adc: Add drivers infrastructure

Only Kconfig file for now.

Change-Id: I633ac209583b2fe6cbed3c75036ac245f0058df6
Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>

drivers/Kconfig

@@ -61,4 +61,6 @@ source "drivers/pwm/Kconfig"
 
 source "drivers/pinmux/Kconfig"
 
+source "drivers/adc/Kconfig"
+
 endmenu

drivers/Makefile

@@ -15,3 +15,4 @@ obj-$(CONFIG_SPI) += spi/
 obj-$(CONFIG_GPIO) += gpio/
 obj-$(CONFIG_I2C) += i2c/
 obj-$(CONFIG_PWM) += pwm/
+obj-$(CONFIG_ADC) += adc/

drivers/adc/Kconfig

@@ -0,0 +1,48 @@
+# Kconfig - ADC configuration options
+
+#
+# Copyright (c) 2015 Intel Corporation
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1) Redistributions of source code must retain the above copyright notice,
+# this list of conditions and the following disclaimer.
+#
+# 2) Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+#
+# 3) Neither the name of Intel Corporation nor the names of its contributors
+# may be used to endorse or promote products derived from this software without
+# specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+#
+# ADC options
+#
+menuconfig ADC
+	bool
+	prompt "ADC drivers"
+	default n
+	help
+	Enable ADC (Analog to Digital Converter) driver configuration
+
+config  ADC_DEBUG
+	bool "ADC drivers debug output"
+	depends on ADC
+	default n
+	help
+	Enable debug output for ADC drivers