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From: Hauke Mehrtens <hauke@hauke-m.de>
Subject: mtd: part: add generic parsing of linux,part-probe
This moves the linux,part-probe device tree parsing code from
physmap_of.c to mtdpart.c. Now all drivers can use this feature by just
providing a reference to their device tree node in struct
mtd_part_parser_data.
THIS METHOD HAS BEEN DEPRECATED
Linux supports "compatible" property in the "partitions" subnode now. It
should be used to specify partitions format (and trigger proper parser
usage) if needed.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---
Documentation/devicetree/bindings/mtd/nand.txt | 16 +++++++++
drivers/mtd/maps/physmap_of.c | 46 +-------------------------
drivers/mtd/mtdpart.c | 45 +++++++++++++++++++++++++
3 files changed, 62 insertions(+), 45 deletions(-)
--- a/Documentation/devicetree/bindings/mtd/nand.txt
+++ b/Documentation/devicetree/bindings/mtd/nand.txt
@@ -44,6 +44,22 @@ Optional NAND chip properties:
used by the upper layers, and you want to make your NAND
as reliable as possible.
+- linux,part-probe: list of name as strings of the partition parser
+ which should be used to parse the partition table.
+ They will be tried in the specified ordering and
+ the next one will be used if the previous one
+ failed.
+
+ Example: linux,part-probe = "cmdlinepart", "ofpart";
+
+ This is also the default value, which will be used
+ if this attribute is not specified. It could be
+ that the flash driver in use overwrote the default
+ value and uses some other default.
+
+ Possible values are: bcm47xxpart, afs, ar7part,
+ ofoldpart, ofpart, bcm63xxpart, RedBoot, cmdlinepart
+
The ECC strength and ECC step size properties define the correction capability
of a controller. Together, they say a controller can correct "{strength} bit
errors per {size} bytes".
--- a/drivers/mtd/maps/physmap_of_core.c
+++ b/drivers/mtd/maps/physmap_of_core.c
@@ -114,37 +114,9 @@ static struct mtd_info *obsolete_probe(s
static const char * const part_probe_types_def[] = {
"cmdlinepart", "RedBoot", "ofpart", "ofoldpart", NULL };
-static const char * const *of_get_probes(struct device_node *dp)
-{
- const char **res;
- int count;
-
- count = of_property_count_strings(dp, "linux,part-probe");
- if (count < 0)
- return part_probe_types_def;
-
- res = kzalloc((count + 1) * sizeof(*res), GFP_KERNEL);
- if (!res)
- return NULL;
-
- count = of_property_read_string_array(dp, "linux,part-probe", res,
- count);
- if (count < 0)
- return NULL;
-
- return res;
-}
-
-static void of_free_probes(const char * const *probes)
-{
- if (probes != part_probe_types_def)
- kfree(probes);
-}
-
static const struct of_device_id of_flash_match[];
static int of_flash_probe(struct platform_device *dev)
{
- const char * const *part_probe_types;
const struct of_device_id *match;
struct device_node *dp = dev->dev.of_node;
struct resource res;
@@ -310,14 +282,8 @@ static int of_flash_probe(struct platfor
info->cmtd->dev.parent = &dev->dev;
mtd_set_of_node(info->cmtd, dp);
- part_probe_types = of_get_probes(dp);
- if (!part_probe_types) {
- err = -ENOMEM;
- goto err_out;
- }
- mtd_device_parse_register(info->cmtd, part_probe_types, NULL,
+ mtd_device_parse_register(info->cmtd, part_probe_types_def, NULL,
NULL, 0);
- of_free_probes(part_probe_types);
kfree(mtd_list);
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -29,6 +29,7 @@
#include <linux/kmod.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
+#include <linux/of.h>
#include <linux/err.h>
#include <linux/of.h>
@@ -834,6 +835,37 @@ void deregister_mtd_parser(struct mtd_pa
}
EXPORT_SYMBOL_GPL(deregister_mtd_parser);
+#include <linux/version.h>
+
+/*
+ * Parses the linux,part-probe device tree property.
+ * When a non null value is returned it has to be freed with kfree() by
+ * the caller.
+ */
+static const char * const *of_get_probes(struct device_node *dp)
+{
+ const char **res;
+ int count;
+
+ count = of_property_count_strings(dp, "linux,part-probe");
+ if (count < 0)
+ return NULL;
+
+ res = kzalloc((count + 1) * sizeof(*res), GFP_KERNEL);
+ if (!res)
+ return NULL;
+
+ count = of_property_read_string_array(dp, "linux,part-probe", res,
+ count);
+ if (count < 0)
+ return NULL;
+
+ pr_warn("Support for the generic \"linux,part-probe\" has been deprecated and will be removed soon");
+ BUILD_BUG_ON(LINUX_VERSION_CODE >= KERNEL_VERSION(4, 15, 0));
+
+ return res;
+}
+
/*
* Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you
* are changing this array!
@@ -983,6 +1015,13 @@ int parse_mtd_partitions(struct mtd_info
struct mtd_partitions pparts = { };
struct mtd_part_parser *parser;
int ret, err = 0;
+ const char *const *types_of = NULL;
+
+ if (mtd_get_of_node(master)) {
+ types_of = of_get_probes(mtd_get_of_node(master));
+ if (types_of != NULL)
+ types = types_of;
+ }
if (!types)
types = mtd_is_partition(master) ? default_subpartition_types :
@@ -1024,6 +1063,7 @@ int parse_mtd_partitions(struct mtd_info
if (ret < 0 && !err)
err = ret;
}
+ kfree(types_of);
return err;
}
|
