Messages in this thread | ![/](/images/icornerl.gif) | | From | Alexander Kochetkov <> | Subject | [PATCHv2 00/11] Implement clocksource for rockchip SoC using rockchip timer | Date | Mon, 28 Nov 2016 17:31:15 +0300 |
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Hello,
This patch series contain: - devicetree bindings clarification for rockchip timers - dts files fixes for rk3228-evb, rk3229-evb and rk3188 - implementation of clocksource for rockchip SoC
The clock supplying the arm-global-timer on the rk3188 is coming from the the cpu clock itself and thus changes its rate everytime cpufreq adjusts the cpu frequency making this timer unsuitable as a stable clocksource.
The rk3188, rk3288 and following socs share a separate timer block already handled by the rockchip-timer driver. Therefore adapt this driver to also be able to act as clocksource on rk3188.
In order to test clocksource you can run following commands and check how much time it take in real. On rk3188 it take about ~45 seconds. Such error cannot be fixed using NTP. Haven't test clocksource on rk3288 and onwards. Guess they can also have unstable clocksource.
cpufreq-set -f 1.6GHZ date; sleep 60; date
Regards, Alexander.
This is try 2. Please discard all previous patches:
devicetree: https://patchwork.ozlabs.org/patch/699019/ https://patchwork.ozlabs.org/patch/699020/
kernel: https://patchwork.kernel.org/patch/9443975/ https://patchwork.kernel.org/patch/9443971/ https://patchwork.kernel.org/patch/9443959/ https://patchwork.kernel.org/patch/9443963/ https://patchwork.kernel.org/patch/9443979/ https://patchwork.kernel.org/patch/9443989/ https://patchwork.kernel.org/patch/9443987/ https://patchwork.kernel.org/patch/9443977/ https://patchwork.kernel.org/patch/9443991/
Old thread: http://lists.infradead.org/pipermail/linux-rockchip/2016-November/013147.html
Alexander Kochetkov (11): dt-bindings: clarify compatible property for rockchip timers ARM: dts: rockchip: update compatible property for rk3228 timer ARM: dts: rockchip: update compatible property for rk3229 timer ARM: dts: rockchip: add timer entries to rk3188 dtsi clocksource/drivers/rockchip_timer: split bc_timer into rk_timer and rk_clock_event_device clocksource/drivers/rockchip_timer: low level routines take rk_timer as parameter clocksource/drivers/rockchip_timer: drop unused rk_base() and rk_ctrl() clocksource/drivers/rockchip_timer: move TIMER_INT_UNMASK out of rk_timer_enable() clocksource/drivers/rockchip_timer: implement loading 64bit value into timer clocksource/drivers/rockchip_timer: implement reading 64bit value from timer clocksource/drivers/rockchip_timer: implement clocksource timer
.../bindings/timer/rockchip,rk-timer.txt | 12 +- arch/arm/boot/dts/rk3188.dtsi | 16 ++ arch/arm/boot/dts/rk3228-evb.dts | 4 + arch/arm/boot/dts/rk3229-evb.dts | 4 + drivers/clocksource/rockchip_timer.c | 202 +++++++++++++++----- 5 files changed, 184 insertions(+), 54 deletions(-)
-- 1.7.9.5
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