8a9273d51e
Copy backport, hack, pending patch and config from 6.1 to 6.6. Signed-off-by: Weijie Gao <hackpascal@gmail.com>
121 lines
3.5 KiB
Diff
121 lines
3.5 KiB
Diff
From 6fa9e3678eb002246df1280322b6a024853950a5 Mon Sep 17 00:00:00 2001
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From: Ansuel Smith <ansuelsmth@gmail.com>
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Date: Mon, 11 Oct 2021 00:53:14 +0200
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Subject: [PATCH] drivers: mtd: parsers: add nvmem support to cmdlinepart
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Assuming cmdlinepart is only one level deep partition scheme and that
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static partition are also defined in DTS, we can assign an of_node for
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partition declared from bootargs. cmdlinepart have priority than
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fiexed-partition parser so in this specific case the parser doesn't
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assign an of_node. Fix this by searching a defined of_node using a
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similar fixed_partition parser and if a partition is found with the same
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label, check that it has the same offset and size and return the DT
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of_node to correctly use NVMEM cells.
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Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
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---
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drivers/mtd/parsers/cmdlinepart.c | 71 +++++++++++++++++++++++++++++++
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1 file changed, 71 insertions(+)
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--- a/drivers/mtd/parsers/cmdlinepart.c
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+++ b/drivers/mtd/parsers/cmdlinepart.c
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@@ -43,6 +43,7 @@
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#include <linux/mtd/partitions.h>
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#include <linux/module.h>
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#include <linux/err.h>
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+#include <linux/of.h>
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/* debug macro */
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#if 0
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@@ -323,6 +324,68 @@ static int mtdpart_setup_real(char *s)
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return 0;
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}
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+static int search_fixed_partition(struct mtd_info *master,
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+ struct mtd_partition *target_part,
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+ struct mtd_partition *fixed_part)
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+{
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+ struct device_node *mtd_node;
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+ struct device_node *ofpart_node;
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+ struct device_node *pp;
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+ struct mtd_partition part;
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+ const char *partname;
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+
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+ mtd_node = mtd_get_of_node(master);
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+ if (!mtd_node)
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+ return -EINVAL;
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+
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+ ofpart_node = of_get_child_by_name(mtd_node, "partitions");
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+
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+ for_each_child_of_node(ofpart_node, pp) {
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+ const __be32 *reg;
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+ int len;
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+ int a_cells, s_cells;
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+
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+ reg = of_get_property(pp, "reg", &len);
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+ if (!reg) {
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+ pr_debug("%s: ofpart partition %pOF (%pOF) missing reg property.\n",
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+ master->name, pp,
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+ mtd_node);
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+ continue;
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+ }
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+
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+ a_cells = of_n_addr_cells(pp);
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+ s_cells = of_n_size_cells(pp);
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+ if (len / 4 != a_cells + s_cells) {
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+ pr_debug("%s: ofpart partition %pOF (%pOF) error parsing reg property.\n",
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+ master->name, pp,
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+ mtd_node);
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+ continue;
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+ }
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+
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+ part.offset = of_read_number(reg, a_cells);
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+ part.size = of_read_number(reg + a_cells, s_cells);
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+ part.of_node = pp;
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+
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+ partname = of_get_property(pp, "label", &len);
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+ if (!partname)
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+ partname = of_get_property(pp, "name", &len);
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+ part.name = partname;
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+
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+ if (!strncmp(target_part->name, part.name, len)) {
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+ if (part.offset != target_part->offset)
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+ return -EINVAL;
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+
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+ if (part.size != target_part->size)
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+ return -EINVAL;
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+
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+ memcpy(fixed_part, &part, sizeof(struct mtd_partition));
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+ return 0;
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+ }
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+ }
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+
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+ return -EINVAL;
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+}
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+
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/*
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* Main function to be called from the MTD mapping driver/device to
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* obtain the partitioning information. At this point the command line
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@@ -338,6 +401,7 @@ static int parse_cmdline_partitions(stru
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int i, err;
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struct cmdline_mtd_partition *part;
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const char *mtd_id = master->name;
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+ struct mtd_partition fixed_part;
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/* parse command line */
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if (!cmdline_parsed) {
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@@ -382,6 +446,13 @@ static int parse_cmdline_partitions(stru
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sizeof(*part->parts) * (part->num_parts - i));
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i--;
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}
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+
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+ err = search_fixed_partition(master, &part->parts[i], &fixed_part);
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+ if (!err) {
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+ part->parts[i].of_node = fixed_part.of_node;
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+ pr_info("Found partition defined in DT for %s. Assigning OF node to support nvmem.",
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+ part->parts[i].name);
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+ }
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}
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*pparts = kmemdup(part->parts, sizeof(*part->parts) * part->num_parts,
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