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

   1 From 8e7daa85641c9559c113f6b217bdc923397de77c Mon Sep 17 00:00:00 2001
   2 From: William Zhang <william.zhang@broadcom.com>
   3 Date: Thu, 22 Feb 2024 19:47:58 -0800
   4 Subject: [PATCH] mtd: rawnand: brcmnand: Support write protection setting from
   5  dts
   6
   7 The write protection feature is controlled by the module parameter wp_on
   8 with default set to enabled. But not all the board use this feature
   9 especially in BCMBCA broadband board. And module parameter is not
  10 sufficient as different board can have different option.  Add a device
  11 tree property and allow this feature to be configured through the board
  12 dts on per board basis.
  13
  14 Signed-off-by: William Zhang <william.zhang@broadcom.com>
  15 Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
  16 Reviewed-by: Kamal Dasu <kamal.dasu@broadcom.com>
  17 Reviewed-by: David Regan <dregan@broadcom.com>
  18 Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
  19 Link: https://lore.kernel.org/linux-mtd/20240223034758.13753-14-william.zhang@broadcom.com
  20 ---
  21  drivers/mtd/nand/raw/brcmnand/brcmnand.c | 4 ++++
  22  1 file changed, 4 insertions(+)
  23
  24 --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
  25 +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
  26 @@ -3184,6 +3184,10 @@ int brcmnand_probe(struct platform_devic
  27         /* Disable XOR addressing */
  28         brcmnand_rmw_reg(ctrl, BRCMNAND_CS_XOR, 0xff, 0, 0);
  29
  30 +       /* Check if the board connects the WP pin */
  31 +       if (of_property_read_bool(dn, "brcm,wp-not-connected"))
  32 +               wp_on = 0;
  33 +
  34         if (ctrl->features & BRCMNAND_HAS_WP) {
  35                 /* Permanently disable write protection */
  36                 if (wp_on == 2)