kernel: backport brcmnand support for "brcm,wp-not-connected"

[openwrt/openwrt.git] / target / linux / generic / backport-5.15 / 411-v6.9-mtd-rawnand-brcmnand-Support-write-protection-settin.patch

diff --git a/target/linux/generic/backport-5.15/411-v6.9-mtd-rawnand-brcmnand-Support-write-protection-settin.patch b/target/linux/generic/backport-5.15/411-v6.9-mtd-rawnand-brcmnand-Support-write-protection-settin.patch
new file mode 100644 (file)
index 0000000..dce2c91
--- /dev/null
+++ b/target/linux/generic/backport-5.15/411-v6.9-mtd-rawnand-brcmnand-Support-write-protection-settin.patch
@@ -0,0 +1,36 @@
+From 8e7daa85641c9559c113f6b217bdc923397de77c Mon Sep 17 00:00:00 2001
+From: William Zhang <william.zhang@broadcom.com>
+Date: Thu, 22 Feb 2024 19:47:58 -0800
+Subject: [PATCH] mtd: rawnand: brcmnand: Support write protection setting from
+ dts
+
+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@broadcom.com>
+Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
+Reviewed-by: Kamal Dasu <kamal.dasu@broadcom.com>
+Reviewed-by: David Regan <dregan@broadcom.com>
+Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
+Link: https://lore.kernel.org/linux-mtd/20240223034758.13753-14-william.zhang@broadcom.com
+---
+ drivers/mtd/nand/raw/brcmnand/brcmnand.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+--- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
++++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
+@@ -3184,6 +3184,10 @@ int brcmnand_probe(struct platform_devic
+       /* Disable XOR addressing */
+       brcmnand_rmw_reg(ctrl, BRCMNAND_CS_XOR, 0xff, 0, 0);
+ 
++      /* Check if the board connects the WP pin */
++      if (of_property_read_bool(dn, "brcm,wp-not-connected"))
++              wp_on = 0;
++
+       if (ctrl->features & BRCMNAND_HAS_WP) {
+               /* Permanently disable write protection */
+               if (wp_on == 2)