From 173b0add0cff6558f950c0cb1eacfb729d482711 Mon Sep 17 00:00:00 2001 From: Hauke Mehrtens Date: Sun, 17 May 2015 18:48:38 +0200 Subject: [PATCH 4/8] 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. Signed-off-by: Hauke Mehrtens --- Documentation/devicetree/bindings/mtd/nand.txt | 16 ++++++++++ drivers/mtd/maps/physmap_of.c | 40 +----------------------- drivers/mtd/mtdpart.c | 43 ++++++++++++++++++++++++++ 3 files changed, 60 insertions(+), 39 deletions(-) --- a/Documentation/devicetree/bindings/mtd/nand.txt +++ b/Documentation/devicetree/bindings/mtd/nand.txt @@ -12,6 +12,22 @@ - nand-ecc-step-size: integer representing the number of data bytes that are covered by a single ECC step. +- 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.c +++ b/drivers/mtd/maps/physmap_of.c @@ -112,45 +112,9 @@ 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 *cp; - int cplen; - unsigned int l; - unsigned int count; - const char **res; - - cp = of_get_property(dp, "linux,part-probe", &cplen); - if (cp == NULL) - return part_probe_types_def; - - count = 0; - for (l = 0; l != cplen; l++) - if (cp[l] == 0) - count++; - - res = kzalloc((count + 1)*sizeof(*res), GFP_KERNEL); - count = 0; - while (cplen > 0) { - res[count] = cp; - l = strlen(cp) + 1; - cp += l; - cplen -= l; - count++; - } - return res; -} - -static void of_free_probes(const char * const *probes) -{ - if (probes != part_probe_types_def) - kfree(probes); -} - static 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; @@ -310,10 +274,8 @@ static int of_flash_probe(struct platfor goto err_out; ppdata.of_node = dp; - part_probe_types = of_get_probes(dp); - mtd_device_parse_register(info->cmtd, part_probe_types, &ppdata, + mtd_device_parse_register(info->cmtd, part_probe_types_def, &ppdata, 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 #include #include +#include #include #include @@ -719,6 +720,40 @@ void deregister_mtd_parser(struct mtd_pa EXPORT_SYMBOL_GPL(deregister_mtd_parser); /* + * 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 *cp; + int cplen; + unsigned int l; + unsigned int count; + const char **res; + + cp = of_get_property(dp, "linux,part-probe", &cplen); + if (cp == NULL) + return NULL; + + count = 0; + for (l = 0; l != cplen; l++) + if (cp[l] == 0) + count++; + + res = kzalloc((count + 1) * sizeof(*res), GFP_KERNEL); + count = 0; + while (cplen > 0) { + res[count] = cp; + l = strlen(cp) + 1; + cp += l; + cplen -= l; + count++; + } + return res; +} + +/* * Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you * are changing this array! */ @@ -754,6 +789,13 @@ int parse_mtd_partitions(struct mtd_info { struct mtd_part_parser *parser; int ret = 0; + const char *const *types_of = NULL; + + if (data && data->of_node) { + types_of = of_get_probes(data->of_node); + if (types_of != NULL) + types = types_of; + } if (!types) types = default_mtd_part_types; @@ -772,6 +814,7 @@ int parse_mtd_partitions(struct mtd_info break; } } + kfree(types_of); return ret; }