[PATCH] clocksource: dw_apb_timer_of: support timer-based delay
flat view
From: Daniel Lezcano <hidden>
Date: 2015-10-30 10:44:50
Also in:
lkml
On 10/30/2015 09:27 AM, Jisheng Zhang wrote:
quoted hunk ↗ jump to hunk
Implement an ARM delay timer to be used for udelay(). This allows us to skip the delay loop calibration at boot on Marvell BG2, BG2Q, BG2CD platforms. And after this patch, udelay() will be unaffected by CPU frequency changes. Signed-off-by: Jisheng Zhang <redacted> --- drivers/clocksource/Kconfig | 10 ++++++++++ drivers/clocksource/dw_apb_timer_of.c | 16 ++++++++++++++++ 2 files changed, 26 insertions(+)diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index a7726db..7b081805 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig@@ -29,6 +29,16 @@ config DW_APB_TIMER_OF select DW_APB_TIMER select CLKSRC_OF +config DW_APB_TIMER_BASED_DELAY + bool "DW APB timer based delay" + depends on ARM && DW_APB_TIMER_OF + default n + help + This option enables support for using the DW APB timer to + implement timer-based delay. It is useful for skiping the + delay loop calibration at boot on some platforms. And the + udelay() will be unaffected by CPU frequency changes. +
Why do you want it to be optional ? -- <http://www.linaro.org/> Linaro.org ? Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog