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- From 6fa9e3678eb002246df1280322b6a024853950a5 Mon Sep 17 00:00:00 2001
- From: Ansuel Smith <ansuelsmth@gmail.com>
- Date: Mon, 11 Oct 2021 00:53:14 +0200
- Subject: [PATCH] drivers: mtd: parsers: add nvmem support to cmdlinepart
- Assuming cmdlinepart is only one level deep partition scheme and that
- static partition are also defined in DTS, we can assign an of_node for
- partition declared from bootargs. cmdlinepart have priority than
- fiexed-partition parser so in this specific case the parser doesn't
- assign an of_node. Fix this by searching a defined of_node using a
- similar fixed_partition parser and if a partition is found with the same
- label, check that it has the same offset and size and return the DT
- of_node to correctly use NVMEM cells.
- Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
- ---
- drivers/mtd/parsers/cmdlinepart.c | 71 +++++++++++++++++++++++++++++++
- 1 file changed, 71 insertions(+)
- --- a/drivers/mtd/parsers/cmdlinepart.c
- +++ b/drivers/mtd/parsers/cmdlinepart.c
- @@ -43,6 +43,7 @@
- #include <linux/mtd/partitions.h>
- #include <linux/module.h>
- #include <linux/err.h>
- +#include <linux/of.h>
-
- /* debug macro */
- #if 0
- @@ -323,6 +324,68 @@ static int mtdpart_setup_real(char *s)
- return 0;
- }
-
- +static int search_fixed_partition(struct mtd_info *master,
- + struct mtd_partition *target_part,
- + struct mtd_partition *fixed_part)
- +{
- + struct device_node *mtd_node;
- + struct device_node *ofpart_node;
- + struct device_node *pp;
- + struct mtd_partition part;
- + const char *partname;
- +
- + mtd_node = mtd_get_of_node(master);
- + if (!mtd_node)
- + return -EINVAL;
- +
- + ofpart_node = of_get_child_by_name(mtd_node, "partitions");
- +
- + for_each_child_of_node(ofpart_node, pp) {
- + const __be32 *reg;
- + int len;
- + int a_cells, s_cells;
- +
- + reg = of_get_property(pp, "reg", &len);
- + if (!reg) {
- + pr_debug("%s: ofpart partition %pOF (%pOF) missing reg property.\n",
- + master->name, pp,
- + mtd_node);
- + continue;
- + }
- +
- + a_cells = of_n_addr_cells(pp);
- + s_cells = of_n_size_cells(pp);
- + if (len / 4 != a_cells + s_cells) {
- + pr_debug("%s: ofpart partition %pOF (%pOF) error parsing reg property.\n",
- + master->name, pp,
- + mtd_node);
- + continue;
- + }
- +
- + part.offset = of_read_number(reg, a_cells);
- + part.size = of_read_number(reg + a_cells, s_cells);
- + part.of_node = pp;
- +
- + partname = of_get_property(pp, "label", &len);
- + if (!partname)
- + partname = of_get_property(pp, "name", &len);
- + part.name = partname;
- +
- + if (!strncmp(target_part->name, part.name, len)) {
- + if (part.offset != target_part->offset)
- + return -EINVAL;
- +
- + if (part.size != target_part->size)
- + return -EINVAL;
- +
- + memcpy(fixed_part, &part, sizeof(struct mtd_partition));
- + return 0;
- + }
- + }
- +
- + return -EINVAL;
- +}
- +
- /*
- * Main function to be called from the MTD mapping driver/device to
- * obtain the partitioning information. At this point the command line
- @@ -338,6 +401,7 @@ static int parse_cmdline_partitions(stru
- int i, err;
- struct cmdline_mtd_partition *part;
- const char *mtd_id = master->name;
- + struct mtd_partition fixed_part;
-
- /* parse command line */
- if (!cmdline_parsed) {
- @@ -382,6 +446,13 @@ static int parse_cmdline_partitions(stru
- sizeof(*part->parts) * (part->num_parts - i));
- i--;
- }
- +
- + err = search_fixed_partition(master, &part->parts[i], &fixed_part);
- + if (!err) {
- + part->parts[i].of_node = fixed_part.of_node;
- + pr_info("Found partition defined in DT for %s. Assigning OF node to support nvmem.",
- + part->parts[i].name);
- + }
- }
-
- *pparts = kmemdup(part->parts, sizeof(*part->parts) * part->num_parts,
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