[MTD] physmap: make physmap compat explicit

The current method for always showing physmap compat address, size, and
width is a bit confusing.  If length is set to 0, then the address and
width are still shown but silently unused.  The physmap code itself
already has logic which sets compat based on length, so just pull that out
and into the Kconfig to make everything clear.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Cc: Bryan Wu <Bryan.Wu@analog.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

2 files changed, 18 insertions, 15 deletions

diff --git a/drivers/mtd/maps/Kconfig b/drivers/mtd/maps/Kconfig
index 5ea169362164..3788a548336c 100644
--- a/drivers/mtd/maps/Kconfig
+++ b/drivers/mtd/maps/Kconfig
@@ -23,9 +23,20 @@ config MTD_PHYSMAP
           To compile this driver as a module, choose M here: the
           module will be called physmap.
 
+config MTD_PHYSMAP_COMPAT
+        bool "Physmap compat support"
+        depends on MTD_PHYSMAP
+        default n
+        help
+          Setup a simple mapping via the Kconfig options.  Normally the
+          physmap configuration options are done via your board's
+          resource file.
+
+          If unsure, say N here.
+
 config MTD_PHYSMAP_START
         hex "Physical start address of flash mapping"
-        depends on MTD_PHYSMAP
+        depends on MTD_PHYSMAP_COMPAT
         default "0x8000000"
         help
           This is the physical memory location at which the flash chips
@@ -37,7 +48,7 @@ config MTD_PHYSMAP_START
 
 config MTD_PHYSMAP_LEN
         hex "Physical length of flash mapping"
-        depends on MTD_PHYSMAP
+        depends on MTD_PHYSMAP_COMPAT
         default "0"
         help
           This is the total length of the mapping of the flash chips on
@@ -51,7 +62,7 @@ config MTD_PHYSMAP_LEN
 
 config MTD_PHYSMAP_BANKWIDTH
         int "Bank width in octets"
-        depends on MTD_PHYSMAP
+        depends on MTD_PHYSMAP_COMPAT
         default "2"
         help
           This is the total width of the data bus of the flash devices
diff --git a/drivers/mtd/maps/physmap.c b/drivers/mtd/maps/physmap.c
index dfbf3f270cea..876dfab92847 100644
--- a/drivers/mtd/maps/physmap.c
+++ b/drivers/mtd/maps/physmap.c
@@ -251,14 +251,7 @@ static struct platform_driver physmap_flash_driver = {
 };
 
 
-#ifdef CONFIG_MTD_PHYSMAP_LEN
-#if CONFIG_MTD_PHYSMAP_LEN != 0
-#warning using PHYSMAP compat code
-#define PHYSMAP_COMPAT
-#endif
-#endif
-
-#ifdef PHYSMAP_COMPAT
+#ifdef CONFIG_MTD_PHYSMAP_COMPAT
 static struct physmap_flash_data physmap_flash_data = {
         .width          = CONFIG_MTD_PHYSMAP_BANKWIDTH,
 };
@@ -302,7 +295,7 @@ static int __init physmap_init(void)
         int err;
 
         err = platform_driver_register(&physmap_flash_driver);
-#ifdef PHYSMAP_COMPAT
+#ifdef CONFIG_MTD_PHYSMAP_COMPAT
         if (err == 0)
                 platform_device_register(&physmap_flash);
 #endif
@@ -312,7 +305,7 @@ static int __init physmap_init(void)
 
 static void __exit physmap_exit(void)
 {
-#ifdef PHYSMAP_COMPAT
+#ifdef CONFIG_MTD_PHYSMAP_COMPAT
         platform_device_unregister(&physmap_flash);
 #endif
         platform_driver_unregister(&physmap_flash_driver);
@@ -326,8 +319,7 @@ MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
 MODULE_DESCRIPTION("Generic configurable MTD map driver");
 
 /* legacy platform drivers can't hotplug or coldplg */
-#ifndef PHYSMAP_COMPAT
+#ifndef CONFIG_MTD_PHYSMAP_COMPAT
 /* work with hotplug and coldplug */
 MODULE_ALIAS("platform:physmap-flash");
 #endif
-