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

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Message-ID: <8d72820d-bbaa-abc8-4448-87f0f054c381@linaro.org>
Date:   Tue, 19 Sep 2023 19:12:24 +0300
From:   Tudor Ambarus <tudor.ambarus@...aro.org>
To:     nicolas.ferre@...rochip.com, miquel.raynal@...tlin.com,
        linux-mtd@...ts.infradead.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: spi-nor: atmel: add at25ff321a entry



On 08.09.2023 18:14, nicolas.ferre@...rochip.com wrote:
> From: Nicolas Ferre <nicolas.ferre@...rochip.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@...rochip.com>
> ---
> Hi,
> 

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@...a7g5ek-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@...a7g5ek-sd:~# mtd_debug write /dev/mtd0 0 3145728 spi_test 
> Copied 3145728 bytes from spi_test to address 0x00000000 in flash
> root@...a7g5ek-sd:~# mtd_debug erase /dev/mtd0 0 3145728 
> Erased 3145728 bytes from address 0x00000000 in flash
> root@...a7g5ek-sd:~# mtd_debug read /dev/mtd0 0 3145728 spi_read 
> Copied 3145728 bytes from address 0x00000000 in flash to spi_read
> root@...a7g5ek-sd:~# hexdump spi_read 
> 0000000 ffff ffff ffff ffff ffff ffff ffff ffff
> *
> 0300000
> root@...a7g5ek-sd:~# mtd_debug write /dev/mtd0 0 3145728 spi_test 
>  Copied 3145728 bytes from spi_test to address 0x00000000 in flash
> root@...a7g5ek-sd:~# mtd_debug read /dev/mtd0 0 3145728 spi_read 
> Copied 3145728 bytes from address 0x00000000 in flash to spi_read
> root@...a7g5ek-sd:~# sha1sum spi_test spi_read 
> 06d5459972d51a2ff4270e612270c6519e797a0b  spi_test
> 06d5459972d51a2ff4270e612270c6519e797a0b  spi_read
> 
> Here are the data from sysfs:
> 
> root@...a7g5ek-sd:~#  cat /sys/bus/spi/devices/spi0.0/spi-nor/partname
> at25ff321a
> root@...a7g5ek-sd:~# cat /sys/bus/spi/devices/spi0.0/spi-nor/jedec_id
> 1f4708
> root@...a7g5ek-sd:~# cat /sys/bus/spi/devices/spi0.0/spi-nor/manufacturer
> atmel
> root@...a7g5ek-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  |. ......@....;..|
> 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@...a7g5ek-sd:~# md5sum /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
> d540f07cbfb7c9c19654c453b561b311  /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
> 

Wonderful, thanks Nicolas!

> 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 },

We have recently changed how the flash entries are defined. Would you
please try the following changes instead?

diff --git a/drivers/mtd/spi-nor/atmel.c b/drivers/mtd/spi-nor/atmel.c
index 95f0e139284e..44218716d81e 100644
--- a/drivers/mtd/spi-nor/atmel.c
+++ b/drivers/mtd/spi-nor/atmel.c
@@ -213,6 +213,12 @@ 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
+       }, {
+               .id = SNOR_ID(0x1f, 0x47, 0x08),
+               .name = "at25ff321a",
+               .flags = SPI_NOR_HAS_LOCK | SPI_NOR_SWP_IS_VOLATILE,
+               .fixups = &atmel_nor_global_protection_fixups
+       }, {
        }, {
                .id = SNOR_ID(0x1f, 0x48, 0x00),
                .name = "at25df641",