From: Cedric Neveux <cedric.neveux@nxp.com>
Date: Tue, 17 Apr 2018 16:04:39 +0000 (+0200)
Subject: MLK-17909 RNG Instantation done in Secure Firmware
X-Git-Tag: C0P2-H0.0--20200415~39
X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=5e23f9d6114784d77fd4ed5848953356c3575532;p=linux.git

MLK-17909 RNG Instantation done in Secure Firmware

   - For i.MX 6 and 7 check if the Secure Firmware (OPTEE) is present.
     If present don't do the RNG instantation in the CAAM driver

Reviewed-by: Silvano Di Ninno <silvano.dininno@nxp.com>
Signed-off-by: Cedric Neveux <cedric.neveux@nxp.com>
(cherry picked from commit 2b9489d18b6eca5b1f72689602f0eed16e88db84)
---

diff --git a/drivers/crypto/caam/inst_rng.c b/drivers/crypto/caam/inst_rng.c
index dff81786ceef..64c382604cc8 100644
--- a/drivers/crypto/caam/inst_rng.c
+++ b/drivers/crypto/caam/inst_rng.c
@@ -1,7 +1,7 @@
 /*
  * CAAM RNG instantiation driver backend
  *
- * Copyright 2017 NXP
+ * Copyright 2017-2018 NXP
  */
 
 #include <linux/device.h>
@@ -286,6 +286,17 @@ int inst_rng_imx6(struct platform_device *pdev)
 	ctrlpriv = dev_get_drvdata(ctrldev);
 	ctrl = (struct caam_ctrl __iomem *)ctrlpriv->ctrl;
 
+#ifndef CONFIG_ARM64
+	/*
+	 * Check if the Secure Firmware is running,
+	 * check only for i.MX6 and i.MX7
+	 */
+	if (of_find_compatible_node(NULL, NULL, "linaro,optee-tz")) {
+		pr_info("RNG Instantation done by Secure Firmware\n");
+		return ret;
+	}
+#endif
+
 	cha_vid_ls = rd_reg32(&ctrl->perfmon.cha_id_ls);
 	/*
 	 * If SEC has RNG version >= 4 and RNG state handle has not been