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
56 config CADENCE_TTC_TIMER
59 config CLKSRC_NOMADIK_MTU
61 depends on (ARCH_NOMADIK || ARCH_U8500)
64 Support for Multi Timer Unit. MTU provides access
65 to multiple interrupt generating programmable
66 32-bit free running decrementing counters.
68 config CLKSRC_NOMADIK_MTU_SCHED_CLOCK
70 depends on CLKSRC_NOMADIK_MTU
72 Use the Multi Timer Unit as the sched_clock.
74 config CLKSRC_DBX500_PRCMU
75 bool "Clocksource PRCMU Timer"
76 depends on UX500_SOC_DB8500
79 Use the always on PRCMU Timer as clocksource
81 config CLKSRC_DBX500_PRCMU_SCHED_CLOCK
82 bool "Clocksource PRCMU Timer sched_clock"
83 depends on (CLKSRC_DBX500_PRCMU && !CLKSRC_NOMADIK_MTU_SCHED_CLOCK)
86 Use the always on PRCMU Timer as sched_clock
89 bool "Clocksource for Energy Micro's EFM32 SoCs" if !ARCH_EFM32
90 depends on OF && ARM && (ARCH_EFM32 || COMPILE_TEST)
94 Support to use the timers of EFM32 SoCs as clock source and clock
99 select CLKSRC_OF if OF
101 config ARM_ARCH_TIMER_EVTSTREAM
102 bool "Support for ARM architected timer event stream generation"
103 default y if ARM_ARCH_TIMER
104 depends on ARM_ARCH_TIMER
106 This option enables support for event stream generation based on
107 the ARM architected timer. It is used for waking up CPUs executing
108 the wfe instruction at a frequency represented as a power-of-2
109 divisor of the clock rate.
110 The main use of the event stream is wfe-based timeouts of userspace
111 locking implementations. It might also be useful for imposing timeout
112 on wfe to safeguard against any programming errors in case an expected
113 event is not generated.
114 This must be disabled for hardware validation purposes to detect any
115 hardware anomalies of missing events.
117 config ARM_GLOBAL_TIMER
119 select CLKSRC_OF if OF
121 This options enables support for the ARM global timer unit
123 config CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
125 depends on ARM_GLOBAL_TIMER
128 Use ARM global timer clock source as sched_clock
131 select CLKSRC_OF if OF
132 def_bool SOC_AT91SAM9 || SOC_SAMA5
134 config CLKSRC_METAG_GENERIC
137 This option enables support for the Meta per-thread timers.
139 config CLKSRC_EXYNOS_MCT
140 def_bool y if ARCH_EXYNOS
143 Support for Multi Core Timer controller on Exynos SoCs.
145 config CLKSRC_SAMSUNG_PWM
148 This is a new clocksource driver for the PWM timer found in
149 Samsung S3C, S5P and Exynos SoCs, replacing an earlier driver
150 for all devicetree enabled platforms. This driver will be
151 needed only on systems that do not have the Exynos MCT available.
156 Support for Freescale FlexTimer Module (FTM) timer.
161 Support for Period Interrupt Timer on Freescale Vybrid Family SoCs.
163 config SYS_SUPPORTS_SH_CMT
171 config SYS_SUPPORTS_SH_MTU2
174 config SYS_SUPPORTS_SH_TMU
177 config SYS_SUPPORTS_EM_STI
181 bool "Renesas CMT timer driver" if COMPILE_TEST
182 depends on GENERIC_CLOCKEVENTS
183 default SYS_SUPPORTS_SH_CMT
185 This enables build of a clocksource and clockevent driver for
186 the Compare Match Timer (CMT) hardware available in 16/32/48-bit
187 variants on a wide range of Mobile and Automotive SoCs from Renesas.
190 bool "Renesas MTU2 timer driver" if COMPILE_TEST
191 depends on GENERIC_CLOCKEVENTS
192 default SYS_SUPPORTS_SH_MTU2
194 This enables build of a clockevent driver for the Multi-Function
195 Timer Pulse Unit 2 (MTU2) hardware available on SoCs from Renesas.
196 This hardware comes with 16 bit-timer registers.
199 bool "Renesas TMU timer driver" if COMPILE_TEST
200 depends on GENERIC_CLOCKEVENTS
201 default SYS_SUPPORTS_SH_TMU
203 This enables build of a clocksource and clockevent driver for
204 the 32-bit Timer Unit (TMU) hardware available on a wide range
208 bool "Renesas STI timer driver" if COMPILE_TEST
209 depends on GENERIC_CLOCKEVENTS && HAS_IOMEM
210 default SYS_SUPPORTS_EM_STI
212 This enables build of a clocksource and clockevent driver for
213 the 48-bit System Timer (STI) hardware available on a SoCs
214 such as EMEV2 from former NEC Electronics.
219 config CLKSRC_VERSATILE
220 bool "ARM Versatile (Express) reference platforms clock source"
221 depends on GENERIC_SCHED_CLOCK && !ARCH_USES_GETTIMEOFFSET
223 default y if MFD_VEXPRESS_SYSREG
225 This option enables clock source based on free running
226 counter available in the "System Registers" block of
227 ARM Versatile, RealView and Versatile Express reference
230 config CLKSRC_MIPS_GIC