dts: drop HAS_DTS

HAS_DTS has become a redundant option. All Zephyr architectures now
select this option, meaning devicetree has become a de-facto
requirement.  In fact, if any board does not provide a devicetree
source, the build system uses an empty stub, meaning the devicetree
machinery always runs.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

arch/Kconfig

@@ -19,7 +19,6 @@ source "$(ARCH_DIR)/$(ARCH)/Kconfig"
 config ARC
 	bool
 	select ARCH_IS_SET
-	select HAS_DTS
 	imply XIP
 	select ARCH_HAS_THREAD_LOCAL_STORAGE
 	select ARCH_SUPPORTS_ROM_START
@@ -30,7 +29,6 @@ config ARM
 	bool
 	select ARCH_IS_SET
 	select ARCH_SUPPORTS_COREDUMP if CPU_CORTEX_M
-	select HAS_DTS
 	# FIXME: current state of the code for all ARM requires this, but
 	# is really only necessary for Cortex-M with ARM MPU!
 	select GEN_PRIV_STACKS
@@ -43,7 +41,6 @@ config ARM64
 	bool
 	select ARCH_IS_SET
 	select 64BIT
-	select HAS_DTS
 	select ARCH_SUPPORTS_COREDUMP
 	select HAS_ARM_SMCCC
 	select ARCH_HAS_THREAD_LOCAL_STORAGE
@@ -58,14 +55,12 @@ config MIPS
 	bool
 	select ARCH_IS_SET
 	select ATOMIC_OPERATIONS_C
-	select HAS_DTS
 	help
 	  MIPS architecture
 
 config SPARC
 	bool
 	select ARCH_IS_SET
-	select HAS_DTS
 	select USE_SWITCH
 	select USE_SWITCH_SUPPORTED
 	select BIG_ENDIAN
@@ -80,7 +75,6 @@ config X86
 	bool
 	select ARCH_IS_SET
 	select ATOMIC_OPERATIONS_BUILTIN
-	select HAS_DTS
 	select ARCH_SUPPORTS_COREDUMP
 	select ARCH_SUPPORTS_ROM_START if !X86_64
 	select CPU_HAS_MMU
@@ -102,7 +96,6 @@ config NIOS2
 	bool
 	select ARCH_IS_SET
 	select ATOMIC_OPERATIONS_C
-	select HAS_DTS
 	imply XIP
 	select ARCH_HAS_TIMING_FUNCTIONS
 	help
@@ -111,7 +104,6 @@ config NIOS2
 config RISCV
 	bool
 	select ARCH_IS_SET
-	select HAS_DTS
 	select ARCH_SUPPORTS_COREDUMP
 	select ARCH_SUPPORTS_ROM_START if !SOC_SERIES_ESP32C3
 	select ARCH_HAS_CODE_DATA_RELOCATION
@@ -128,7 +120,6 @@ config RISCV
 config XTENSA
 	bool
 	select ARCH_IS_SET
-	select HAS_DTS
 	select USE_SWITCH
 	select USE_SWITCH_SUPPORTED
 	select IRQ_OFFLOAD_NESTED if IRQ_OFFLOAD
@@ -141,7 +132,6 @@ config XTENSA
 config ARCH_POSIX
 	bool
 	select ARCH_IS_SET
-	select HAS_DTS
 	select ATOMIC_OPERATIONS_BUILTIN
 	select ARCH_HAS_CUSTOM_SWAP_TO_MAIN
 	select ARCH_HAS_CUSTOM_BUSY_WAIT

cmake/modules/dts.cmake

@@ -9,9 +9,6 @@ include(pre_dt)
 find_package(HostTools)
 find_package(Dtc 1.4.6)
 
-# Zephyr code is usually configured using devicetree, but this is
-# still technically optional (see e.g. CONFIG_HAS_DTS).
-#
 # This module makes information from the devicetree available to
 # various build stages, as well as to other arbitrary Python scripts:
 #
@@ -125,8 +122,6 @@ set(DTS_CMAKE                   ${PROJECT_BINARY_DIR}/dts.cmake)
 # modules.
 set(VENDOR_PREFIXES             dts/bindings/vendor-prefixes.txt)
 
-# TODO: What to do about non-posix platforms where NOT CONFIG_HAS_DTS (xtensa)?
-# Drop support for NOT CONFIG_HAS_DTS perhaps?
 set_ifndef(DTS_SOURCE ${BOARD_DIR}/${BOARD}.dts)
 if(EXISTS ${DTS_SOURCE})
   # We found a devicetree. Check for a board revision overlay.

dts/Kconfig

@@ -1,11 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
 
-config HAS_DTS
-	bool
-	help
-	  This option specifies that the target platform supports device tree
-	  configuration.
-
 menu "Devicetree Info"
 
 osource "$(KCONFIG_BINARY_DIR)/Kconfig.dts"

include/zephyr/device.h

@@ -1005,7 +1005,6 @@ static inline bool z_impl_device_is_ready(const struct device *dev)
                                                                                \
 	Z_DEVICE_INIT_ENTRY_DEFINE(node_id, dev_id, init_fn, level, prio)
 
-#if defined(CONFIG_HAS_DTS) || defined(__DOXYGEN__)
 /**
  * @brief Declare a device for each status "okay" devicetree node.
  *
@@ -1020,7 +1019,6 @@ static inline bool z_impl_device_is_ready(const struct device *dev)
 	extern const struct device DEVICE_DT_NAME_GET(node_id);
 
 DT_FOREACH_STATUS_OKAY_NODE(Z_MAYBE_DEVICE_DECLARE_INTERNAL)
-#endif /* CONFIG_HAS_DTS */
 
 /** @endcond */
 

include/zephyr/drivers/emul.h

@@ -191,11 +191,9 @@ const struct emul *emul_get_binding(const char *name);
  * @}
  */
 
-#if defined(CONFIG_HAS_DTS) || defined(__DOXYGEN__)
 #define Z_MAYBE_EMUL_DECLARE_INTERNAL(node_id) extern const struct emul EMUL_DT_NAME_GET(node_id);
 
 DT_FOREACH_STATUS_OKAY_NODE(Z_MAYBE_EMUL_DECLARE_INTERNAL);
-#endif /* CONFIG_HAS_DTS || __DOXYGEN__ */
 
 #ifdef __cplusplus
 }

include/zephyr/drivers/sensor.h

@@ -1260,8 +1260,6 @@ static inline int64_t sensor_value_to_micro(const struct sensor_value *val)
  * @}
  */
 
-#if defined(CONFIG_HAS_DTS) || defined(__DOXYGEN__)
-
 /**
  * @brief Get the decoder name for the current driver
  *
@@ -1309,7 +1307,6 @@ static inline int64_t sensor_value_to_micro(const struct sensor_value *val)
 		    ())
 
 DT_FOREACH_STATUS_OKAY_NODE(Z_MAYBE_SENSOR_DECODER_DECLARE_INTERNAL)
-#endif /* defined(CONFIG_HAS_DTS) || defined(__DOXYGEN__) */
 
 #ifdef __cplusplus
 }

subsys/shell/backends/Kconfig.backends

@@ -18,8 +18,7 @@ config SHELL_BACKEND_SERIAL
 	bool "Serial backend"
 	# Serial (UART) requires interrupts and the RTT backend cannot be used from an ISR context.
 	default n if SHELL_BACKEND_RTT
-	default "$(dt_chosen_enabled,$(DT_CHOSEN_Z_SHELL_UART))" if HAS_DTS
-	default y if !HAS_DTS
+	default "$(dt_chosen_enabled,$(DT_CHOSEN_Z_SHELL_UART))"
 	select SERIAL
 	select RING_BUFFER
 	help