[PATCH] mtd:spinand:gigadevice:Add support for GD5F1GM9 chips

[gigadevice2025 at gmail.com]

From: Teng Wu <gigadevice2025 at gmail.com>

- GD5F1GM9UExxG (ID:c89101 3.3V)
- GD5F1GM9RExxG (ID:c88101 1.8V)

Both device feature:
  - 1Gb density (1024 blocks)
  - 2048-byte page size with 128-byte OOB
  - 8-bit ECC requirement per 512 bytes
  - Quad I/O Read support (opcode EBH)
  - tPROG ≤ 300us typical page program time

Testing environment:
  - Platform: Raspberry PI-5 (Linux raspberry 6.15.0-rc6-v8)
  - Operations verified:
    * Full device read/write/erase cycles on all blocks
    * Nandspeed:
      ~ GD5F1GM9UE: 2.75MB/s read, 1.99MB/s write, 41.26MB/s erase
      ~ GD5F1GM9RE: 1.84MB/s read, 1.45MB/s write, 41.04MS/s erase
    * Nandbiterrs: Both corredted 8-bit errors per 512 bytes
    * Stresstest: Both 144k cycles 0 bad block growth

Full test log:
 -U: https://gist.github.com/WT-886/b0f41fb50ddac3adc0020222c1f89b61
 -R: https://gist.github.com/WT-886/8784e72f4632d519814928ff49225963

Datasheet:
 -https://github.com/WT-886/DATASHEET/blob/main/GD5F1GM9-v1.0.pdf

Signed-off-by: Teng Wu <gigadevice2025 at gmail.com>
---
 drivers/mtd/nand/spi/gigadevice.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/mtd/nand/spi/gigadevice.c b/drivers/mtd/nand/spi/gigadevice.c
index d620bb02a..f781d0368 100644
--- a/drivers/mtd/nand/spi/gigadevice.c
+++ b/drivers/mtd/nand/spi/gigadevice.c
@@ -533,6 +533,26 @@ static const struct spinand_info gigadevice_spinand_table[] = {
 		     SPINAND_HAS_QE_BIT,
 		     SPINAND_ECCINFO(&gd5fxgqx_variant2_ooblayout,
 				     gd5fxgq4uexxg_ecc_get_status)),
+	SPINAND_INFO("GD5F1GM9UExxG",
+		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0x91, 0x01),
+		     NAND_MEMORG(1, 2048, 128, 64, 1024, 20, 1, 1, 1),
+		     NAND_ECCREQ(8, 512),
+		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants_1gq5,
+					      &write_cache_variants,
+					      &update_cache_variants),
+		     SPINAND_HAS_QE_BIT,
+		     SPINAND_ECCINFO(&gd5fxgqx_variant2_ooblayout,
+				     gd5fxgq4uexxg_ecc_get_status)),
+	SPINAND_INFO("GD5F1GM9RExxG",
+		     SPINAND_ID(SPINAND_READID_METHOD_OPCODE_DUMMY, 0x81, 0x01),
+		     NAND_MEMORG(1, 2048, 128, 64, 1024, 20, 1, 1, 1),
+		     NAND_ECCREQ(8, 512),
+		     SPINAND_INFO_OP_VARIANTS(&read_cache_variants_1gq5,
+					      &write_cache_variants,
+					      &update_cache_variants),
+		     SPINAND_HAS_QE_BIT,
+		     SPINAND_ECCINFO(&gd5fxgqx_variant2_ooblayout,
+				     gd5fxgq4uexxg_ecc_get_status)),
 };
 
 static const struct spinand_manufacturer_ops gigadevice_spinand_manuf_ops = {
-- 
2.48.1