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Date:   Sat, 15 Jul 2023 12:49:18 +0200
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From:   Johan Jonker <jbx6244@gmail.com>
Subject: [PATCH v1 2/2] mtd: rawnand: add nand-skip-bbtscan and
 nand-no-bbm-quirk DT options
To:     miquel.raynal@bootlin.com
Cc:     richard@nod.at, vigneshr@ti.com, robh+dt@kernel.org,
        krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
        linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org
References: <61c84262-cd98-1e60-d95b-9b0492083994@gmail.com>
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A NAND chip can contain a different data format then the MTD framework
expects in the erase blocks for the Bad Block Table(BBT).
Result is a failed probe, while nothing wrong with the hardware.
Some MTD flags need to be set to gain access again.

Skip the automatic BBT scan with the NAND_SKIP_BBTSCAN option
so that the original content is unchanged during the driver probe.
The NAND_NO_BBM_QUIRK option allows us to erase bad blocks with
the nand_erase_nand() function and the flash_erase command.

Add nand-skip-bbtscan and nand-no-bbm-quirk Device Tree options,
so the user has the "freedom of choice" by neutral
access mode to read and write in whatever format is needed.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
---

Previous discussion:
[PATCH v3 3/3] mtd: rawnand: rockchip-nand-controller: add skipbbt option
https://lore.kernel.org/linux-mtd/1618382560.2326931.1689261435022.JavaMail.zimbra@nod.at/
---
 drivers/mtd/nand/raw/nand_base.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index a6af521832aa..f0fa5c3519b1 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -5521,6 +5521,12 @@ static int rawnand_dt_init(struct nand_chip *chip)
 	if (of_property_read_bool(dn, "nand-is-boot-medium"))
 		chip->options |= NAND_IS_BOOT_MEDIUM;

+	if (of_property_read_bool(dn, "nand-no-bbm-quirk"))
+		chip->options |= NAND_NO_BBM_QUIRK;
+
+	if (of_property_read_bool(dn, "nand-skip-bbtscan"))
+		chip->options |= NAND_SKIP_BBTSCAN;
+
 	if (of_property_read_bool(dn, "nand-on-flash-bbt"))
 		chip->bbt_options |= NAND_BBT_USE_FLASH;

--
2.30.2