[PATCH v4 1/8] mtd: nand: raw: rockchip_nfc: add NAND_SKIP_BBTSCAN option

[Johan Jonker]

On Rockchip SoCs the first boot stages are written on NAND
with help of manufacturer software that uses a different format
then the MTD framework. Skip the automatic BBT scan with the
NAND_SKIP_BBTSCAN option to be able to pass the driver probe
function and to let the original data unchanged.

Signed-off-by: Johan Jonker <jbx6244 at gmail.com>
Reviewed-by: Kever Yang <kever.yang at rock-chips.com>
---
 drivers/mtd/nand/raw/Kconfig        | 9 +++++++++
 drivers/mtd/nand/raw/rockchip_nfc.c | 3 +++
 2 files changed, 12 insertions(+)

diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index d624589a892b..72547f00fbec 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -611,6 +611,15 @@ config ROCKCHIP_NAND
 	    NFC v800: RK3308, RV1108
 	    NFC v900: PX30, RK3326

+config ROCKCHIP_NAND_SKIP_BBTSCAN
+	bool "Skip the automatic BBT scan with Rockchip NAND controllers"
+	depends on ROCKCHIP_NAND
+	default n
+	help
+	  Skip the automatic BBT scan with the NAND_SKIP_BBTSCAN
+	  option when data content is not in MTD format or
+	  must remain unchanged.
+
 config TEGRA_NAND
 	bool "Support for NAND controller on Tegra SoCs"
 	depends on ARCH_TEGRA
diff --git a/drivers/mtd/nand/raw/rockchip_nfc.c b/drivers/mtd/nand/raw/rockchip_nfc.c
index 6ad51df4acff..df6742c2f9bb 100644
--- a/drivers/mtd/nand/raw/rockchip_nfc.c
+++ b/drivers/mtd/nand/raw/rockchip_nfc.c
@@ -981,6 +981,9 @@ static int rk_nfc_nand_chip_init(ofnode node, struct rk_nfc *nfc, int devnum)
 	chip->bbt_options = NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB;
 	chip->options |= NAND_NO_SUBPAGE_WRITE | NAND_USE_BOUNCE_BUFFER;

+	if (IS_ENABLED(CONFIG_ROCKCHIP_NAND_SKIP_BBTSCAN))
+		chip->options |= NAND_SKIP_BBTSCAN;
+
 	rk_nfc_hw_init(nfc);
 	ret = nand_scan_ident(mtd, nsels, NULL);
 	if (ret)
--
2.39.2