From d85879938d3fc3557f6ff74a60f95e0975a314ce Mon Sep 17 00:00:00 2001
From: Thomas Chou <thomas@wytron.com.tw>
Date: Sat, 7 Nov 2015 14:20:31 +0800
Subject: dm: implement a MTD uclass

Implement a Memory Technology Device (MTD) uclass. It should
include most flash drivers in the future. Though no uclass ops
are defined yet, the MTD ops could be used.

The NAND flash driver is based on MTD. The CFI flash and SPI
flash support MTD, too. It should make sense to convert them
to MTD uclass.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
---
 include/dm/uclass-id.h  |  1 +
 include/flash.h         |  3 +++
 include/linux/mtd/mtd.h |  2 ++
 include/mtd.h           | 23 +++++++++++++++++++++++
 4 files changed, 29 insertions(+)
 create mode 100644 include/mtd.h

(limited to 'include')

diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
index d0cf4ce6a0d..327de3486b5 100644
--- a/include/dm/uclass-id.h
+++ b/include/dm/uclass-id.h
@@ -43,6 +43,7 @@ enum uclass_id {
 	UCLASS_MISC,		/* Miscellaneous device */
 	UCLASS_MMC,		/* SD / MMC card or chip */
 	UCLASS_MOD_EXP,		/* RSA Mod Exp device */
+	UCLASS_MTD,		/* Memory Technology Device (MTD) device */
 	UCLASS_PCH,		/* x86 platform controller hub */
 	UCLASS_PCI,		/* PCI bus */
 	UCLASS_PCI_GENERIC,	/* Generic PCI bus device */
diff --git a/include/flash.h b/include/flash.h
index 5754cf97737..13e03842c84 100644
--- a/include/flash.h
+++ b/include/flash.h
@@ -41,6 +41,9 @@ typedef struct {
 	ulong   addr_unlock2;		/* unlock address 2 for AMD flash roms  */
 	const char *name;		/* human-readable name	                */
 #endif
+#ifdef CONFIG_MTD
+	struct mtd_info *mtd;
+#endif
 } flash_info_t;
 
 extern flash_info_t flash_info[]; /* info for FLASH chips	*/
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h
index e3d3fc73fd6..c2cd3df1fa5 100644
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -272,6 +272,8 @@ struct mtd_info {
 	struct module *owner;
 #ifndef __UBOOT__
 	struct device dev;
+#else
+	struct udevice *dev;
 #endif
 	int usecount;
 };
diff --git a/include/mtd.h b/include/mtd.h
new file mode 100644
index 00000000000..3f8c293b00e
--- /dev/null
+++ b/include/mtd.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _MTD_H_
+#define _MTD_H_
+
+#include <linux/mtd/mtd.h>
+
+/*
+ * Get mtd_info structure of the dev, which is stored as uclass private.
+ *
+ * @dev: The MTD device
+ * @return: pointer to mtd_info, NULL on error
+ */
+static inline struct mtd_info *mtd_get_info(struct udevice *dev)
+{
+	return dev_get_uclass_priv(dev);
+}
+
+#endif	/* _MTD_H_ */
-- 
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