mtd: spi-nor: winbond: add Zetta ZD25Q128C support

Zetta normally uses BAh as its vendor ID. But for the ZD25Q128C they
took the one from Winbond and messed up the size parameters in SFDP.
Most functions seem compatible with the W25Q128, we just have to fix up
the size.

Link: http://www.zettadevice.com/upload/file/20150821/DS_Zetta_25Q128_RevA.pdf
Link: https://www.lcsc.com/datasheet/lcsc_datasheet_2312081757_Zetta-ZD25Q128CSIGT_C19626875.pdf
Signed-off-by: Michael Walle <mwalle@kernel.org>
Reviewed-by: Pratyush Yadav <pratyush@kernel.org>
Signed-off-by: Pratyush Yadav <pratyush@kernel.org>
Link: https://lore.kernel.org/r/20240804221535.291923-1-mwalle@kernel.org

diff --git a/drivers/mtd/spi-nor/winbond.c b/drivers/mtd/spi-nor/winbond.c
index e065e4fd42a33dc953a4a8650b6b39552e6390b5..9f7ce5763e7104a5db9c503ffb41d45b5d393598 100644 (file)
--- a/drivers/mtd/spi-nor/winbond.c
+++ b/drivers/mtd/spi-nor/winbond.c
@@ -17,6 +17,31 @@
                   SPI_MEM_OP_NO_DUMMY,                                 \
                   SPI_MEM_OP_DATA_OUT(1, buf, 0))
 
+static int
+w25q128_post_bfpt_fixups(struct spi_nor *nor,
+                        const struct sfdp_parameter_header *bfpt_header,
+                        const struct sfdp_bfpt *bfpt)
+{
+       /*
+        * Zetta ZD25Q128C is a clone of the Winbond device. But the encoded
+        * size is really wrong. It seems that they confused Mbit with MiB.
+        * Thus the flash is discovered as a 2MiB device.
+        */
+       if (bfpt_header->major == SFDP_JESD216_MAJOR &&
+           bfpt_header->minor == SFDP_JESD216_MINOR &&
+           nor->params->size == SZ_2M &&
+           nor->params->erase_map.regions[0].size == SZ_2M) {
+               nor->params->size = SZ_16M;
+               nor->params->erase_map.regions[0].size = SZ_16M;
+       }
+
+       return 0;
+}
+
+static const struct spi_nor_fixups w25q128_fixups = {
+       .post_bfpt = w25q128_post_bfpt_fixups,
+};
+
 static int
 w25q256_post_bfpt_fixups(struct spi_nor *nor,
                         const struct sfdp_parameter_header *bfpt_header,
@@ -108,6 +133,7 @@ static const struct flash_info winbond_nor_parts[] = {
                .size = SZ_16M,
                .flags = SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB,
                .no_sfdp_flags = SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ,
+               .fixups = &w25q128_fixups,
        }, {
                .id = SNOR_ID(0xef, 0x40, 0x19),
                .name = "w25q256",