1 menu "Clock Source drivers"
16 def_bool y if CLKSRC_I8253 || CLKEVT_I8253 || I8253_LOCK
24 config DW_APB_TIMER_OF
29 config ARMADA_370_XP_TIMER
49 config CADENCE_TTC_TIMER
52 config CLKSRC_NOMADIK_MTU
54 depends on (ARCH_NOMADIK || ARCH_U8500)
57 Support for Multi Timer Unit. MTU provides access
58 to multiple interrupt generating programmable
59 32-bit free running decrementing counters.
61 config CLKSRC_NOMADIK_MTU_SCHED_CLOCK
63 depends on CLKSRC_NOMADIK_MTU
65 Use the Multi Timer Unit as the sched_clock.
67 config CLKSRC_DBX500_PRCMU
68 bool "Clocksource PRCMU Timer"
69 depends on UX500_SOC_DB8500
72 Use the always on PRCMU Timer as clocksource
74 config CLKSRC_DBX500_PRCMU_SCHED_CLOCK
75 bool "Clocksource PRCMU Timer sched_clock"
76 depends on (CLKSRC_DBX500_PRCMU && !CLKSRC_NOMADIK_MTU_SCHED_CLOCK)
79 Use the always on PRCMU Timer as sched_clock
82 bool "Clocksource for Energy Micro's EFM32 SoCs" if !ARCH_EFM32
83 depends on OF && ARM && (ARCH_EFM32 || COMPILE_TEST)
87 Support to use the timers of EFM32 SoCs as clock source and clock
92 select CLKSRC_OF if OF
94 config ARM_ARCH_TIMER_EVTSTREAM
95 bool "Support for ARM architected timer event stream generation"
96 default y if ARM_ARCH_TIMER
97 depends on ARM_ARCH_TIMER
99 This option enables support for event stream generation based on
100 the ARM architected timer. It is used for waking up CPUs executing
101 the wfe instruction at a frequency represented as a power-of-2
102 divisor of the clock rate.
103 The main use of the event stream is wfe-based timeouts of userspace
104 locking implementations. It might also be useful for imposing timeout
105 on wfe to safeguard against any programming errors in case an expected
106 event is not generated.
107 This must be disabled for hardware validation purposes to detect any
108 hardware anomalies of missing events.
110 config ARM_GLOBAL_TIMER
112 select CLKSRC_OF if OF
114 This options enables support for the ARM global timer unit
116 config CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
118 depends on ARM_GLOBAL_TIMER
121 Use ARM global timer clock source as sched_clock
123 config CLKSRC_METAG_GENERIC
126 This option enables support for the Meta per-thread timers.
128 config CLKSRC_EXYNOS_MCT
129 def_bool y if ARCH_EXYNOS
131 Support for Multi Core Timer controller on Exynos SoCs.
133 config CLKSRC_SAMSUNG_PWM
136 This is a new clocksource driver for the PWM timer found in
137 Samsung S3C, S5P and Exynos SoCs, replacing an earlier driver
138 for all devicetree enabled platforms. This driver will be
139 needed only on systems that do not have the Exynos MCT available.
144 Support for Freescale FlexTimer Module (FTM) timer.
149 Support for Period Interrupt Timer on Freescale Vybrid Family SoCs.
151 config SYS_SUPPORTS_SH_CMT
159 config SYS_SUPPORTS_SH_MTU2
162 config SYS_SUPPORTS_SH_TMU
165 config SYS_SUPPORTS_EM_STI
169 bool "Renesas CMT timer driver" if COMPILE_TEST
170 depends on GENERIC_CLOCKEVENTS
171 default SYS_SUPPORTS_SH_CMT
173 This enables build of a clocksource and clockevent driver for
174 the Compare Match Timer (CMT) hardware available in 16/32/48-bit
175 variants on a wide range of Mobile and Automotive SoCs from Renesas.
178 bool "Renesas MTU2 timer driver" if COMPILE_TEST
179 depends on GENERIC_CLOCKEVENTS
180 default SYS_SUPPORTS_SH_MTU2
182 This enables build of a clockevent driver for the Multi-Function
183 Timer Pulse Unit 2 (MTU2) hardware available on SoCs from Renesas.
184 This hardware comes with 16 bit-timer registers.
187 bool "Renesas TMU timer driver" if COMPILE_TEST
188 depends on GENERIC_CLOCKEVENTS
189 default SYS_SUPPORTS_SH_TMU
191 This enables build of a clocksource and clockevent driver for
192 the 32-bit Timer Unit (TMU) hardware available on a wide range
196 bool "Renesas STI timer driver" if COMPILE_TEST
197 depends on GENERIC_CLOCKEVENTS
198 default SYS_SUPPORTS_EM_STI
200 This enables build of a clocksource and clockevent driver for
201 the 48-bit System Timer (STI) hardware available on a SoCs
202 such as EMEV2 from former NEC Electronics.
207 config CLKSRC_VERSATILE
208 bool "ARM Versatile (Express) reference platforms clock source"
209 depends on GENERIC_SCHED_CLOCK && !ARCH_USES_GETTIMEOFFSET
211 default y if MFD_VEXPRESS_SYSREG
213 This option enables clock source based on free running
214 counter available in the "System Registers" block of
215 ARM Versatile, RealView and Versatile Express reference