drivers: Add I2S (Inter-IC Sound) driver infrastructure

Only Kconfig/Makefile file for now.

Origin: Original

Jira: ZEP-230
Signed-off-by: Piotr Mienkowski <piotr.mienkowski@gmail.com>

drivers/Kconfig

@@ -44,6 +44,8 @@ source "drivers/spi/Kconfig"
 
 source "drivers/i2c/Kconfig"
 
+source "drivers/i2s/Kconfig"
+
 source "drivers/pwm/Kconfig"
 
 source "drivers/pinmux/Kconfig"

drivers/Makefile

@@ -15,6 +15,7 @@ obj-$(CONFIG_FLASH) += flash/
 obj-$(CONFIG_COUNTER) += counter/
 obj-$(CONFIG_GPIO) += gpio/
 obj-$(CONFIG_I2C) += i2c/
+obj-$(CONFIG_I2S) += i2s/
 obj-$(CONFIG_PWM) += pwm/
 obj-$(CONFIG_ADC) += adc/
 obj-$(CONFIG_NET_L2_ETHERNET) += ethernet/

drivers/i2s/Kconfig

@@ -0,0 +1,43 @@
+# Kconfig - I2S (Inter-IC Sound) driver configuration options
+#
+# Copyright (c) 2017 Piotr Mienkowski
+# SPDX-License-Identifier: Apache-2.0
+#
+
+#
+# I2S Drivers
+#
+menuconfig I2S
+	bool
+	prompt "I2S bus drivers"
+	default n
+	help
+	  Enable support for the I2S (Inter-IC Sound) hardware bus.
+
+if I2S
+
+config I2S_INIT_PRIORITY
+	int "Init priority"
+	default 70
+	help
+	  Device driver initialization priority.
+
+config SYS_LOG_I2S_LEVEL
+	int "I2S Driver Log level"
+	depends on SYS_LOG
+	default 0
+	range 0 4
+	help
+	  Sets log level for I2S drivers.
+	  Levels are:
+	  0 OFF, do not write
+	  1 ERROR, only write SYS_LOG_ERR
+	  2 WARNING, write SYS_LOG_WRN in addition to previous level
+	  3 INFO, write SYS_LOG_INF in addition to previous levels
+	  4 DEBUG, write SYS_LOG_DBG in addition to previous levels
+
+comment "Device Drivers"
+
+source "drivers/i2s/Kconfig.*"
+
+endif # I2S

drivers/i2s/Makefile

@@ -0,0 +1,2 @@
+# No C files (yet)
+obj- += dummy.o