linux-kernel - [PATCH v3 2/9] mtd: spi-nor: Introduce spi_nor_match

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Date:   Mon, 11 Apr 2022 12:10:26 +0300
From:   Tudor Ambarus <tudor.ambarus@...rochip.com>
To:     <p.yadav@...com>, <michael@...le.cc>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <nicolas.ferre@...rochip.com>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>
Subject: [PATCH v3 2/9] mtd: spi-nor: Introduce spi_nor_match_id()

Similar to spi_nor_match_name() extend the search of flash_info through
all the manufacturers, this time doing the match by ID. There's no reason
to limit the search per manufacturer yet, do it globally, search the flash
in all the parts of all manufacturers in a single method.

Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
Reviewed-by: Pratyush Yadav <p.yadav@...com>
Reviewed-by: Michael Walle <michael@...le.cc>
---
v3: collect R-bs

 drivers/mtd/spi-nor/core.c | 40 ++++++++++++++++++--------------------
 1 file changed, 19 insertions(+), 21 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 214d3a1ac6b0..b9cc8bbf1f62 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -1629,16 +1629,21 @@ static const struct spi_nor_manufacturer *manufacturers[] = {
 	&spi_nor_xmc,
 };
 
-static const struct flash_info *
-spi_nor_search_part_by_id(const struct flash_info *parts, unsigned int nparts,
-			  const u8 *id)
+static const struct flash_info *spi_nor_match_id(struct spi_nor *nor,
+						 const u8 *id)
 {
-	unsigned int i;
+	const struct flash_info *part;
+	unsigned int i, j;
 
-	for (i = 0; i < nparts; i++) {
-		if (parts[i].id_len &&
-		    !memcmp(parts[i].id, id, parts[i].id_len))
-			return &parts[i];
+	for (i = 0; i < ARRAY_SIZE(manufacturers); i++) {
+		for (j = 0; j < manufacturers[i]->nparts; j++) {
+			part = &manufacturers[i]->parts[j];
+			if (part->id_len &&
+			    !memcmp(part->id, id, part->id_len)) {
+				nor->manufacturer = manufacturers[i];
+				return part;
+			}
+		}
 	}
 
 	return NULL;
@@ -1648,7 +1653,6 @@ static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
 {
 	const struct flash_info *info;
 	u8 *id = nor->bouncebuf;
-	unsigned int i;
 	int ret;
 
 	if (nor->spimem) {
@@ -1668,19 +1672,13 @@ static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
 		return ERR_PTR(ret);
 	}
 
-	for (i = 0; i < ARRAY_SIZE(manufacturers); i++) {
-		info = spi_nor_search_part_by_id(manufacturers[i]->parts,
-						 manufacturers[i]->nparts,
-						 id);
-		if (info) {
-			nor->manufacturer = manufacturers[i];
-			return info;
-		}
+	info = spi_nor_match_id(nor, id);
+	if (!info) {
+		dev_err(nor->dev, "unrecognized JEDEC id bytes: %*ph\n",
+			SPI_NOR_MAX_ID_LEN, id);
+		return ERR_PTR(-ENODEV);
 	}
-
-	dev_err(nor->dev, "unrecognized JEDEC id bytes: %*ph\n",
-		SPI_NOR_MAX_ID_LEN, id);
-	return ERR_PTR(-ENODEV);
+	return info;
 }
 
 static int spi_nor_read(struct mtd_info *mtd, loff_t from, size_t len,
-- 
2.25.1