ARM: stm32mp: add ETZPC system bus driver for STM32MP1
This driver is checking the access rights of the different
peripherals connected to the ETZPC bus. If access is denied,
the associated device is not bound.
Signed-off-by: Lionel Debieve <lionel.debieve@foss.st.com>
Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
diff --git a/arch/arm/mach-stm32mp/include/mach/etzpc.h b/arch/arm/mach-stm32mp/include/mach/etzpc.h
new file mode 100644
index 0000000..fd697c3
--- /dev/null
+++ b/arch/arm/mach-stm32mp/include/mach/etzpc.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause */
+/*
+ * Copyright (C) 2023, STMicroelectronics - All Rights Reserved
+ */
+
+#ifndef MACH_ETZPC_H
+#define MACH_ETZPC_H
+
+#include <linux/types.h>
+
+/**
+ * stm32_etzpc_check_access - Check ETZPC accesses for given device node
+ *
+ * @device_node Node of the device for which the accesses are checked
+ *
+ * @returns 0 on success (if access is granted), -EINVAL if access is denied.
+ * Else, returns an appropriate negative ERRNO value
+ */
+int stm32_etzpc_check_access(ofnode device_node);
+
+/**
+ * stm32_etzpc_check_access_by_id - Check ETZPC accesses for given id
+ *
+ * @device_node Node of the device to get a reference on ETZPC
+ * @id ID of the resource to check
+ *
+ * @returns 0 on success (if access is granted), -EINVAL if access is denied.
+ * Else, returns an appropriate negative ERRNO value
+ */
+int stm32_etzpc_check_access_by_id(ofnode device_node, u32 id);
+
+#endif /* MACH_ETZPC_H*/