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Subject[PATCH v3 1/3] include/of_fdt.h: add a weak arch hook to update fdt pgprot
Date
Does nothing as default, arch can implement their function to map
fdt to RO/RW. This is convenient if arch map fdt to RO during init
but needs to write fdt in some special cases after that.

Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
---
drivers/of/fdt.c | 13 +++++++++++++
include/linux/of_fdt.h | 2 ++
2 files changed, 15 insertions(+)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index de893c9616a1..e84971d1e9ea 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -30,6 +30,19 @@

#include "of_private.h"

+/*
+ * update_fdt_pgprot - Arch hook for changing fdt pgprot
+ *
+ * @prot: page protection flags for fdt
+ *
+ * Architecture can implement this function if they want to chagne
+ * fdt page protection flags before or after doing modification and
+ * fixups to fdt.
+ *
+ * Default does nothing.
+ */
+__weak void update_fdt_pgprot(pgprot_t prot) {}
+
/*
* of_fdt_limit_memory - limit the number of regions in the /memory node
* @limit: maximum entries
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index a713e5d156d8..406c3e7b2b75 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -109,5 +109,7 @@ static inline void unflatten_device_tree(void) {}
static inline void unflatten_and_copy_device_tree(void) {}
#endif /* CONFIG_OF_EARLY_FLATTREE */

+extern void update_fdt_pgprot(pgprot_t prot);
+
#endif /* __ASSEMBLY__ */
#endif /* _LINUX_OF_FDT_H */
--
2.20.1
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