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Subject[PATCH 2/2] mtd: rawnand: Rework of_get_nand_bus_width()
Date
of_get_nand_bus_width() had a wrong behavior because:
1/ it ignored the -ENODATA and -EOVERFLOW return values of
of_property_read_u32(). "nand-bus-width" without value was tolerated
while it shouldn't have been according to the devicetree bindings.
2/ returned -EIO when the nand-bus-width was neither 8 nor 16, when it
should have returned -EINVAL instead.
3/ returned the 8 or 16 bus-width integer, but it was never used it its
caller. A simply return 0 on success is enough.
Rework of_get_nand_bus_width() and address all the above. The execution
is now stopped in case of errors.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
---
drivers/mtd/nand/raw/nand_base.c | 30 ++++++++++++++++++------------
1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index b8e7f1aae032..54153d7aa671 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -5271,20 +5271,24 @@ static void of_get_nand_ecc_legacy_user_config(struct nand_chip *chip)
user_conf->placement = of_get_rawnand_ecc_placement_legacy(dn);
}

-static int of_get_nand_bus_width(struct device_node *np)
+static int of_get_nand_bus_width(struct nand_chip *chip)
{
+ struct device_node *dn = nand_get_flash_node(chip);
u32 val;
+ int ret;

- if (of_property_read_u32(np, "nand-bus-width", &val))
- return 8;
+ ret = of_property_read_u32(dn, "nand-bus-width", &val);
+ if (ret == -EINVAL)
+ /* Buswidth defaults to 8 if the property does not exist .*/
+ return 0;
+ else if (ret)
+ return ret;

- switch (val) {
- case 8:
- case 16:
- return val;
- default:
- return -EIO;
- }
+ if (val == 16)
+ chip->options |= NAND_BUSWIDTH_16;
+ else if (val != 8)
+ return -EINVAL;
+ return 0;
}

static int of_get_nand_secure_regions(struct nand_chip *chip)
@@ -5360,12 +5364,14 @@ static int rawnand_dt_init(struct nand_chip *chip)
{
struct nand_device *nand = mtd_to_nanddev(nand_to_mtd(chip));
struct device_node *dn = nand_get_flash_node(chip);
+ int ret;

if (!dn)
return 0;

- if (of_get_nand_bus_width(dn) == 16)
- chip->options |= NAND_BUSWIDTH_16;
+ ret = of_get_nand_bus_width(chip);
+ if (ret)
+ return ret;

if (of_property_read_bool(dn, "nand-is-boot-medium"))
chip->options |= NAND_IS_BOOT_MEDIUM;
--
2.25.1
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