[PATCH] mtd: spi-nor: atmel: add at25ff321a entry

[<nicolas.ferre@microchip.com>]

From: Nicolas Ferre <nicolas.ferre@microchip.com>

Add the at25ff321a 4MB SPI flash which is able to provide
SFDP informations.
Datasheet: https://www.renesas.com/us/en/document/dst/at25ff321a-datasheet

Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
---
Hi,

This flash is present on the MikoE flash 10 Click board and was tested on
sama7g5-ek at spi frequency of 80 MHz:

Here is the test I ran:
root@sama7g5ek-sd:~# dd if=/dev/urandom of=./spi_test bs=1M count=3 
3+0 records in
3+0 records out
3145728 bytes (3.1 MB, 3.0 MiB) copied, 0.932896 s, 3.4 MB/s
root@sama7g5ek-sd:~# mtd_debug write /dev/mtd0 0 3145728 spi_test 
Copied 3145728 bytes from spi_test to address 0x00000000 in flash
root@sama7g5ek-sd:~# mtd_debug erase /dev/mtd0 0 3145728 
Erased 3145728 bytes from address 0x00000000 in flash
root@sama7g5ek-sd:~# mtd_debug read /dev/mtd0 0 3145728 spi_read 
Copied 3145728 bytes from address 0x00000000 in flash to spi_read
root@sama7g5ek-sd:~# hexdump spi_read 
0000000 ffff ffff ffff ffff ffff ffff ffff ffff
*
0300000
root@sama7g5ek-sd:~# mtd_debug write /dev/mtd0 0 3145728 spi_test 
 Copied 3145728 bytes from spi_test to address 0x00000000 in flash
root@sama7g5ek-sd:~# mtd_debug read /dev/mtd0 0 3145728 spi_read 
Copied 3145728 bytes from address 0x00000000 in flash to spi_read
root@sama7g5ek-sd:~# sha1sum spi_test spi_read 
06d5459972d51a2ff4270e612270c6519e797a0b  spi_test
06d5459972d51a2ff4270e612270c6519e797a0b  spi_read

Here are the data from sysfs:

root@sama7g5ek-sd:~#  cat /sys/bus/spi/devices/spi0.0/spi-nor/partname
at25ff321a
root@sama7g5ek-sd:~# cat /sys/bus/spi/devices/spi0.0/spi-nor/jedec_id
1f4708
root@sama7g5ek-sd:~# cat /sys/bus/spi/devices/spi0.0/spi-nor/manufacturer
atmel
root@sama7g5ek-sd:~# hexdump -C /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
00000000  53 46 44 50 06 01 00 ff  00 06 01 10 10 00 00 ff  |SFDP............|
00000010  e5 20 e1 ff ff ff ff 01  40 eb 08 6b 08 3b 00 ff  |. ......@..k.;..|
00000020  ee ff ff ff ff ff 00 ff  ff ff 00 ff 0c 20 0f 52  |............. .R|
00000030  10 d8 00 ff 50 2a 2a 01  82 ff 9c d2 64 c1 08 46  |....P**.....d..F|
00000040  7a 75 7a 75 f7 c4 d5 5c  00 06 51 ff 88 30 00 00  |zuzu...\..Q..0..|
00000050
root@sama7g5ek-sd:~# md5sum /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
d540f07cbfb7c9c19654c453b561b311  /sys/bus/spi/devices/spi0.0/spi-nor/sfdp

Best regards,
  Nicolas

 drivers/mtd/spi-nor/atmel.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mtd/spi-nor/atmel.c b/drivers/mtd/spi-nor/atmel.c
index 58968c1e7d2f..c94d52951481 100644
--- a/drivers/mtd/spi-nor/atmel.c
+++ b/drivers/mtd/spi-nor/atmel.c
@@ -184,6 +184,10 @@ static const struct flash_info atmel_nor_parts[] = {
 		FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
 		NO_SFDP_FLAGS(SECT_4K)
 		.fixups = &atmel_nor_global_protection_fixups },
+	{ "at25ff321a", INFO(0x1f4708, 0, 64 * 1024,  64)
+		FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
+		PARSE_SFDP
+		.fixups = &atmel_nor_global_protection_fixups },
 	{ "at25df641",  INFO(0x1f4800, 0, 64 * 1024, 128)
 		FLAGS(SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE)
 		NO_SFDP_FLAGS(SECT_4K)
-- 
2.39.2