ext: plumb out Kconfig support for external source code

Add missing Kconfig files and connections to expose Kconfig options
in ext/ directories.  Fixup QMSI to only be exposed on platforms that
utilize it.

Change-Id: I6c6c5011b2bf2966f65aa8279dc594a244821956
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>

Kconfig.zephyr

@@ -32,6 +32,8 @@ source "misc/Kconfig"
 
 source "lib/Kconfig"
 
+source "ext/Kconfig"
+
 #
 # The following are for Kconfig files for default values only.
 # These should be parsed at the end.

arch/arc/soc/quark_se_ss/Kconfig.soc

@@ -2,3 +2,4 @@
 config SOC_QUARK_SE_SS
         bool "Intel Quark SE - Sensor Sub System"
 	select SYS_POWER_LOW_POWER_STATE_SUPPORTED
+	select HAS_QMSI

arch/x86/soc/quark_d2000/Kconfig.soc

@@ -8,3 +8,4 @@ config  SOC_QUARK_D2000
         select XIP
         select MVIC
 	select X86_IAMCU
+	select HAS_QMSI

arch/x86/soc/quark_se/Kconfig.soc

@@ -12,3 +12,4 @@ config  SOC_QUARK_SE
 	select X86_IAMCU
 	select SYS_POWER_LOW_POWER_STATE_SUPPORTED
 	select SYS_POWER_DEEP_SLEEP_SUPPORTED
+	select HAS_QMSI

ext/Kconfig

@@ -0,0 +1,23 @@
+# Kconfig - external source code configuration options
+
+#
+# Copyright (c) 2016 Linaro Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+menu "External Sources"
+
+source "ext/hal/Kconfig"
+
+endmenu

ext/hal/Kconfig

@@ -0,0 +1,23 @@
+# Kconfig - external HAL source code configuration options
+
+#
+# Copyright (c) 2016 Linaro Ltd.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+menu "HALs"
+
+source "ext/hal/qmsi/Kconfig"
+
+endmenu

ext/hal/qmsi/Kconfig

@@ -15,6 +15,20 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
+
+config HAS_QMSI
+	bool
+
+menuconfig QMSI
+	bool "QMSI driver support"
+	default n
+	depends on HAS_QMSI
+	help
+	automatically set when either of QMSI_LIBRARY or QMSI_BUILTIN
+	is selected.
+
+if HAS_QMSI
+
 config QMSI_BUILTIN
 	bool "Enable QMSI drivers through integrated sources"
 	default n
@@ -32,13 +46,6 @@ config QMSI_LIBRARY
 	library (libqmsi) which implements several drivers for peripherals from
 	Intel MCUs (e.g. Quark SE and Quark D2000).
 
-config QMSI
-	bool
-	default n
-	help
-	automatically set when either of QMSI_LIBRARY or QMSI_BUILTIN
-	is selected.
-
 config QMSI_INSTALL_PATH
 	depends on QMSI_LIBRARY
 	string "QMSI install path"
@@ -46,3 +53,5 @@ config QMSI_INSTALL_PATH
 	This option holds the path where the QMSI library and headers are
 	installed. Make sure this option is properly set when QMSI_LIBRARY
 	is enabled otherwise the build will fail.
+
+endif