From dcb9a80359d699cf659c95b9b6e6604e2d68adb9 Mon Sep 17 00:00:00 2001 From: Marek Behún Date: Wed, 26 May 2021 14:08:25 +0200 Subject: mtd: compare also with OF path and device name in get_mtd_device_nm() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The get_mtd_device_nm() function (code imported from Linux) simply iterates all registered MTD devices and compares the given name with all MTDs' names. With SPI_FLASH_MTD enabled U-Boot registers a SPI-NOR as a MTD device with name identical to the SPI flash chip name (from SPI ID table). Thus for a board with multiple same SPI-NORs it registers multiple MTDs, but all with the same name (such as "s25fl164k"). We do not want to change this behaviour, since such a change could break existing boot scripts, which can rely on a hardcoded name. In order to allow somehow to uniqely select a MTD device, change get_mtd_device_nm() function as such: - if first character of name is '/', try interpreting it as OF path - otherwise compare the name with MTDs name and MTDs device name. In the following example a board has two "s25fl164k" SPI-NORs. They both have name "s25fl164k", thus cannot be uniquely selected via this name. With this change, the user can select the second SPI-NOR either with "spi-nor@1" or "/soc/spi@10600/spi-nor@1". Example: => mtd list List of MTD devices: * s25fl164k - device: spi-nor@0 - parent: spi@10600 - driver: jedec_spi_nor - path: /soc/spi@10600/spi-nor@0 - type: NOR flash - block size: 0x1000 bytes - min I/O: 0x1 bytes - 0x000000000000-0x000000800000 : "s25fl164k" * s25fl164k - device: spi-nor@1 - parent: spi@10600 - driver: jedec_spi_nor - path: /soc/spi@10600/spi-nor@1 - type: NOR flash - block size: 0x1000 bytes - min I/O: 0x1 bytes - 0x000000000000-0x000000800000 : "s25fl164k" Signed-off-by: Marek Behún Reviewed-by: Miquel Raynal Tested-by: Patrice Chotard Reviewed-by: Jagan Teki Cc: Priyanka Jain Cc: Simon Glass Cc: Heiko Schocher Cc: Patrick Delaunay --- drivers/mtd/mtdcore.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) (limited to 'drivers/mtd') diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 0d1f94c6cb..582129d0df 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -768,6 +768,32 @@ int __get_mtd_device(struct mtd_info *mtd) } EXPORT_SYMBOL_GPL(__get_mtd_device); +#if CONFIG_IS_ENABLED(DM) && CONFIG_IS_ENABLED(OF_CONTROL) +static bool mtd_device_matches_name(struct mtd_info *mtd, const char *name) +{ + struct udevice *dev = NULL; + bool is_part; + + /* + * If the first character of mtd name is '/', try interpreting as OF + * path. Otherwise try comparing by mtd->name and mtd->dev->name. + */ + if (*name == '/') + device_get_global_by_ofnode(ofnode_path(name), &dev); + + is_part = mtd_is_partition(mtd); + + return (!is_part && dev && mtd->dev == dev) || + !strcmp(name, mtd->name) || + (is_part && mtd->dev && !strcmp(name, mtd->dev->name)); +} +#else +static bool mtd_device_matches_name(struct mtd_info *mtd, const char *name) +{ + return !strcmp(name, mtd->name); +} +#endif + /** * get_mtd_device_nm - obtain a validated handle for an MTD device by * device name @@ -784,10 +810,19 @@ struct mtd_info *get_mtd_device_nm(const char *name) mutex_lock(&mtd_table_mutex); mtd_for_each_device(other) { +#ifdef __UBOOT__ + if (mtd_device_matches_name(other, name)) { + if (mtd) + printf("\nWarning: MTD name \"%s\" is not unique!\n\n", + name); + mtd = other; + } +#else /* !__UBOOT__ */ if (!strcmp(name, other->name)) { mtd = other; break; } +#endif /* !__UBOOT__ */ } if (!mtd) -- cgit v1.2.3