dm: allow limiting pre-reloc markings to spl or tpl

Right now the u-boot,dm-pre-reloc flag will make each marked node
always appear in both spl and tpl. But systems needing an additional
tpl might have special constraints for each, like the spl needing to
be very tiny.

So introduce two additional flags to mark nodes for only spl or tpl
environments and introduce a function dm_fdt_pre_reloc to automate
the necessary checks in code instances checking for pre-relocation
flags.

The behaviour of the original flag stays untouched and still marks
a node for both spl and tpl.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Kever Yang <kever.yang@rock-chips.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/include/dm/util.h b/include/dm/util.h
index 15daa3d19f..32060ab30e 100644
--- a/include/dm/util.h
+++ b/include/dm/util.h
@@ -48,4 +48,30 @@ static inline void dm_dump_devres(void)
 }
 #endif
 
+/**
+ * Check if a dt node should be or was bound before relocation.
+ *
+ * Devicetree nodes can be marked as needed to be bound
+ * in the loader stages via special devicetree properties.
+ *
+ * Before relocation this function can be used to check if nodes
+ * are required in either SPL or TPL stages.
+ *
+ * After relocation and jumping into the real U-Boot binary
+ * it is possible to determine if a node was bound in one of
+ * SPL/TPL stages.
+ *
+ * There are 3 settings currently in use
+ * -
+ * - u-boot,dm-pre-reloc: legacy and indicates any of TPL or SPL
+ *   Existing platforms only use it to indicate nodes needee in
+ *   SPL. Should probably be replaced by u-boot,dm-spl for
+ *   existing platforms.
+ * @blob: devicetree
+ * @offset: node offset
+ *
+ * Returns true if node is needed in SPL/TL, false otherwise.
+ */
+int dm_fdt_pre_reloc(const void *blob, int offset);
+
 #endif