[PATCH v3 2/4] mtd: spi-nor-core: Adding different type of command extension in Soft Reset

[JaimeLiao]

Power-on-Reset is a method to restore flash back to 1S-1S-1S mode from 8D-8D-8D
in the begging of probe.

Command extension type is not standardized across flash vendors in DTR mode.

For suiting different vendor flash devices, adding a flag to seperate types if
nor->cmd_ext_type didn't configure from SFDP.

Signed-off-by: JaimeLiao <jaimeliao.tw at gmail.com>
---
 drivers/mtd/spi/Kconfig        | 6 ++++++
 drivers/mtd/spi/spi-nor-core.c | 7 ++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/spi/Kconfig b/drivers/mtd/spi/Kconfig
index 67599b32c9..d850480401 100644
--- a/drivers/mtd/spi/Kconfig
+++ b/drivers/mtd/spi/Kconfig
@@ -97,6 +97,12 @@ config SPI_FLASH_SMART_HWCAPS
 	 can support a type of operation in a much more refined way compared
 	 to using flags like SPI_RX_DUAL, SPI_TX_QUAD, etc.
 
+config SPI_NOR_CMD_EXT_INVERT
+	bool "Command extension type is INVERT for SPI NOR flashed"
+	default n
+	help
+	 Define command extension type is INVERT.
+
 config SPI_FLASH_SOFT_RESET
 	bool "Software Reset support for SPI NOR flashes"
 	default n
diff --git a/drivers/mtd/spi/spi-nor-core.c b/drivers/mtd/spi/spi-nor-core.c
index b8dda02aa7..4bcd58d839 100644
--- a/drivers/mtd/spi/spi-nor-core.c
+++ b/drivers/mtd/spi/spi-nor-core.c
@@ -3661,7 +3661,12 @@ static int spi_nor_soft_reset(struct spi_nor *nor)
 	enum spi_nor_cmd_ext ext;
 
 	ext = nor->cmd_ext_type;
-	nor->cmd_ext_type = SPI_NOR_EXT_REPEAT;
+	if (!nor->cmd_ext_type) {
+		nor->cmd_ext_type = SPI_NOR_EXT_REPEAT;
+#ifdef CONFIG_SPI_NOR_CMD_EXT_INVERT
+		nor->cmd_ext_type = SPI_NOR_EXT_INVERT;
+#endif
+	}
 
 	op = (struct spi_mem_op)SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_SRSTEN, 0),
 			SPI_MEM_OP_NO_DUMMY,
-- 
2.17.1