From: Zhuohao Lee <zhuohao@chromium.org>
Date: Wed, 28 Aug 2019 09:08:02 +0300
Subject: mtd: spi-nor: enable the debugfs for the partname and partid
Git-commit: dcc935b06f1f29aa9f93008df3d13ab84ab0bbbb
Patch-mainline: v5.4-rc1
References: jsc#SLE-14214 jsc#SLE-16606

This patch adds spi_nor_debugfs_init() for the debugfs initialization.
With this patch, we can read the partname and partid through the
debugfs.

The output of new debugfs nodes on my device are:
cat /sys/kernel/debug/mtd/mtd0/partid
spi-nor:ef6017
cat /sys/kernel/debug/mtd/mtd0/partname
w25q64dw

Signed-off-by: Zhuohao Lee <zhuohao@chromium.org>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
---
 drivers/mtd/spi-nor/spi-nor.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 79c8f1dd8c6b..6a2fff0598af 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -4767,6 +4767,16 @@ static int spi_nor_set_addr_width(struct spi_nor *nor)
 	return 0;
 }
 
+static void spi_nor_debugfs_init(struct spi_nor *nor,
+				 const struct flash_info *info)
+{
+	struct mtd_info *mtd = &nor->mtd;
+
+	mtd->dbg.partname = info->name;
+	mtd->dbg.partid = devm_kasprintf(nor->dev, GFP_KERNEL, "spi-nor:%*phN",
+					 info->id_len, info->id);
+}
+
 static const struct flash_info *spi_nor_get_flash_info(struct spi_nor *nor,
 						       const char *name)
 {
@@ -4847,6 +4857,8 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 
 	nor->info = info;
 
+	spi_nor_debugfs_init(nor, info);
+
 	mutex_init(&nor->lock);
 
 	/*
-- 
2.28.0