From d7f7e04f8b67571a4bf5a0dcd4f9da4214f5262c Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Sun, 18 Apr 2021 23:46:15 +0200
Subject: mtd: parsers: trx: Allow to specify brcm, trx-magic in DT

Buffalo uses a different TRX magic for every device, to be able to use
this trx parser, make it possible to specify the TRX magic in device
tree. If no TRX magic is specified in device tree, the standard value
will be used. This value should only be specified if a vendor chooses to
use a non standard TRX magic.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210418214616.239574-3-hauke@hauke-m.de
---
 drivers/mtd/parsers/parser_trx.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/drivers/mtd/parsers/parser_trx.c
+++ b/drivers/mtd/parsers/parser_trx.c
@@ -78,13 +78,20 @@ static int parser_trx_parse(struct mtd_i
 			    const struct mtd_partition **pparts,
 			    struct mtd_part_parser_data *data)
 {
+	struct device_node *np = mtd_get_of_node(mtd);
 	struct mtd_partition *parts;
 	struct mtd_partition *part;
 	struct trx_header trx;
 	size_t bytes_read;
 	uint8_t curr_part = 0, i = 0;
+	uint32_t trx_magic = TRX_MAGIC;
 	int err;
 
+	/* Get different magic from device tree if specified */
+	err = of_property_read_u32(np, "brcm,trx-magic", &trx_magic);
+	if (err != 0 && err != -EINVAL)
+		pr_err("failed to parse \"brcm,trx-magic\" DT attribute, using default: %d\n", err);
+
 	parts = kcalloc(TRX_PARSER_MAX_PARTS, sizeof(struct mtd_partition),
 			GFP_KERNEL);
 	if (!parts)
@@ -97,7 +104,7 @@ static int parser_trx_parse(struct mtd_i
 		return err;
 	}
 
-	if (trx.magic != TRX_MAGIC) {
+	if (trx.magic != trx_magic) {
 		kfree(parts);
 		return -ENOENT;
 	}
