc:: lib/efi_loader/efi_net.c
    :internal:

+Random number generator protocol
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. kernel-doc:: lib/efi_loader/efi_rng.c
+   :internal:
+
 Text IO protocols
 ~~~~~~~~~~~~~~~~~

diff --git a/lib/efi_loader/efi_rng.c b/lib/efi_loader/efi_rng.c
index 432c986204..a1d0ec842c 100644
--- a/lib/efi_loader/efi_rng.c
+++ b/lib/efi_loader/efi_rng.c
@@ -13,6 +13,17 @@  DECLARE_GLOBAL_DATA_PTR;

 const efi_guid_t efi_guid_rng_protocol = EFI_RNG_PROTOCOL_GUID;

+/**
+ * platform_get_rng_device() - retrieve random number generator
+ *
+ * This function retrieves the udevice implementing a hardware random
+ * number generator.
+ *
+ * This function may be overridden if special initialization is needed.
+ *
+ * @dev:	udevice
+ * Return:	status code
+ */
 __weak efi_status_t platform_get_rng_device(struct udevice **dev)
 {
 	int ret;
@@ -29,6 +40,18 @@  __weak efi_status_t platform_get_rng_device(struct udevice **dev)
 	return EFI_SUCCESS;
 }

+/**
+ * rng_getinfo() - get information about random number generation
+ *
+ * This function implement the GetInfo() service of the EFI random number
+ * generator protocol. See the UEFI spec for details.
+ *
+ * @this:			random number generator protocol instance
+ * @rng_algorithm_list_size:	number of random number generation algorithms
+ * @rng_algorithm_list:		descriptions of random number generation
+ *				algorithms
+ * Return:			status code
+ */
 static efi_status_t EFIAPI rng_getinfo(struct efi_rng_protocol *this,
 				       efi_uintn_t *rng_algorithm_list_size,
 				       efi_guid_t *rng_algorithm_list)
@@ -64,6 +87,18 @@  back:
 	return EFI_EXIT(ret);
 }

+/**
+ * rng_getrng() - get random value
+ *
+ * This function implement the GetRng() service of the EFI random number
+ * generator protocol. See the UEFI spec for details.
+ *
+ * @this:		random number generator protocol instance
+ * @rng_algorithm:	random number generation algorithm
+ * @rng_value_length:	number of random bytes to generate, buffer length
+ * @rng_value:		buffer to receive random bytes
+ * Return:		status code
+ */
 static efi_status_t EFIAPI getrng(struct efi_rng_protocol *this,
 				  efi_guid_t *rng_algorithm,
 				  efi_uintn_t rng_value_length,