From: Rafał Miłecki <zajec5@gmail.com>
Date: Mon, 1 Dec 2014 08:42:16 +0000 (+0100)
Subject: mtd: spi-nor: allow NULL as chip name and try to auto detect it
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=58c81957b7d284c57a9fc1b815c77155ef744ea5;p=linux-beck.git

mtd: spi-nor: allow NULL as chip name and try to auto detect it

This will allow spi-nor users to plainly use JEDEC to detect flash chip.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
---

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 0f4f2ba16e3e..0f8ec3c2d015 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -938,13 +938,21 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
 	if (ret)
 		return ret;
 
-	id = spi_nor_match_id(name);
-	if (!id)
+	/* Try to auto-detect if chip name wasn't specified */
+	if (!name)
+		id = spi_nor_read_id(nor);
+	else
+		id = spi_nor_match_id(name);
+	if (IS_ERR_OR_NULL(id))
 		return -ENOENT;
 
 	info = (void *)id->driver_data;
 
-	if (info->id_len) {
+	/*
+	 * If caller has specified name of flash model that can normally be
+	 * detected using JEDEC, let's verify it.
+	 */
+	if (name && info->id_len) {
 		const struct spi_device_id *jid;
 
 		jid = spi_nor_read_id(nor);