[PATCH v2 6/7] mtd: rawnand: brcmnand: Support write protection setting from dts

[Linus Walleij]

From: William Zhang <william.zhang at broadcom.com>

Backport of upstream Linux
commit 8e7daa85641c9559c113f6b217bdc923397de77c
"mtd: rawnand: brcmnand: Support write protection setting from dts"

Augmented to also support the "write-protect" boolean property.

The write protection feature is controlled by the module parameter wp_on
with default set to enabled. But not all the board use this feature
especially in BCMBCA broadband board. And module parameter is not
sufficient as different board can have different option.  Add a device
tree property and allow this feature to be configured through the board
dts on per board basis.

Signed-off-by: William Zhang <william.zhang at broadcom.com>
Reviewed-by: Florian Fainelli <florian.fainelli at broadcom.com>
Reviewed-by: Kamal Dasu <kamal.dasu at broadcom.com>
Reviewed-by: David Regan <dregan at broadcom.com>
Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20240223034758.13753-14-william.zhang@broadcom.com
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
---
 drivers/mtd/nand/raw/brcmnand/brcmnand.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
index 2f786584a1ae..071b33951648 100644
--- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
@@ -2844,8 +2844,17 @@ int brcmnand_probe(struct udevice *dev, struct brcmnand_soc *soc)
 	/* Disable XOR addressing */
 	brcmnand_rmw_reg(ctrl, BRCMNAND_CS_XOR, 0xff, 0, 0);
 
+	/* Check if the board connects the WP pin */
+#ifndef __UBOOT__
+	if (of_property_read_bool(dn, "brcm,wp-not-connected"))
+#else
+	if (dev_read_bool(ctrl->dev, "brcm,wp-not-connected"))
+#endif /* __UBOOT__ */
+		wp_on = 0;
+
 	/* Read the write-protect configuration in the device tree */
-	wp_on = dev_read_u32_default(dev, "write-protect", wp_on);
+	if (dev_read_bool(ctrl->dev, "write-protect"))
+		wp_on = dev_read_u32_default(dev, "write-protect", wp_on);
 
 	if (ctrl->features & BRCMNAND_HAS_WP) {
 		/* Permanently disable write protection */

-- 
2.46.0