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
52 config CADENCE_TTC_TIMER
55 config CLKSRC_NOMADIK_MTU
57 depends on (ARCH_NOMADIK || ARCH_U8500)
60 Support for Multi Timer Unit. MTU provides access
61 to multiple interrupt generating programmable
62 32-bit free running decrementing counters.
64 config CLKSRC_NOMADIK_MTU_SCHED_CLOCK
66 depends on CLKSRC_NOMADIK_MTU
68 Use the Multi Timer Unit as the sched_clock.
70 config CLKSRC_DBX500_PRCMU
71 bool "Clocksource PRCMU Timer"
72 depends on UX500_SOC_DB8500
75 Use the always on PRCMU Timer as clocksource
77 config CLKSRC_DBX500_PRCMU_SCHED_CLOCK
78 bool "Clocksource PRCMU Timer sched_clock"
79 depends on (CLKSRC_DBX500_PRCMU && !CLKSRC_NOMADIK_MTU_SCHED_CLOCK)
82 Use the always on PRCMU Timer as sched_clock
85 bool "Clocksource for Energy Micro's EFM32 SoCs" if !ARCH_EFM32
86 depends on OF && ARM && (ARCH_EFM32 || COMPILE_TEST)
90 Support to use the timers of EFM32 SoCs as clock source and clock
95 select CLKSRC_OF if OF
97 config ARM_ARCH_TIMER_EVTSTREAM
98 bool "Support for ARM architected timer event stream generation"
99 default y if ARM_ARCH_TIMER
100 depends on ARM_ARCH_TIMER
102 This option enables support for event stream generation based on
103 the ARM architected timer. It is used for waking up CPUs executing
104 the wfe instruction at a frequency represented as a power-of-2
105 divisor of the clock rate.
106 The main use of the event stream is wfe-based timeouts of userspace
107 locking implementations. It might also be useful for imposing timeout
108 on wfe to safeguard against any programming errors in case an expected
109 event is not generated.
110 This must be disabled for hardware validation purposes to detect any
111 hardware anomalies of missing events.
113 config ARM_GLOBAL_TIMER
115 select CLKSRC_OF if OF
117 This options enables support for the ARM global timer unit
119 config CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
121 depends on ARM_GLOBAL_TIMER
124 Use ARM global timer clock source as sched_clock
127 select CLKSRC_OF if OF
128 def_bool SOC_AT91SAM9 || SOC_SAMA5
130 config CLKSRC_METAG_GENERIC
133 This option enables support for the Meta per-thread timers.
135 config CLKSRC_EXYNOS_MCT
136 def_bool y if ARCH_EXYNOS
139 Support for Multi Core Timer controller on Exynos SoCs.
141 config CLKSRC_SAMSUNG_PWM
144 This is a new clocksource driver for the PWM timer found in
145 Samsung S3C, S5P and Exynos SoCs, replacing an earlier driver
146 for all devicetree enabled platforms. This driver will be
147 needed only on systems that do not have the Exynos MCT available.
152 Support for Freescale FlexTimer Module (FTM) timer.
157 Support for Period Interrupt Timer on Freescale Vybrid Family SoCs.
159 config SYS_SUPPORTS_SH_CMT
167 config SYS_SUPPORTS_SH_MTU2
170 config SYS_SUPPORTS_SH_TMU
173 config SYS_SUPPORTS_EM_STI
177 bool "Renesas CMT timer driver" if COMPILE_TEST
178 depends on GENERIC_CLOCKEVENTS
179 default SYS_SUPPORTS_SH_CMT
181 This enables build of a clocksource and clockevent driver for
182 the Compare Match Timer (CMT) hardware available in 16/32/48-bit
183 variants on a wide range of Mobile and Automotive SoCs from Renesas.
186 bool "Renesas MTU2 timer driver" if COMPILE_TEST
187 depends on GENERIC_CLOCKEVENTS
188 default SYS_SUPPORTS_SH_MTU2
190 This enables build of a clockevent driver for the Multi-Function
191 Timer Pulse Unit 2 (MTU2) hardware available on SoCs from Renesas.
192 This hardware comes with 16 bit-timer registers.
195 bool "Renesas TMU timer driver" if COMPILE_TEST
196 depends on GENERIC_CLOCKEVENTS
197 default SYS_SUPPORTS_SH_TMU
199 This enables build of a clocksource and clockevent driver for
200 the 32-bit Timer Unit (TMU) hardware available on a wide range
204 bool "Renesas STI timer driver" if COMPILE_TEST
205 depends on GENERIC_CLOCKEVENTS && HAS_IOMEM
206 default SYS_SUPPORTS_EM_STI
208 This enables build of a clocksource and clockevent driver for
209 the 48-bit System Timer (STI) hardware available on a SoCs
210 such as EMEV2 from former NEC Electronics.
215 config CLKSRC_VERSATILE
216 bool "ARM Versatile (Express) reference platforms clock source"
217 depends on GENERIC_SCHED_CLOCK && !ARCH_USES_GETTIMEOFFSET
219 default y if MFD_VEXPRESS_SYSREG
221 This option enables clock source based on free running
222 counter available in the "System Registers" block of
223 ARM Versatile, RealView and Versatile Express reference