mtd: vf610_nfc: add Freescale NFC controller configs to Kconfig

This commit allows users to enable/disable the Freescale NFC
controller found in systems like Vybrid (VF610), MPC5125, MCF54418
or Kinetis K70 via Kconfig with more detailed help docs.

Signed-off-by: Stefan Agner <stefan@agner.ch>
Acked-by: Stefano Babic <sbabic@denx.de>
[scottwood: updated vf610twr_nand_defconfig]
Signed-off-by: Scott Wood <scottwood@freescale.com>

configs/colibri_vf_defconfig

@@ -1,3 +1,5 @@
 CONFIG_ARM=y
 CONFIG_TARGET_COLIBRI_VF=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/toradex/colibri_vf/imximage.cfg,ENV_IS_IN_NAND,IMX_NAND"
+CONFIG_NAND_VF610_NFC=y
+CONFIG_SYS_NAND_VF610_NFC_60_ECC_BYTES=y

configs/vf610twr_defconfig

@@ -1,3 +1,5 @@
 CONFIG_ARM=y
 CONFIG_TARGET_VF610TWR=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/vf610twr/imximage.cfg,ENV_IS_IN_MMC"
+CONFIG_NAND_VF610_NFC=y
+CONFIG_SYS_NAND_BUSWIDTH_16BIT=y

configs/vf610twr_nand_defconfig

@@ -1,3 +1,5 @@
 CONFIG_ARM=y
 CONFIG_TARGET_VF610TWR=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/vf610twr/imximage.cfg,ENV_IS_IN_NAND"
+CONFIG_NAND_VF610_NFC=y
+CONFIG_SYS_NAND_BUSWIDTH_16BIT=y

doc/README.nand

@@ -188,24 +188,6 @@ Configuration Options:
 	This is used by SoC platforms which do not have built-in ELM
 	hardware engine required for BCH ECC correction.
 
-   CONFIG_SYS_NAND_BUSWIDTH_16BIT
-	Indicates that NAND device has 16-bit wide data-bus. In absence of this
-	config, bus-width of NAND device is assumed to be either 8-bit and later
-	determined by reading ONFI params.
-	Above config is useful when NAND device's bus-width information cannot
-	be determined from on-chip ONFI params, like in following scenarios:
-	- SPL boot does not support reading of ONFI parameters. This is done to
-	  keep SPL code foot-print small.
-	- In current U-Boot flow using nand_init(), driver initialization
-	  happens in board_nand_init() which is called before any device probe
-	  (nand_scan_ident + nand_scan_tail), thus device's ONFI parameters are
-	  not available while configuring controller. So a static CONFIG_NAND_xx
-	  is needed to know the device's bus-width in advance.
-	Some drivers using above config are:
-	drivers/mtd/nand/mxc_nand.c
-	drivers/mtd/nand/ndfc.c
-	drivers/mtd/nand/omap_gpmc.c
-
 
 Platform specific options
 =========================

drivers/mtd/nand/Kconfig

@@ -32,6 +32,36 @@ config NAND_DENALI_SPARE_AREA_SKIP_BYTES
 	  of OOB area before last ECC sector data starts.  This is potentially
 	  used to preserve the bad block marker in the OOB area.
 
+config NAND_VF610_NFC
+	bool "Support for Freescale NFC for VF610/MPC5125"
+	select SYS_NAND_SELF_INIT
+	help
+	  Enables support for NAND Flash Controller on some Freescale
+	  processors like the VF610, MPC5125, MCF54418 or Kinetis K70.
+	  The driver supports a maximum 2k page size. The driver
+	  currently does not support hardware ECC.
+
+comment "Generic NAND options"
+
+# Enhance depends when converting drivers to Kconfig which use this config
+# option (mxc_nand, ndfc, omap_gpmc).
+config SYS_NAND_BUSWIDTH_16BIT
+	bool "Use 16-bit NAND interface"
+	depends on NAND_VF610_NFC
+	help
+	  Indicates that NAND device has 16-bit wide data-bus. In absence of this
+	  config, bus-width of NAND device is assumed to be either 8-bit and later
+	  determined by reading ONFI params.
+	  Above config is useful when NAND device's bus-width information cannot
+	  be determined from on-chip ONFI params, like in following scenarios:
+	  - SPL boot does not support reading of ONFI parameters. This is done to
+	    keep SPL code foot-print small.
+	  - In current U-Boot flow using nand_init(), driver initialization
+	    happens in board_nand_init() which is called before any device probe
+	    (nand_scan_ident + nand_scan_tail), thus device's ONFI parameters are
+	    not available while configuring controller. So a static CONFIG_NAND_xx
+	    is needed to know the device's bus-width in advance.
+
 if SPL
 
 config SPL_NAND_DENALI

include/configs/colibri_vf.h

@@ -50,8 +50,6 @@
 
 /* NAND support */
 #define CONFIG_CMD_NAND
-#define CONFIG_NAND_VF610_NFC
-#define CONFIG_SYS_NAND_SELF_INIT
 #define CONFIG_SYS_MAX_NAND_DEVICE	1
 #define CONFIG_SYS_NAND_BASE		NFC_BASE_ADDR
 

include/configs/vf610twr.h

@@ -50,10 +50,7 @@
 #define CONFIG_CMD_NAND_TRIMFFS
 
 #ifdef CONFIG_CMD_NAND
-#define CONFIG_NAND_VF610_NFC
-#define CONFIG_SYS_NAND_SELF_INIT
 #define CONFIG_USE_ARCH_MEMCPY
-#define CONFIG_SYS_NAND_BUSWIDTH_16BIT
 #define CONFIG_SYS_MAX_NAND_DEVICE	1
 #define CONFIG_SYS_NAND_BASE		NFC_BASE_ADDR