[U-Boot] [PATCH V3 1/4] fdtdec: fix parsing 'reg' property with zero value in '#size-cells'

[Przemyslaw Marczak]

After rework of lib/fdtdec.c by:

commit: 02464e3 fdt: add new fdt address parsing functions

the function fdtdec_get_addr() doesn't work as previous,
because the implementation assumes that properties '#address-cells'
and '#size-cells' are equal to 1, which can be not true sometimes.

The new API introduced fdtdec_get_addr_size_auto_parent() for the 'reg'
property parsing, but the implementation assumes, that #size-cells
can't be less than 1.

This causes that the following children's 'reg' property can't be reached:

parent at 0x0 {
     #address-cells = <1>;
     #size-cells = <0>;
     children at 0x100 {
         reg = < 0x100 >;
     };
};

Change the condition value from '1' to '0', which allows parsing property
with at least zero #size-cells, fixes the issue.

Now, fdtdec_get_addr_size_auto_parent() works properly.

Tested on: Odroid U3/X2, Trats, Trats2, Odroid XU3, Snow (by Simon).

Signed-off-by: Przemyslaw Marczak <p.marczak at samsung.com>
Acked-by: Stephen Warren <swarren at nvidia.com>
Acked-by: Simon Glass <sjg at chromium.org>
Tested-by: Simon Glass <sjg at chromium.org>
---
Changes V2:
- cleanup commit message
- add acked-by
Changes V3:
- add acked-by and tested-by Simon
---
 lib/fdtdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 9f0b65d..9cf57b9 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -149,7 +149,7 @@ fdt_addr_t fdtdec_get_addr_size_auto_parent(const void *blob, int parent,
 	}
 
 	ns = fdt_size_cells(blob, parent);
-	if (ns < 1) {
+	if (ns < 0) {
 		debug("(bad #size-cells)\n");
 		return FDT_ADDR_T_NONE;
 	}
-- 
1.9.1