diff options
Diffstat (limited to 'pkgs/patches-linux-5.15/402-v5.20-mtd-next-mtd-core-introduce-of-support-for-dynamic-partitions.patch')
| -rw-r--r-- | pkgs/patches-linux-5.15/402-v5.20-mtd-next-mtd-core-introduce-of-support-for-dynamic-partitions.patch | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/pkgs/patches-linux-5.15/402-v5.20-mtd-next-mtd-core-introduce-of-support-for-dynamic-partitions.patch b/pkgs/patches-linux-5.15/402-v5.20-mtd-next-mtd-core-introduce-of-support-for-dynamic-partitions.patch new file mode 100644 index 0000000..8b8e478 --- /dev/null +++ b/pkgs/patches-linux-5.15/402-v5.20-mtd-next-mtd-core-introduce-of-support-for-dynamic-partitions.patch @@ -0,0 +1,106 @@ +From ad9b10d1eaada169bd764abcab58f08538877e26 Mon Sep 17 00:00:00 2001 +From: Christian Marangi <ansuelsmth@gmail.com> +Date: Wed, 22 Jun 2022 03:06:28 +0200 +Subject: mtd: core: introduce of support for dynamic partitions + +We have many parser that register mtd partitions at runtime. One example +is the cmdlinepart or the smem-part parser where the compatible is defined +in the dts and the partitions gets detected and registered by the +parser. This is problematic for the NVMEM subsystem that requires an OF +node to detect NVMEM cells. + +To fix this problem, introduce an additional logic that will try to +assign an OF node to the MTD if declared. + +On MTD addition, it will be checked if the MTD has an OF node and if +not declared will check if a partition with the same label / node name is +declared in DTS. If an exact match is found, the partition dynamically +allocated by the parser will have a connected OF node. + +The NVMEM subsystem will detect the OF node and register any NVMEM cells +declared statically in the DTS. + +Signed-off-by: Christian Marangi <ansuelsmth@gmail.com> +Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> +Link: https://lore.kernel.org/linux-mtd/20220622010628.30414-4-ansuelsmth@gmail.com +--- + drivers/mtd/mtdcore.c | 61 +++++++++++++++++++++++++++++++++++++++++++ + 1 file changed, 61 insertions(+) + +--- a/drivers/mtd/mtdcore.c ++++ b/drivers/mtd/mtdcore.c +@@ -564,6 +564,66 @@ static int mtd_nvmem_add(struct mtd_info + return 0; + } + ++static void mtd_check_of_node(struct mtd_info *mtd) ++{ ++ struct device_node *partitions, *parent_dn, *mtd_dn = NULL; ++ const char *pname, *prefix = "partition-"; ++ int plen, mtd_name_len, offset, prefix_len; ++ struct mtd_info *parent; ++ bool found = false; ++ ++ /* Check if MTD already has a device node */ ++ if (dev_of_node(&mtd->dev)) ++ return; ++ ++ /* Check if a partitions node exist */ ++ parent = mtd->parent; ++ parent_dn = dev_of_node(&parent->dev); ++ if (!parent_dn) ++ return; ++ ++ partitions = of_get_child_by_name(parent_dn, "partitions"); ++ if (!partitions) ++ goto exit_parent; ++ ++ prefix_len = strlen(prefix); ++ mtd_name_len = strlen(mtd->name); ++ ++ /* Search if a partition is defined with the same name */ ++ for_each_child_of_node(partitions, mtd_dn) { ++ offset = 0; ++ ++ /* Skip partition with no/wrong prefix */ ++ if (!of_node_name_prefix(mtd_dn, "partition-")) ++ continue; ++ ++ /* Label have priority. Check that first */ ++ if (of_property_read_string(mtd_dn, "label", &pname)) { ++ of_property_read_string(mtd_dn, "name", &pname); ++ offset = prefix_len; ++ } ++ ++ plen = strlen(pname) - offset; ++ if (plen == mtd_name_len && ++ !strncmp(mtd->name, pname + offset, plen)) { ++ found = true; ++ break; ++ } ++ } ++ ++ if (!found) ++ goto exit_partitions; ++ ++ /* Set of_node only for nvmem */ ++ if (of_device_is_compatible(mtd_dn, "nvmem-cells")) ++ mtd_set_of_node(mtd, mtd_dn); ++ ++exit_partitions: ++ of_node_put(partitions); ++exit_parent: ++ of_node_put(parent_dn); ++} ++ + /** + * add_mtd_device - register an MTD device + * @mtd: pointer to new MTD device info structure +@@ -669,6 +729,7 @@ int add_mtd_device(struct mtd_info *mtd) + mtd->dev.devt = MTD_DEVT(i); + dev_set_name(&mtd->dev, "mtd%d", i); + dev_set_drvdata(&mtd->dev, mtd); ++ mtd_check_of_node(mtd); + of_node_get(mtd_get_of_node(mtd)); + error = device_register(&mtd->dev); + if (error) |