[PATCH] mtd: spi-nor: XTX: Add support for XTX XT25F128B

[Chris Morgan]

Add support for a new vendor (XTX) along with a new chip from the
vendor (XT25F128B). This chip is used in the Odroid Go Advance,
and has been tested extensively using the spi-gpio driver, as it
is connected to a serial flash controller that is not currently
supported (but the pins can be repurposed to GPIO). Read, write, and
erase all work as expected.

Datasheet can be found here:
https://datasheet.lcsc.com/szlcsc/2005251034_XTX-XT25F128BSSIGT_C558844.pdf

Signed-off-by: Chris Morgan <macromorgan at hotmail.com>
---
 drivers/mtd/spi-nor/Makefile |  1 +
 drivers/mtd/spi-nor/core.c   |  1 +
 drivers/mtd/spi-nor/core.h   |  1 +
 drivers/mtd/spi-nor/xtx.c    | 24 ++++++++++++++++++++++++
 4 files changed, 27 insertions(+)
 create mode 100644 drivers/mtd/spi-nor/xtx.c

diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile
index 653923896205..3f7a52d7fa0b 100644
--- a/drivers/mtd/spi-nor/Makefile
+++ b/drivers/mtd/spi-nor/Makefile
@@ -17,6 +17,7 @@ spi-nor-objs			+= sst.o
 spi-nor-objs			+= winbond.o
 spi-nor-objs			+= xilinx.o
 spi-nor-objs			+= xmc.o
+spi-nor-objs			+= xtx.o
 obj-$(CONFIG_MTD_SPI_NOR)	+= spi-nor.o
 
 obj-$(CONFIG_MTD_SPI_NOR)	+= controllers/
diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 0522304f52fa..9a89ec473e4b 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -2215,6 +2215,7 @@ static const struct spi_nor_manufacturer *manufacturers[] = {
 	&spi_nor_winbond,
 	&spi_nor_xilinx,
 	&spi_nor_xmc,
+	&spi_nor_xtx,
 };
 
 static const struct flash_info *
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 4a3f7f150b5d..ee0e45eaffcd 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -425,6 +425,7 @@ extern const struct spi_nor_manufacturer spi_nor_sst;
 extern const struct spi_nor_manufacturer spi_nor_winbond;
 extern const struct spi_nor_manufacturer spi_nor_xilinx;
 extern const struct spi_nor_manufacturer spi_nor_xmc;
+extern const struct spi_nor_manufacturer spi_nor_xtx;
 
 void spi_nor_spimem_setup_op(const struct spi_nor *nor,
 			     struct spi_mem_op *op,
diff --git a/drivers/mtd/spi-nor/xtx.c b/drivers/mtd/spi-nor/xtx.c
new file mode 100644
index 000000000000..4eec737e94c7
--- /dev/null
+++ b/drivers/mtd/spi-nor/xtx.c
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2021, Chris Morgan <macromorgan at hotmail.com>
+ * Based on XMC SPI NOR module
+ * Copyright (C) 2005, Intec Automation Inc.
+ * Copyright (C) 2014, Freescale Semiconductor, Inc.
+ */
+
+#include <linux/mtd/spi-nor.h>
+
+#include "core.h"
+
+static const struct flash_info xtx_parts[] = {
+	/* XTX (XTX Technology Limited) */
+	{ "XT25F128B", INFO(0x0b4018, 0, 64 * 1024, 256,
+			     SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ |
+			     SPI_NOR_HAS_LOCK | SPI_NOR_HAS_TB) },
+};
+
+const struct spi_nor_manufacturer spi_nor_xtx = {
+	.name = "xtx",
+	.parts = xtx_parts,
+	.nparts = ARRAY_SIZE(xtx_parts),
+};
-- 
2.25.1