From 3f86f14c0fc9fdb0984e64209df2f47895a07151 Mon Sep 17 00:00:00 2001 From: David Brownell Date: Tue, 4 Dec 2007 23:45:10 -0800 Subject: [PATCH] spi: at25 driver is for EEPROM not FLASH Add comment to at25 driver that it's for EEPROM chips, not FLASH chips ... the AT25 series has both types of chip, and sometimes they're even pin-compatible. The command sets are different, as is the treatment of erasure. (FLASH needs explicit erasure, but with EEPROM it's implicit.) Note that all vendors seem to have this same confusion in their *25* series SPI memory parts. Signed-off-by: David Brownell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/spi/at25.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/spi/at25.c b/drivers/spi/at25.c index e007833cca59..290dbe99647a 100644 --- a/drivers/spi/at25.c +++ b/drivers/spi/at25.c @@ -21,6 +21,13 @@ #include +/* + * NOTE: this is an *EEPROM* driver. The vagaries of product naming + * mean that some AT25 products are EEPROMs, and others are FLASH. + * Handle FLASH chips with the drivers/mtd/devices/m25p80.c driver, + * not this one! + */ + struct at25_data { struct spi_device *spi; struct mutex lock;