ARM: uniphier: support ProXstream2, PH1-LD6b boards in single defconfig

These boards are similar enough to be supported in a single defconfig
file.  Distinguish one from another by "DEVICE_TREE" from the command
line.  The how-to-build in doc/README.uniphier should be also updated.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

configs/ph1_ld6b_defconfig → configs/uniphier_pxs2_ld6b_defconfig

 CONFIG_ARM=y
 CONFIG_ARCH_UNIPHIER=y
 CONFIG_SYS_MALLOC_F_LEN=0x2000
+CONFIG_ARCH_UNIPHIER_PROXSTREAM2=y
 CONFIG_ARCH_UNIPHIER_PH1_LD6B=y
 CONFIG_MICRO_SUPPORT_CARD=y
 CONFIG_SYS_TEXT_BASE=0x84000000
-CONFIG_DEFAULT_DEVICE_TREE="uniphier-ph1-ld6b-ref"
+CONFIG_DEFAULT_DEVICE_TREE="uniphier-proxstream2-vodka"
 CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_XIMG is not set
 # CONFIG_CMD_ENV_EXISTS is not set

doc/README.uniphier

@@ -48,14 +48,18 @@ PH1-Pro5:
     $ make ph1_pro5_defconfig
     $ make CROSS_COMPILE=arm-linux-gnueabi-
 
-ProXstream2:
-    $ make pxs2_defconfig
-    $ make CROSS_COMPILE=arm-linux-gnueabi-
+ProXstream2 Gentil board:
+    $ make uniphier_pxs2_ld6b_defconfig
+    $ make CROSS_COMPILE=arm-linux-gnueabi- DEVICE_TREE=uniphier-proxstream2-gentil
 
-PH1-LD6b:
-    $ make ph1_ld6b_defconfig
+ProXstream2 Vodka board:
+    $ make uniphier_pxs2_ld6b_defconfig
     $ make CROSS_COMPILE=arm-linux-gnueabi-
 
+PH1-LD6b reference board:
+    $ make uniphier_pxs2_ld6b_defconfig
+    $ make CROSS_COMPILE=arm-linux-gnueabi- DEVICE_TREE=uniphier-ph1-ld6b-ref
+
 You may wish to change the "CROSS_COMPILE=arm-linux-gnueabi-"
 to use your favorite compiler.