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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
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From: Brian Norris <computersforpeace@gmail.com>
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Date: Thu, 4 Jan 2018 08:05:33 +0100
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Subject: [PATCH] mtd: partitions: add of_match_table parser matching
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Partition parsers can now provide an of_match_table to enable
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flash<-->parser matching via device tree as documented in the
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mtd/partition.txt.
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It works by looking for a matching parser for every string in the
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"compatibility" property (starting with the most specific one).
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This support is currently limited to built-in parsers as it uses
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request_module() and friends. This should be sufficient for most cases
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though as compiling parsers as modules isn't a common choice.
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
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---
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drivers/mtd/mtdpart.c | 59 ++++++++++++++++++++++++++++++++++++++++++
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include/linux/mtd/partitions.h | 1 +
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2 files changed, 60 insertions(+)
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -30,6 +30,7 @@
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/err.h>
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+#include <linux/of.h>
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#include "mtdcore.h"
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@@ -886,6 +887,45 @@ static int mtd_part_do_parse(struct mtd_
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}
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/**
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+ * mtd_part_get_compatible_parser - find MTD parser by a compatible string
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+ *
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+ * @compat: compatible string describing partitions in a device tree
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+ *
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+ * MTD parsers can specify supported partitions by providing a table of
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+ * compatibility strings. This function finds a parser that advertises support
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+ * for a passed value of "compatible".
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+ */
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+static struct mtd_part_parser *mtd_part_get_compatible_parser(const char *compat)
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+{
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+ struct mtd_part_parser *p, *ret = NULL;
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+
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+ spin_lock(&part_parser_lock);
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+
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+ list_for_each_entry(p, &part_parsers, list) {
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+ const struct of_device_id *matches;
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+
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+ matches = p->of_match_table;
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+ if (!matches)
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+ continue;
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+
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+ for (; matches->compatible[0]; matches++) {
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+ if (!strcmp(matches->compatible, compat) &&
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+ try_module_get(p->owner)) {
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+ ret = p;
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+ break;
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+ }
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+ }
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+
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+ if (ret)
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+ break;
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+ }
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+
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+ spin_unlock(&part_parser_lock);
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+
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+ return ret;
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+}
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+
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+/**
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* parse_mtd_partitions - parse MTD partitions
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* @master: the master partition (describes whole MTD device)
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* @types: names of partition parsers to try or %NULL
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@@ -911,8 +951,27 @@ int parse_mtd_partitions(struct mtd_info
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struct mtd_part_parser_data *data)
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{
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struct mtd_part_parser *parser;
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+ struct device_node *np;
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+ struct property *prop;
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+ const char *compat;
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int ret, err = 0;
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+ np = of_get_child_by_name(mtd_get_of_node(master), "partitions");
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+ of_property_for_each_string(np, "compatible", prop, compat) {
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+ parser = mtd_part_get_compatible_parser(compat);
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+ if (!parser)
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+ continue;
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+ ret = mtd_part_do_parse(parser, master, pparts, data);
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+ if (ret > 0) {
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+ of_node_put(np);
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+ return 0;
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+ }
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+ mtd_part_parser_put(parser);
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+ if (ret < 0 && !err)
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+ err = ret;
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+ }
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+ of_node_put(np);
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+
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if (!types)
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types = default_mtd_part_types;
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--- a/include/linux/mtd/partitions.h
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+++ b/include/linux/mtd/partitions.h
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@@ -77,6 +77,7 @@ struct mtd_part_parser {
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struct list_head list;
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struct module *owner;
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const char *name;
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+ const struct of_device_id *of_match_table;
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int (*parse_fn)(struct mtd_info *, const struct mtd_partition **,
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struct mtd_part_parser_data *);
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void (*cleanup)(const struct mtd_partition *pparts, int nr_parts);
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