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Subject[PATCHv2 00/11] Implement clocksource for rockchip SoC using rockchip timer
Date
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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