[PATCH] mtd: spi-nor: issi: Add support for ISSI IS25LP512MG

[PATCH] mtd: spi-nor: issi: Add support for ISSI IS25LP512MG

[Matthew Parker]

Add support for the ISSI IS25LP512MG 512Mbit (64 MiB) SPI NOR flash.

The device provides JESD216B SFDP tables which accurately describe
fast-read modes and erase geometry. Flash read, write, and erase
operations across the full 64 MiB array have been verified on hardware.

Cc: stable@vger.kernel.org # v6.1+
Co-developed-by: Adam Calabrigo <adamc@arista.com>
Signed-off-by: Adam Calabrigo <adamc@arista.com>
Signed-off-by: Matthew Parker <mparker@arista.com>
---
 drivers/mtd/spi-nor/issi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mtd/spi-nor/issi.c b/drivers/mtd/spi-nor/issi.c
index 2f057d731df2..977dc5ba8028 100644
--- a/drivers/mtd/spi-nor/issi.c
+++ b/drivers/mtd/spi-nor/issi.c
@@ -101,6 +101,12 @@ static const struct flash_info issi_nor_parts[] = {
 	}, {
 		.id = SNOR_ID(0x9d, 0x60, 0x19),
 		.name = "is25lp256",
+	}, {
+		.id = SNOR_ID(0x9d, 0x60, 0x20),
+		.name = "is25lp512mg",
+		.size = SZ_64M,
+		.flags = SPI_NOR_QUAD_PP,
+		.parse_sfdp = true,
 	}, {
 		.id = SNOR_ID(0x9d, 0x70, 0x16),
 		.name = "is25wp032",
-- 
2.51.0


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Re: [PATCH] mtd: spi-nor: issi: Add support for ISSI IS25LP512MG

[sashiko-bot]

Thank you for your contribution! Sashiko AI review found 2 potential
issues to consider:
- [High] mtd: spi-nor: issi: build failure from removed parse_sfdp
  initializer
- [Medium] mtd: spi-nor: issi: setting .size and .name breaks
  spi_nor_needs_sfdp()
--

commit b81da267d9946b2790b1da232d5027f7a818531c
Author: Matthew Parker <mparker@arista.com>

mtd: spi-nor: issi: Add support for ISSI IS25LP512MG

This commit adds a flash_info entry for the ISSI IS25LP512MG 64 MiB SPI NOR
flash in issi_nor_parts[].

> diff --git a/drivers/mtd/spi-nor/issi.c b/drivers/mtd/spi-nor/issi.c
> index 2f057d731df2a..977dc5ba80289 100644
> --- a/drivers/mtd/spi-nor/issi.c
> +++ b/drivers/mtd/spi-nor/issi.c
> @@ -101,6 +101,12 @@ static const struct flash_info issi_nor_parts[] = {
>  	}, {
>  		.id = SNOR_ID(0x9d, 0x60, 0x19),
>  		.name = "is25lp256",
> +	}, {
> +		.id = SNOR_ID(0x9d, 0x60, 0x20),
> +		.name = "is25lp512mg",
> +		.size = SZ_64M,

[Severity: Medium]
Does setting .size = SZ_64M break spi_nor_needs_sfdp() for this flash?

spi_nor_needs_sfdp() returns !nor->info->size, so setting .size causes
spi_nor_init_params() to ignore spi_nor_parse_sfdp() failures and fall back
to incomplete parameters without 4 KiB erase or fast-read modes.  In
addition, struct flash_info documents .name as obsolete for new SFDP-based
entries; both .size and .name should be omitted here.

> +		.flags = SPI_NOR_QUAD_PP,
> +		.parse_sfdp = true,

[Severity: High]
Does this fail to build when CONFIG_MTD_SPI_NOR is enabled?  struct
flash_info has no .parse_sfdp member since 3ea3f0ac242c ("mtd: spi-nor:
drop .parse_sfdp").

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261108004516.896887-1-mparker@arista.com?part=1

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