Commit 625022a5 authored by Claudiu Beznea's avatar Claudiu Beznea Committed by Daniel Lezcano

clocksource/drivers/timer-microchip-pit64b: Add Microchip PIT64B support

Add driver for Microchip PIT64B timer. Timer could be used in continuous
mode or oneshot mode. The hardware has 2x32 bit registers for period
emulating a 64 bit timer. The LSB_PR and MSB_PR registers are used to
set the period value (compare value). TLSB and TMSB keeps the current
value of the counter. After a compare the TLSB and TMSB register resets.
The driver uses PIT64B timer for clocksource or clockevent. First
requested timer would be registered as clockevent, second one would be
registered as clocksource. Individual PIT64B hardware resources were
used for clocksource and clockevent to be able to support high resolution
timers with this hardware implementation.
Signed-off-by: default avatarClaudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/1576235962-30123-3-git-send-email-claudiu.beznea@microchip.com
parent ddc61bbc
...@@ -10,6 +10,12 @@ PIT Timer required properties: ...@@ -10,6 +10,12 @@ PIT Timer required properties:
- interrupts: Should contain interrupt for the PIT which is the IRQ line - interrupts: Should contain interrupt for the PIT which is the IRQ line
shared across all System Controller members. shared across all System Controller members.
PIT64B Timer required properties:
- compatible: Should be "microchip,sam9x60-pit64b"
- reg: Should contain registers location and length
- interrupts: Should contain interrupt for PIT64B timer
- clocks: Should contain the available clock sources for PIT64B timer.
System Timer (ST) required properties: System Timer (ST) required properties:
- compatible: Should be "atmel,at91rm9200-st", "syscon", "simple-mfd" - compatible: Should be "atmel,at91rm9200-st", "syscon", "simple-mfd"
- reg: Should contain registers location and length - reg: Should contain registers location and length
......
...@@ -697,4 +697,14 @@ config INGENIC_TIMER ...@@ -697,4 +697,14 @@ config INGENIC_TIMER
help help
Support for the timer/counter unit of the Ingenic JZ SoCs. Support for the timer/counter unit of the Ingenic JZ SoCs.
config MICROCHIP_PIT64B
bool "Microchip PIT64B support"
depends on OF || COMPILE_TEST
select CLKSRC_MMIO
help
This option enables Microchip PIT64B timer for Atmel
based system. It supports the oneshot, the periodic
modes and high resolution. It is used as a clocksource
and a clockevent.
endmenu endmenu
...@@ -88,3 +88,4 @@ obj-$(CONFIG_RISCV_TIMER) += timer-riscv.o ...@@ -88,3 +88,4 @@ obj-$(CONFIG_RISCV_TIMER) += timer-riscv.o
obj-$(CONFIG_CSKY_MP_TIMER) += timer-mp-csky.o obj-$(CONFIG_CSKY_MP_TIMER) += timer-mp-csky.o
obj-$(CONFIG_GX6605S_TIMER) += timer-gx6605s.o obj-$(CONFIG_GX6605S_TIMER) += timer-gx6605s.o
obj-$(CONFIG_HYPERV_TIMER) += hyperv_timer.o obj-$(CONFIG_HYPERV_TIMER) += hyperv_timer.o
obj-$(CONFIG_MICROCHIP_PIT64B) += timer-microchip-pit64b.o
This diff is collapsed.
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment