diff --git a/drivers/firmware/scmi/sandbox-scmi_agent.c b/drivers/firmware/scmi/sandbox-scmi_agent.c
index 19be280..74a8783 100644
--- a/drivers/firmware/scmi/sandbox-scmi_agent.c
+++ b/drivers/firmware/scmi/sandbox-scmi_agent.c
@@ -80,9 +80,9 @@
 };
 
 static struct sandbox_scmi_clk scmi_clk[] = {
-	{ .rate = 333 },
-	{ .rate = 200 },
-	{ .rate = 1000 },
+	{ .rate = 333, .perm = 0xE0000000 },
+	{ .rate = 200, .perm = 0xE0000000 },
+	{ .rate = 1000, .perm = 0xE0000000 },
 };
 
 static struct sandbox_scmi_reset scmi_reset[] = {
@@ -700,6 +700,21 @@
 
 /* Clock Protocol */
 
+static int sandbox_scmi_clock_protocol_version(struct udevice *dev,
+					       struct scmi_msg *msg)
+{
+	struct scmi_protocol_version_out *out = NULL;
+
+	if (!msg->out_msg || msg->out_msg_sz < sizeof(*out))
+		return -EINVAL;
+
+	out = (struct scmi_protocol_version_out *)msg->out_msg;
+	out->version = 0x30000;
+	out->status = SCMI_SUCCESS;
+
+	return 0;
+}
+
 static int sandbox_scmi_clock_protocol_attribs(struct udevice *dev,
 					       struct scmi_msg *msg)
 {
@@ -740,6 +755,9 @@
 		if (clk_state->enabled)
 			out->attributes = 1;
 
+		/* Restricted clock */
+		out->attributes |= BIT(1);
+
 		ret = snprintf(out->clock_name, sizeof(out->clock_name),
 			       "clk%u", in->clock_id);
 		assert(ret > 0 && ret < sizeof(out->clock_name));
@@ -837,6 +855,34 @@
 	return 0;
 }
 
+static int sandbox_scmi_clock_permissions_get(struct udevice *dev,
+					      struct scmi_msg *msg)
+{
+	struct scmi_clk_get_permissions_in *in = NULL;
+	struct scmi_clk_get_permissions_out *out = NULL;
+	struct sandbox_scmi_clk *clk_state = NULL;
+
+	if (!msg->in_msg || msg->in_msg_sz < sizeof(*in) ||
+	    !msg->out_msg || msg->out_msg_sz < sizeof(*out))
+		return -EINVAL;
+
+	in = (struct scmi_clk_get_permissions_in *)msg->in_msg;
+	out = (struct scmi_clk_get_permissions_out *)msg->out_msg;
+
+	clk_state = get_scmi_clk_state(in->clock_id);
+	if (!clk_state) {
+		dev_err(dev, "Unexpected clock ID %u\n", in->clock_id);
+
+		out->status = SCMI_NOT_FOUND;
+	} else {
+		out->permissions = clk_state->perm;
+
+		out->status = SCMI_SUCCESS;
+	}
+
+	return 0;
+}
+
 static int sandbox_scmi_rd_attribs(struct udevice *dev, struct scmi_msg *msg)
 {
 	struct scmi_rd_attr_in *in = NULL;
@@ -1193,6 +1239,8 @@
 			return sandbox_proto_not_supported(msg);
 
 		switch (msg->message_id) {
+		case SCMI_PROTOCOL_VERSION:
+			return sandbox_scmi_clock_protocol_version(dev, msg);
 		case SCMI_PROTOCOL_ATTRIBUTES:
 			return sandbox_scmi_clock_protocol_attribs(dev, msg);
 		case SCMI_CLOCK_ATTRIBUTES:
@@ -1203,6 +1251,8 @@
 			return sandbox_scmi_clock_rate_get(dev, msg);
 		case SCMI_CLOCK_CONFIG_SET:
 			return sandbox_scmi_clock_gate(dev, msg);
+		case SCMI_CLOCK_GET_PERMISSIONS:
+			return sandbox_scmi_clock_permissions_get(dev, msg);
 		default:
 			break;
 		}