clockevents: rockchip: Add rockchip timer for rk3288

The rk3288 board uses the architected timers and these ones are shutdown when
the cpu is powered down. There is a need of a broadcast timer in this case to
ensure proper wakeup when the cpus are in sleep mode and a timer expires.

This driver provides the basic timer functionnality as a backup for the local
timers at sleep time.

The timer belongs to the alive subsystem. It includes two programmables 64 bits
timer channels but the driver only uses 32bits. It works with two operations
mode: free running and user defined count.

Programing sequence:

1. Timer initialization:
 * Disable the timer by writing '0' to the CONTROLREG register
 * Program the timer mode by writing the mode to the CONTROLREG register
 * Set the interrupt mask

2. Setting the count value:
 * Load the count value to the registers COUNT0 and COUNT1 (not used).

3. Enable the timer
 * Write '1' to the CONTROLREG register with the mode (free running or user)

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>

diff --git a/Documentation/devicetree/bindings/timer/rockchip,rk3288-timer.txt b/Documentation/devicetree/bindings/timer/rockchip,rk3288-timer.txt
new file mode 100644 (file)
index 0000000..87f0b00
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/rockchip,rk3288-timer.txt
@@ -0,0 +1,18 @@
+Rockchip rk3288 timer
+
+Required properties:
+- compatible: shall be "rockchip,rk3288-timer"
+- reg: base address of the timer register starting with TIMERS CONTROL register
+- interrupts: should contain the interrupts for Timer0
+- clocks : must contain an entry for each entry in clock-names
+- clock-names : must include the following entries:
+  "timer", "pclk"
+
+Example:
+       timer: timer@ff810000 {
+               compatible = "rockchip,rk3288-timer";
+               reg = <0xff810000 0x20>;
+               interrupts = <GIC_SPI 72 IRQ_TYPE_LEVEL_HIGH>;
+               clocks = <&xin24m>, <&cru PCLK_TIMER>;
+               clock-names = "timer", "pclk";
+       };

diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
index ac5803c..5078932 100644 (file)
--- a/arch/arm/mach-rockchip/Kconfig
+++ b/arch/arm/mach-rockchip/Kconfig
@@ -11,6 +11,7 @@ config ARCH_ROCKCHIP
        select HAVE_ARM_SCU if SMP
        select HAVE_ARM_TWD if SMP
        select DW_APB_TIMER_OF
+       select ROCKCHIP_TIMER
        select ARM_GLOBAL_TIMER
        select CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
        help

diff --cc drivers/clocksource/Kconfig
Simple merge

diff --cc drivers/clocksource/Makefile
Simple merge

diff --cc drivers/clocksource/rockchip_timer.c
Simple merge