[PATCH v3 5/5] mtd: spi-nor: micron-st: Add support for mt25qu01g

[Tudor Ambarus]

From: Fabio Estevam <festevam@xxxxxxx>

Add support for the MT25QU01G 128MB Micron Serial NOR Flash Memory
model.

Link: https://www.micron.com/-/media/client/global/documents/products/data-sheet/nor-flash/serial-nor/mt25q/die-rev-b/mt25q_qlkt_u_01g_bbb_0.pdf
Signed-off-by: Fabio Estevam <festevam@xxxxxxx>
[ta: introduce die erase]
Signed-off-by: Tudor Ambarus <tudor.ambarus@xxxxxxxxxx>
---
 drivers/mtd/spi-nor/micron-st.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/mtd/spi-nor/micron-st.c b/drivers/mtd/spi-nor/micron-st.c
index b63f1e9b97d0..3c6499fdb712 100644
--- a/drivers/mtd/spi-nor/micron-st.c
+++ b/drivers/mtd/spi-nor/micron-st.c
@@ -209,10 +209,30 @@ static int st_nor_four_die_late_init(struct spi_nor *nor)
 	return spi_nor_set_4byte_addr_mode(nor, true);
 }
 
+static int st_nor_two_die_late_init(struct spi_nor *nor)
+{
+	struct spi_nor_flash_parameter *params = nor->params;
+
+	params->die_erase_opcode = SPINOR_OP_MT_DIE_ERASE;
+	params->n_dice = 2;
+
+	/*
+	 * Unfortunately the die erase opcode does not have a 4-byte opcode
+	 * correspondent for these flashes. The SFDP 4BAIT table fails to
+	 * consider the die erase too. We're forced to enter in the 4 byte
+	 * address mode in order to benefit of the die erase.
+	 */
+	return spi_nor_set_4byte_addr_mode(nor, true);
+}
+
 static struct spi_nor_fixups n25q00_fixups = {
 	.late_init = st_nor_four_die_late_init,
 };
 
+static struct spi_nor_fixups mt25q01_fixups = {
+	.late_init = st_nor_two_die_late_init,
+};
+
 static struct spi_nor_fixups mt25q02_fixups = {
 	.late_init = st_nor_four_die_late_init,
 };
@@ -455,6 +475,11 @@ static const struct flash_info st_nor_parts[] = {
 			 SPI_NOR_BP3_SR_BIT6,
 		.no_sfdp_flags = SECT_4K | SPI_NOR_QUAD_READ,
 		.mfr_flags = USE_FSR,
+	}, {
+		.id = SNOR_ID(0x20, 0xbb, 0x21, 0x10, 0x44, 0x00),
+		.name = "mt25qu01g",
+		.mfr_flags = USE_FSR,
+		.fixups = &mt25q01_fixups,
 	}, {
 		.id = SNOR_ID(0x20, 0xbb, 0x21),
 		.name = "n25q00a",
-- 
2.34.1