From 70812bb83da61decfd824482e9767db56b2cc932 Mon Sep 17 00:00:00 2001
From: Patrick Delaunay <patrick.delaunay@foss.st.com>
Date: Tue, 29 Mar 2022 14:21:24 +0200
Subject: [PATCH] tee: optee: bind rng optee driver

In U-Boot, the discovery of TA based on its UUID on the TEE bus is
not supported.

This patch only binds the driver associated to the new supported
OP-TEE TA = TA_HWRNG when this driver is enable.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
---
 drivers/tee/optee/core.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
index dad46aa388..a89d62aaf0 100644
--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -7,6 +7,7 @@
 #include <cpu_func.h>
 #include <dm.h>
 #include <dm/device_compat.h>
+#include <dm/lists.h>
 #include <log.h>
 #include <malloc.h>
 #include <tee.h>
@@ -641,6 +642,8 @@ static int optee_probe(struct udevice *dev)
 {
 	struct optee_pdata *pdata = dev_get_plat(dev);
 	u32 sec_caps;
+	struct udevice *child;
+	int ret;
 
 	if (!is_optee_api(pdata->invoke_fn)) {
 		dev_err(dev, "OP-TEE api uid mismatch\n");
@@ -665,6 +668,16 @@ static int optee_probe(struct udevice *dev)
 		return -ENOENT;
 	}
 
+	/*
+	 * in U-Boot, the discovery of TA on the TEE bus is not supported:
+	 * only bind the drivers associated to the supported OP-TEE TA
+	 */
+	if (IS_ENABLED(CONFIG_RNG_OPTEE)) {
+		ret = device_bind_driver(dev, "optee-rng", "optee-rng", &child);
+		if (ret)
+			return ret;
+	}
+
 	return 0;
 }
 
-- 
2.39.5