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
124 select CLKSRC_OF if OF
125 def_bool SOC_AT91SAM9 || SOC_SAMA5
127 config CLKSRC_METAG_GENERIC
130 This option enables support for the Meta per-thread timers.
132 config CLKSRC_EXYNOS_MCT
133 def_bool y if ARCH_EXYNOS
136 Support for Multi Core Timer controller on Exynos SoCs.
138 config CLKSRC_SAMSUNG_PWM
141 This is a new clocksource driver for the PWM timer found in
142 Samsung S3C, S5P and Exynos SoCs, replacing an earlier driver
143 for all devicetree enabled platforms. This driver will be
144 needed only on systems that do not have the Exynos MCT available.
149 Support for Freescale FlexTimer Module (FTM) timer.
154 Support for Period Interrupt Timer on Freescale Vybrid Family SoCs.
156 config SYS_SUPPORTS_SH_CMT
164 config SYS_SUPPORTS_SH_MTU2
167 config SYS_SUPPORTS_SH_TMU
170 config SYS_SUPPORTS_EM_STI
174 bool "Renesas CMT timer driver" if COMPILE_TEST
175 depends on GENERIC_CLOCKEVENTS
176 default SYS_SUPPORTS_SH_CMT
178 This enables build of a clocksource and clockevent driver for
179 the Compare Match Timer (CMT) hardware available in 16/32/48-bit
180 variants on a wide range of Mobile and Automotive SoCs from Renesas.
183 bool "Renesas MTU2 timer driver" if COMPILE_TEST
184 depends on GENERIC_CLOCKEVENTS
185 default SYS_SUPPORTS_SH_MTU2
187 This enables build of a clockevent driver for the Multi-Function
188 Timer Pulse Unit 2 (MTU2) hardware available on SoCs from Renesas.
189 This hardware comes with 16 bit-timer registers.
192 bool "Renesas TMU timer driver" if COMPILE_TEST
193 depends on GENERIC_CLOCKEVENTS
194 default SYS_SUPPORTS_SH_TMU
196 This enables build of a clocksource and clockevent driver for
197 the 32-bit Timer Unit (TMU) hardware available on a wide range
201 bool "Renesas STI timer driver" if COMPILE_TEST
202 depends on GENERIC_CLOCKEVENTS && HAS_IOMEM
203 default SYS_SUPPORTS_EM_STI
205 This enables build of a clocksource and clockevent driver for
206 the 48-bit System Timer (STI) hardware available on a SoCs
207 such as EMEV2 from former NEC Electronics.
212 config CLKSRC_VERSATILE
213 bool "ARM Versatile (Express) reference platforms clock source"
214 depends on GENERIC_SCHED_CLOCK && !ARCH_USES_GETTIMEOFFSET
216 default y if MFD_VEXPRESS_SYSREG
218 This option enables clock source based on free running
219 counter available in the "System Registers" block of
220 ARM Versatile, RealView and Versatile Express reference