mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-30 10:39:04 +00:00
bde5e7a632
This backports upstream support for "compatible" DT property set for the "partitions" subnode of flash node. It allows specifying how partitions should be created/parsed. Right now only "fixed-partitions" is supported. It should eventually replace our downstream "linux,part-probe" solution. Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
122 lines
3.5 KiB
Diff
122 lines
3.5 KiB
Diff
From bb2192123ec70470d6ea33f138846b175403a968 Mon Sep 17 00:00:00 2001
|
|
From: Brian Norris <computersforpeace@gmail.com>
|
|
Date: Thu, 4 Jan 2018 08:05:33 +0100
|
|
Subject: [PATCH] mtd: partitions: add of_match_table parser matching
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
Partition parsers can now provide an of_match_table to enable
|
|
flash<-->parser matching via device tree as documented in the
|
|
mtd/partition.txt.
|
|
|
|
It works by looking for a matching parser for every string in the
|
|
"compatibility" property (starting with the most specific one).
|
|
|
|
This support is currently limited to built-in parsers as it uses
|
|
request_module() and friends. This should be sufficient for most cases
|
|
though as compiling parsers as modules isn't a common choice.
|
|
|
|
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
|
|
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
|
|
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
|
|
---
|
|
drivers/mtd/mtdpart.c | 59 ++++++++++++++++++++++++++++++++++++++++++
|
|
include/linux/mtd/partitions.h | 1 +
|
|
2 files changed, 60 insertions(+)
|
|
|
|
--- a/drivers/mtd/mtdpart.c
|
|
+++ b/drivers/mtd/mtdpart.c
|
|
@@ -30,6 +30,7 @@
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/partitions.h>
|
|
#include <linux/err.h>
|
|
+#include <linux/of.h>
|
|
|
|
#include "mtdcore.h"
|
|
|
|
@@ -894,6 +895,45 @@ static int mtd_part_do_parse(struct mtd_
|
|
}
|
|
|
|
/**
|
|
+ * mtd_part_get_compatible_parser - find MTD parser by a compatible string
|
|
+ *
|
|
+ * @compat: compatible string describing partitions in a device tree
|
|
+ *
|
|
+ * MTD parsers can specify supported partitions by providing a table of
|
|
+ * compatibility strings. This function finds a parser that advertises support
|
|
+ * for a passed value of "compatible".
|
|
+ */
|
|
+static struct mtd_part_parser *mtd_part_get_compatible_parser(const char *compat)
|
|
+{
|
|
+ struct mtd_part_parser *p, *ret = NULL;
|
|
+
|
|
+ spin_lock(&part_parser_lock);
|
|
+
|
|
+ list_for_each_entry(p, &part_parsers, list) {
|
|
+ const struct of_device_id *matches;
|
|
+
|
|
+ matches = p->of_match_table;
|
|
+ if (!matches)
|
|
+ continue;
|
|
+
|
|
+ for (; matches->compatible[0]; matches++) {
|
|
+ if (!strcmp(matches->compatible, compat) &&
|
|
+ try_module_get(p->owner)) {
|
|
+ ret = p;
|
|
+ break;
|
|
+ }
|
|
+ }
|
|
+
|
|
+ if (ret)
|
|
+ break;
|
|
+ }
|
|
+
|
|
+ spin_unlock(&part_parser_lock);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+/**
|
|
* parse_mtd_partitions - parse MTD partitions
|
|
* @master: the master partition (describes whole MTD device)
|
|
* @types: names of partition parsers to try or %NULL
|
|
@@ -919,8 +959,27 @@ int parse_mtd_partitions(struct mtd_info
|
|
struct mtd_part_parser_data *data)
|
|
{
|
|
struct mtd_part_parser *parser;
|
|
+ struct device_node *np;
|
|
+ struct property *prop;
|
|
+ const char *compat;
|
|
int ret, err = 0;
|
|
|
|
+ np = of_get_child_by_name(mtd_get_of_node(master), "partitions");
|
|
+ of_property_for_each_string(np, "compatible", prop, compat) {
|
|
+ parser = mtd_part_get_compatible_parser(compat);
|
|
+ if (!parser)
|
|
+ continue;
|
|
+ ret = mtd_part_do_parse(parser, master, pparts, data);
|
|
+ if (ret > 0) {
|
|
+ of_node_put(np);
|
|
+ return 0;
|
|
+ }
|
|
+ mtd_part_parser_put(parser);
|
|
+ if (ret < 0 && !err)
|
|
+ err = ret;
|
|
+ }
|
|
+ of_node_put(np);
|
|
+
|
|
if (!types)
|
|
types = default_mtd_part_types;
|
|
|
|
--- a/include/linux/mtd/partitions.h
|
|
+++ b/include/linux/mtd/partitions.h
|
|
@@ -77,6 +77,7 @@ struct mtd_part_parser {
|
|
struct list_head list;
|
|
struct module *owner;
|
|
const char *name;
|
|
+ const struct of_device_id *of_match_table;
|
|
int (*parse_fn)(struct mtd_info *, const struct mtd_partition **,
|
|
struct mtd_part_parser_data *);
|
|
void (*cleanup)(const struct mtd_partition *pparts, int nr_parts);
|