[PATCH v4 2/2] mtd: spi-nor: enable the debugfs for the partname and partid

[Zhuohao Lee <zhuohao@xxxxxxxxxxxx>]

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@xxxxxxxxxxxx>
---
 drivers/mtd/spi-nor/spi-nor.c | 13 +++++++++++++
 include/linux/mtd/spi-nor.h   |  1 +
 2 files changed, 14 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 6e13bbd1aaa5..c7e57e9a48e5 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -3935,6 +3935,17 @@ static void spi_nor_resume(struct mtd_info *mtd)
 		dev_err(dev, "resume() failed\n");
 }
 
+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;
+	if (!mtd->dbg.partid)
+		mtd->dbg.partid = devm_kasprintf(nor->dev, GFP_KERNEL, "spi-nor:%*phN",
+						 info->id_len, info->id);
+}
+
 void spi_nor_restore(struct spi_nor *nor)
 {
 	/* restore the addressing mode */
@@ -4036,6 +4047,8 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	mtd->_read = spi_nor_read;
 	mtd->_resume = spi_nor_resume;
 
+	spi_nor_debugfs_init(nor, info);
+
 	/* NOR protection support for STmicro/Micron chips and similar */
 	if (JEDEC_MFR(info) == SNOR_MFR_ST ||
 	    JEDEC_MFR(info) == SNOR_MFR_MICRON ||
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index fa2d89e38e40..4ad8b9117659 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -386,6 +386,7 @@ struct spi_nor {
 	u32			flags;
 	u8			cmd_buf[SPI_NOR_MAX_CMD_SIZE];
 	struct spi_nor_erase_map	erase_map;
+	char			*id_string;
 
 	int (*prepare)(struct spi_nor *nor, enum spi_nor_ops ops);
 	void (*unprepare)(struct spi_nor *nor, enum spi_nor_ops ops);
-- 
2.22.0.rc1.257.g3120a18244-goog


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