mtd: lpddr: add driver for LPDDR2-NVM PCM memories

Signed-off-by: Vincenzo Aliberti <vincenzo.aliberti@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

drivers/mtd/lpddr/Kconfig

@@ -1,5 +1,5 @@
-menu "LPDDR flash memory drivers"
-	depends on MTD!=n
+menu "LPDDR & LPDDR2 PCM memory drivers"
+	depends on MTD
 
 config MTD_LPDDR
 	tristate "Support for LPDDR flash chips"
@@ -17,4 +17,12 @@ config MTD_QINFO_PROBE
 	    Window QINFO interface, permits software to be used for entire
 	    families of devices. This serves similar purpose of CFI on legacy
 	    Flash products
+
+config MTD_LPDDR2_NVM
+	depends on MTD
+	tristate "Support for LPDDR2-NVM flash chips"
+	help
+	  This option enables support of PCM memories with a LPDDR2-NVM
+	  (Low power double data rate 2) interface.
+
 endmenu

drivers/mtd/lpddr/Makefile

@@ -4,3 +4,4 @@
 
 obj-$(CONFIG_MTD_QINFO_PROBE)	+= qinfo_probe.o
 obj-$(CONFIG_MTD_LPDDR)	+= lpddr_cmds.o
+obj-$(CONFIG_MTD_LPDDR2_NVM) += lpddr2_nvm.o

include/uapi/mtd/mtd-abi.h

@@ -109,6 +109,7 @@ struct mtd_write_req {
 #define MTD_CAP_RAM		(MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
 #define MTD_CAP_NORFLASH	(MTD_WRITEABLE | MTD_BIT_WRITEABLE)
 #define MTD_CAP_NANDFLASH	(MTD_WRITEABLE)
+#define MTD_CAP_NVRAM		(MTD_WRITEABLE | MTD_BIT_WRITEABLE | MTD_NO_ERASE)
 
 /* Obsolete ECC byte placement modes (used with obsolete MEMGETOOBSEL) */
 #define MTD_NANDECC_OFF		0	// Switch off ECC (Not recommended)