From eb7f9115409710732ebc4dfe1be629252280910e Mon Sep 17 00:00:00 2001 From: Boris BREZILLON Date: Mon, 28 Jul 2014 14:47:04 +0200 Subject: [PATCH] of: mtd: Add NAND randomizer mode retrieval Add a of_get_nand_rnd_mode() helper function. Signed-off-by: Boris BREZILLON Signed-off-by: Hans de Goede --- drivers/of/of_mtd.c | 35 +++++++++++++++++++++++++++++++++++ include/linux/of_mtd.h | 6 ++++++ 2 files changed, 41 insertions(+) --- a/drivers/of/of_mtd.c +++ b/drivers/of/of_mtd.c @@ -84,6 +84,41 @@ int of_get_nand_ecc_strength(struct devi EXPORT_SYMBOL_GPL(of_get_nand_ecc_strength); /** + * It maps 'enum nand_rnd_modes_t' found in include/linux/mtd/nand.h + * into the device tree binding of 'nand-rnd', so that MTD + * device driver can get nand rnd from device tree. + */ +static const char *nand_rnd_modes[] = { + [NAND_RND_NONE] = "none", + [NAND_RND_SOFT] = "soft", + [NAND_RND_HW] = "hw", +}; + +/** + * of_get_nand_rnd_mode - Get nand randomizer mode for given device_node + * @np: Pointer to the given device_node + * + * The function gets randomizer mode string from property 'nand-rnd-mode', + * and return its index in nand_rnd_modes table, or errno in error case. + */ +int of_get_nand_rnd_mode(struct device_node *np) +{ + const char *pm; + int err, i; + + err = of_property_read_string(np, "nand-rnd-mode", &pm); + if (err < 0) + return err; + + for (i = 0; i < ARRAY_SIZE(nand_rnd_modes); i++) + if (!strcasecmp(pm, nand_rnd_modes[i])) + return i; + + return -ENODEV; +} +EXPORT_SYMBOL_GPL(of_get_nand_rnd_mode); + +/** * of_get_nand_bus_width - Get nand bus witdh for given device_node * @np: Pointer to the given device_node * --- a/include/linux/of_mtd.h +++ b/include/linux/of_mtd.h @@ -15,6 +15,7 @@ int of_get_nand_ecc_mode(struct device_node *np); int of_get_nand_ecc_step_size(struct device_node *np); int of_get_nand_ecc_strength(struct device_node *np); +int of_get_nand_rnd_mode(struct device_node *np); int of_get_nand_bus_width(struct device_node *np); bool of_get_nand_on_flash_bbt(struct device_node *np); @@ -34,6 +35,11 @@ static inline int of_get_nand_ecc_streng { return -ENOSYS; } + +static inline int of_get_nand_rnd_mode(struct device_node *np) +{ + return -ENOSYS; +} static inline int of_get_nand_bus_width(struct device_node *np) {