Re: [PATCH v2 2/2] clocksource/drivers/mtk_systimer: Add support for Mediatek SoCs

On Wed, 2018-06-27 at 11:39 +0200, Daniel Lezcano wrote:

On 27/06/2018 09:53, Stanley Chu wrote:

quoted

This patch adds a new clock event for the timer
found on the Mediatek SoCs.

The Mediatek System Timer has several 32-bit timers.
Only one timer is used by this driver as a clock event
supporting oneshot events.

The System Timer can be run with two clocks. A 13 MHz system
clock and the RTC clock running at 32 KHz. This implementation
uses the system clock with no clock source divider.

Recent platforms have the arch_arm_timer and it will be always selected.

What is the benefit of adding this timer ?

Hi Daniel,

To save power as much as possible, our platform enables
"arch_timer_c3stop" in arch_arm_timer, and thus another always-on timer
is required for tick-broadcasting. System Timer is introduced for above
purpose.

Thanks.
Stanley Chu