[PATCH v5 2/2] mtd: spi-nor: enable the debugfs for the partname and partid

Zhuohao Lee zhuohao at chromium.org
Sun Jun 2 20:14:51 PDT 2019


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 at chromium.org>
---
 drivers/mtd/spi-nor/spi-nor.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 6e13bbd1aaa5..acc1915b380b 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -3935,6 +3935,18 @@ 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 +4048,8 @@ 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 ||
-- 
2.22.0.rc1.311.g5d7573a151-goog




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