ARM: bcm281xx: Add timer driver

PATCH Superseded Christian Daudt 1 participant 1 message Feb 26, 2013

Subsystems (6)

Device tree bindings Arm (32-bit) Arm sub-architectures Clocksource, clockevent drivers +2 more subsystems

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Christian Daudt

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2013-02-26 17:16 UTC #0 lore raw

PATCH v6 1/1 ARM: bcm281xx: Add timer driver

This adds support for the Broadcom timer, used in the following SoCs:
BCM11130, BCM11140, BCM11351, BCM28145, BCM28155

Updates from V5:
- Rebase to latest arm-soc/for-next

Updates from V4:
- Switch code to use CLOCKSOURCE_OF_DECLARE

Updates from V3:
- Migrate to 3.9 timer framework updates

Updates from V2:
- prepend static fns + fields with kona_

Updates from V1:
- Rename bcm_timer.c to bcm_kona_timer.c
- Pull .h into bcm_kona_timer.c
- Make timers static
- Clean up comment block
- Switched to using clockevents_config_and_register
- Added an error to the get_timer loop if it repeats too much
- Added to Documentation/devicetree/bindings/arm/bcm/bcm,kona-timer.txt
- Added missing readl to timer_disable_and_clear

Note: bcm,kona-timer was kept as the 'compatible' field to make it specific enough for when there are multiple bcm timers (bcm,timer is too generic).

Signed-off-by Christian Daudt <[email protected]>

Acked-by Arnd Bergmann <[email protected]>

Acked-by John Stultz <[email protected]>

Reviewed-by Stephen Warren <[email protected]>

Documentation/devicetree/bindings/arm/bcm/bcm,kona-timer.txt new file +19 -0

new file mode 100644
index 0000000..59fa6e6
@@ -0,0 +1,19 @@
+Broadcom Kona Family timer
+-----------------------------------------------------
+This timer is used in the following Broadcom SoCs:
+ BCM11130, BCM11140, BCM11351, BCM28145, BCM28155
+
+Required properties:
+- compatible : "bcm,kona-timer"
+- reg : Register range for the timer
+- interrupts : interrupt for the timer
+- clock-frequency: frequency that the clock operates
+
+Example:
+	timer at 35006000 {
+		compatible = "bcm,kona-timer";
+		reg = <0x35006000 0x1000>;
+		interrupts = <0x0 7 0x4>;
+		clock-frequency = <32768>;
+	};
+

arch/arm/boot/dts/bcm11351.dtsi +8 -0

index ad13588..8f71f40 100644
@@ -47,4 +47,12 @@
 		    cache-unified;
 		    cache-level = <2>;
 	};
+
+	timer at 35006000 {
+		compatible = "bcm,kona-timer";
+		reg = <0x35006000 0x1000>;
+		interrupts = <0x0 7 0x4>;
+		clock-frequency = <32768>;
+	};
+
 };

arch/arm/mach-bcm/Kconfig +1 -0

index bf02471..f112895 100644
@@ -6,6 +6,7 @@ config ARCH_BCM
 	select ARM_ERRATA_764369 if SMP
 	select ARM_GIC
 	select CPU_V7
+	select CLKSRC_OF
 	select GENERIC_CLOCKEVENTS
 	select GENERIC_TIME
 	select GPIO_BCM

arch/arm/mach-bcm/board_bcm.c +2 -5

index f0f9aba..2595935 100644
@@ -16,14 +16,11 @@
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/irqchip.h>
+#include <linux/clocksource.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/time.h>
 
-static void timer_init(void)
-{
-}
-
 
 static void __init board_init(void)
 {

@@ -35,7 +32,7 @@ static const char * const bcm11351_dt_compat[] = { "bcm,bcm11351", NULL, };
 
 DT_MACHINE_START(BCM11351_DT, "Broadcom Application Processor")
 	.init_irq = irqchip_init,
-	.init_time = timer_init,
+	.init_time = clocksource_of_init,
 	.init_machine = board_init,
 	.dt_compat = bcm11351_dt_compat,
 MACHINE_END

drivers/clocksource/Makefile +1 -0

index 7d671b8..5b4a33a 100644
@@ -19,5 +19,6 @@ obj-$(CONFIG_ARCH_BCM2835)	+= bcm2835_timer.o
 obj-$(CONFIG_SUNXI_TIMER)	+= sunxi_timer.o
 obj-$(CONFIG_ARCH_TEGRA)	+= tegra20_timer.o
 obj-$(CONFIG_VT8500_TIMER)	+= vt8500_timer.o
+obj-$(CONFIG_ARCH_BCM)		+= bcm_kona_timer.o
 
 obj-$(CONFIG_ARM_ARCH_TIMER)		+= arm_arch_timer.o

drivers/clocksource/bcm_kona_timer.c new file +211 -0

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Signature · 1 line

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