mtd: parsers: ofpart: add workaround for #size-cells 0

Add a mechanism to handle the case in which partitions are present as
direct child of the nand controller node and #size-cells is set to <0>.

This could happen if the nand-controller node in the DTS is supposed to
have #size-cells set to 0, but for some historical reason/bug it was set
to 1 in the past, and the firmware (e.g. U-Boot) is adding the partition
as direct children of the nand-controller defaulting to #size-cells
being to 1.

This prevents a real boot failure on colibri-imx7 that happened during v6.1
development cycles.

Link: https://lore.kernel.org/all/Y4dgBTGNWpM6SQXI@francesco-nb.int.toradex.com/
Link: https://lore.kernel.org/all/20221202071900.1143950-1-francesco@dolcini.it/
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230124104444.330913-1-francesco@dolcini.it

diff --git a/drivers/mtd/parsers/ofpart_core.c b/drivers/mtd/parsers/ofpart_core.c
index 192190c42fc84d3f8c8ba72465fa3c44bf5243e7..e7b8e9d0a910339a72bd243c7d74f3c41b2f6713 100644 (file)
--- a/drivers/mtd/parsers/ofpart_core.c
+++ b/drivers/mtd/parsers/ofpart_core.c
@@ -122,6 +122,25 @@ static int parse_fixed_partitions(struct mtd_info *master,
 
                a_cells = of_n_addr_cells(pp);
                s_cells = of_n_size_cells(pp);
+               if (!dedicated && s_cells == 0) {
+                       /*
+                        * This is a ugly workaround to not create
+                        * regression on devices that are still creating
+                        * partitions as direct children of the nand controller.
+                        * This can happen in case the nand controller node has
+                        * #size-cells equal to 0 and the firmware (e.g.
+                        * U-Boot) just add the partitions there assuming
+                        * 32-bit addressing.
+                        *
+                        * If you get this warning your firmware and/or DTS
+                        * should be really fixed.
+                        *
+                        * This is working only for devices smaller than 4GiB.
+                        */
+                       pr_warn("%s: ofpart partition %pOF (%pOF) #size-cells is wrongly set to <0>, assuming <1> for parsing partitions.\n",
+                               master->name, pp, mtd_node);
+                       s_cells = 1;
+               }
                if (len / 4 != a_cells + s_cells) {
                        pr_debug("%s: ofpart partition %pOF (%pOF) error parsing reg property.\n",
                                 master->name, pp,