From 7ce4f1fad28e538d216065b5042f6f20a5f50a90 Mon Sep 17 00:00:00 2001 From: Christophe Kerello Date: Tue, 22 Feb 2022 17:38:49 +0100 Subject: [PATCH] mtd: rawnand: stm32_fmc2: add NAND Write Protect support This patch adds the support of the WP# signal. WP will be disabled before the first access to the NAND flash. Signed-off-by: Christophe Kerello Reviewed-by: Patrice Chotard --- drivers/mtd/nand/raw/stm32_fmc2_nand.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c index eee6594..fb3279b 100644 --- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c +++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include @@ -149,6 +150,7 @@ struct stm32_fmc2_timings { struct stm32_fmc2_nand { struct nand_chip chip; struct stm32_fmc2_timings timings; + struct gpio_desc wp_gpio; int ncs; int cs_used[FMC2_MAX_CE]; }; @@ -824,6 +826,9 @@ static int stm32_fmc2_nfc_parse_child(struct stm32_fmc2_nfc *nfc, ofnode node) nand->cs_used[i] = cs[i]; } + gpio_request_by_name_nodev(node, "wp-gpios", 0, &nand->wp_gpio, + GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE); + nand->chip.flash_node = node; return 0; @@ -972,6 +977,10 @@ static int stm32_fmc2_nfc_probe(struct udevice *dev) chip->ecc.size = FMC2_ECC_STEP_SIZE; chip->ecc.strength = FMC2_ECC_BCH8; + /* Disable Write Protect */ + if (dm_gpio_is_valid(&nand->wp_gpio)) + dm_gpio_set_value(&nand->wp_gpio, 0); + ret = nand_scan_ident(mtd, nand->ncs, NULL); if (ret) return ret; -- 2.7.4