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
53 config CADENCE_TTC_TIMER
56 config CLKSRC_NOMADIK_MTU
58 depends on (ARCH_NOMADIK || ARCH_U8500)
61 Support for Multi Timer Unit. MTU provides access
62 to multiple interrupt generating programmable
63 32-bit free running decrementing counters.
65 config CLKSRC_NOMADIK_MTU_SCHED_CLOCK
67 depends on CLKSRC_NOMADIK_MTU
69 Use the Multi Timer Unit as the sched_clock.
71 config CLKSRC_DBX500_PRCMU
72 bool "Clocksource PRCMU Timer"
73 depends on UX500_SOC_DB8500
76 Use the always on PRCMU Timer as clocksource
78 config CLKSRC_DBX500_PRCMU_SCHED_CLOCK
79 bool "Clocksource PRCMU Timer sched_clock"
80 depends on (CLKSRC_DBX500_PRCMU && !CLKSRC_NOMADIK_MTU_SCHED_CLOCK)
83 Use the always on PRCMU Timer as sched_clock
86 bool "Clocksource for Energy Micro's EFM32 SoCs" if !ARCH_EFM32
87 depends on OF && ARM && (ARCH_EFM32 || COMPILE_TEST)
91 Support to use the timers of EFM32 SoCs as clock source and clock
96 select CLKSRC_OF if OF
98 config ARM_ARCH_TIMER_EVTSTREAM
99 bool "Support for ARM architected timer event stream generation"
100 default y if ARM_ARCH_TIMER
101 depends on ARM_ARCH_TIMER
103 This option enables support for event stream generation based on
104 the ARM architected timer. It is used for waking up CPUs executing
105 the wfe instruction at a frequency represented as a power-of-2
106 divisor of the clock rate.
107 The main use of the event stream is wfe-based timeouts of userspace
108 locking implementations. It might also be useful for imposing timeout
109 on wfe to safeguard against any programming errors in case an expected
110 event is not generated.
111 This must be disabled for hardware validation purposes to detect any
112 hardware anomalies of missing events.
114 config ARM_GLOBAL_TIMER
116 select CLKSRC_OF if OF
118 This options enables support for the ARM global timer unit
120 config CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
122 depends on ARM_GLOBAL_TIMER
125 Use ARM global timer clock source as sched_clock
128 select CLKSRC_OF if OF
129 def_bool SOC_AT91SAM9 || SOC_SAMA5
131 config CLKSRC_METAG_GENERIC
134 This option enables support for the Meta per-thread timers.
136 config CLKSRC_EXYNOS_MCT
137 def_bool y if ARCH_EXYNOS
140 Support for Multi Core Timer controller on Exynos SoCs.
142 config CLKSRC_SAMSUNG_PWM
145 This is a new clocksource driver for the PWM timer found in
146 Samsung S3C, S5P and Exynos SoCs, replacing an earlier driver
147 for all devicetree enabled platforms. This driver will be
148 needed only on systems that do not have the Exynos MCT available.
153 Support for Freescale FlexTimer Module (FTM) timer.
158 Support for Period Interrupt Timer on Freescale Vybrid Family SoCs.
160 config SYS_SUPPORTS_SH_CMT
168 config SYS_SUPPORTS_SH_MTU2
171 config SYS_SUPPORTS_SH_TMU
174 config SYS_SUPPORTS_EM_STI
178 bool "Renesas CMT timer driver" if COMPILE_TEST
179 depends on GENERIC_CLOCKEVENTS
180 default SYS_SUPPORTS_SH_CMT
182 This enables build of a clocksource and clockevent driver for
183 the Compare Match Timer (CMT) hardware available in 16/32/48-bit
184 variants on a wide range of Mobile and Automotive SoCs from Renesas.
187 bool "Renesas MTU2 timer driver" if COMPILE_TEST
188 depends on GENERIC_CLOCKEVENTS
189 default SYS_SUPPORTS_SH_MTU2
191 This enables build of a clockevent driver for the Multi-Function
192 Timer Pulse Unit 2 (MTU2) hardware available on SoCs from Renesas.
193 This hardware comes with 16 bit-timer registers.
196 bool "Renesas TMU timer driver" if COMPILE_TEST
197 depends on GENERIC_CLOCKEVENTS
198 default SYS_SUPPORTS_SH_TMU
200 This enables build of a clocksource and clockevent driver for
201 the 32-bit Timer Unit (TMU) hardware available on a wide range
205 bool "Renesas STI timer driver" if COMPILE_TEST
206 depends on GENERIC_CLOCKEVENTS && HAS_IOMEM
207 default SYS_SUPPORTS_EM_STI
209 This enables build of a clocksource and clockevent driver for
210 the 48-bit System Timer (STI) hardware available on a SoCs
211 such as EMEV2 from former NEC Electronics.
216 config CLKSRC_VERSATILE
217 bool "ARM Versatile (Express) reference platforms clock source"
218 depends on GENERIC_SCHED_CLOCK && !ARCH_USES_GETTIMEOFFSET
220 default y if MFD_VEXPRESS_SYSREG
222 This option enables clock source based on free running
223 counter available in the "System Registers" block of
224 ARM Versatile, RealView and Versatile Express reference
227 config CLKSRC_MIPS_GIC