[U-Boot] [RFC PATCH 3/5] arm: Kconfig: Add entry for MMU

[Lokesh Vutla]

Add a Kconfig entry for MMU and imply for all platforms
using cache-cp15.c. Using imply instead of select so that
MMU can be disabled by defconfigs when not needed.

Signed-off-by: Lokesh Vutla <lokeshvutla at ti.com>
---
 arch/arm/Kconfig      | 15 +++++++++++++++
 arch/arm/lib/Makefile |  6 +-----
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index de36ab6701..fe5bff097d 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -74,6 +74,12 @@ config ARM_ASM_UNIFIED
 config THUMB2_KERNEL
 	bool
 
+config MMU
+	bool "MMU-based Paged Memory Management Support"
+	help
+	  Select if you want MMU-based virtualised addressing space
+	  support by paged memory management.
+
 # If set, the workarounds for these ARM errata are applied early during U-Boot
 # startup. Note that in general these options force the workarounds to be
 # applied; no CPU-type/version detection exists, unlike the similar options in
@@ -158,33 +164,40 @@ config ARM_ERRATA_855873
 config CPU_ARM720T
 	bool
 	select SYS_CACHE_SHIFT_5
+	imply MMU
 
 config CPU_ARM920T
 	bool
 	select SYS_CACHE_SHIFT_5
+	imply MMU
 
 config CPU_ARM926EJS
 	bool
 	select SYS_CACHE_SHIFT_5
+	imply MMU
 
 config CPU_ARM946ES
 	bool
 	select SYS_CACHE_SHIFT_5
+	imply MMU
 
 config CPU_ARM1136
 	bool
 	select SYS_CACHE_SHIFT_5
+	imply MMU
 
 config CPU_ARM1176
 	bool
 	select HAS_VBAR
 	select SYS_CACHE_SHIFT_5
+	imply MMU
 
 config CPU_V7
 	bool
 	select HAS_VBAR
 	select HAS_THUMB2
 	select SYS_CACHE_SHIFT_6
+	imply MMU
 
 config CPU_V7M
 	bool
@@ -200,10 +213,12 @@ config CPU_V7R
 config CPU_PXA
 	bool
 	select SYS_CACHE_SHIFT_5
+	imply MMU
 
 config CPU_SA1100
 	bool
 	select SYS_CACHE_SHIFT_5
+	imply MMU
 
 config SYS_CPU
 	default "arm720t" if CPU_ARM720T
diff --git a/arch/arm/lib/Makefile b/arch/arm/lib/Makefile
index 3d3085e917..f907adc161 100644
--- a/arch/arm/lib/Makefile
+++ b/arch/arm/lib/Makefile
@@ -63,11 +63,7 @@ obj-y	+= reset.o
 endif
 
 obj-y	+= cache.o
-ifndef CONFIG_ARM64
-ifndef CONFIG_CPU_V7M
-obj-y	+= cache-cp15.o
-endif
-endif
+obj-$(CONFIG_MMU)	+= cache-cp15.o
 
 obj-y	+= psci-dt.o
 
-- 
2.17.0