[PATCH v2 2/9] ARC: [dts] Introduce Timer bindings

From: Vineet Gupta
Date: Tue Mar 08 2016 - 07:27:08 EST

ARC Timers have historically been probed directly.
As precursor to start probing Timers thru DT introduce these bindings
Note that to keep series bisectable, these bindings are not yet used in
code.

Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
---
Changes v1 -> v2
- snps,arc-timer[0-1] folded into single snps-arc-timer [Rob]
- Node name in DT example fixed: [Rob]
"timer1: timer_clksrc {" -> timer@1 {
- Introduced 64bit RTC in skeleton_hs.dtsi [Vineet]

v1:
- http://lists.infradead.org/pipermail/linux-snps-arc/2016-February/000447.html

Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
---
.../devicetree/bindings/timer/snps,arc-timer.txt | 26 ++++++++++++++++++++++
.../devicetree/bindings/timer/snps,archs-gfrc.txt | 14 ++++++++++++
.../devicetree/bindings/timer/snps,archs-rtc.txt | 14 ++++++++++++
arch/arc/boot/dts/abilis_tb10x.dtsi | 14 ++++++++++++
arch/arc/boot/dts/skeleton.dtsi | 14 ++++++++++++
arch/arc/boot/dts/skeleton_hs.dtsi | 20 +++++++++++++++++
arch/arc/boot/dts/skeleton_hs_idu.dtsi | 14 ++++++++++++
7 files changed, 116 insertions(+)
create mode 100644 Documentation/devicetree/bindings/timer/snps,arc-timer.txt
create mode 100644 Documentation/devicetree/bindings/timer/snps,archs-gfrc.txt
create mode 100644 Documentation/devicetree/bindings/timer/snps,archs-rtc.txt

diff --git a/Documentation/devicetree/bindings/timer/snps,arc-timer.txt b/Documentation/devicetree/bindings/timer/snps,arc-timer.txt
new file mode 100644
index 000000000000..9e02be24e805
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/snps,arc-timer.txt
@@ -0,0 +1,26 @@
+Synopsys ARC Local Timer with Interrupt Capabilities
+- Found on all ARC CPUs (ARC700/ARCHS)
+- Can be optionally programmed to interrupt on Limit
+- Two idential copies TIMER0 and TIMER1 exist in ARC cores and historically
+ TIMER0 used as clockevent provider (true for all ARC cores)
+ TIMER1 used for clocksource (mandatory for ARC700, optional for ARC HS)
+
+Required properties:
+
+- compatible : should be "snps,arc-timer"
+- interrupts : single Interrupt going into parent intc
+ (16 for ARCHS cores, 3 for ARC700 cores)
+- clocks : phandle to the source clock
+
+Optional properties:
+
+- interrupt-parent : phandle to parent intc
+
+Example:
+
+ timer@0 {
+ compatible = "snps,arc-timer0";
+ interrupts = <3>;
+ interrupt-parent = <&core_intc>;
+ clocks = <&core_clk>;
+ };
diff --git a/Documentation/devicetree/bindings/timer/snps,archs-gfrc.txt b/Documentation/devicetree/bindings/timer/snps,archs-gfrc.txt
new file mode 100644
index 000000000000..aaab100f54e7
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/snps,archs-gfrc.txt
@@ -0,0 +1,14 @@
+Synopsys ARC Free Running 64-bit Global Timer for ARC HS CPUs
+- clocksource provider for SMP SoC
+
+Required properties:
+
+- compatible : should be "snps,archs-gfrc"
+- clocks : phandle to the source clock
+
+Example:
+
+ timer@1 {
+ compatible = "snps,archs-gfrc";
+ clocks = <&core_clk>;
+ };
diff --git a/Documentation/devicetree/bindings/timer/snps,archs-rtc.txt b/Documentation/devicetree/bindings/timer/snps,archs-rtc.txt
new file mode 100644
index 000000000000..13f756fa1d6d
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/snps,archs-rtc.txt
@@ -0,0 +1,14 @@
+Synopsys ARC Free Running 64-bit Local Timer for ARC HS CPUs
+- clocksource provider for UP SoC
+
+Required properties:
+
+- compatible : should be "snps,archs-rtc"
+- clocks : phandle to the source clock
+
+Example:
+
+ timer@1 {
+ compatible = "snps,arc-rtc";
+ clocks = <&core_clk>;
+ };
diff --git a/arch/arc/boot/dts/abilis_tb10x.dtsi b/arch/arc/boot/dts/abilis_tb10x.dtsi
index cfb5052239a1..eadbe71dfa22 100644
--- a/arch/arc/boot/dts/abilis_tb10x.dtsi
+++ b/arch/arc/boot/dts/abilis_tb10x.dtsi
@@ -35,6 +35,20 @@
};
};

+ /* TIMER0 with interrupt for clockevent */
+ timer@0 {
+ compatible = "snps,arc-timer";
+ interrupts = <3>;
+ interrupt-parent = <&intc>;
+ clocks = <&cpu_clk>;
+ };
+
+ /* TIMER1 for free running clocksource */
+ timer@1 {
+ compatible = "snps,arc-timer";
+ clocks = <&cpu_clk>;
+ };
+
soc100 {
#address-cells = <1>;
#size-cells = <1>;
diff --git a/arch/arc/boot/dts/skeleton.dtsi b/arch/arc/boot/dts/skeleton.dtsi
index 296d371a335c..f6109c2feba7 100644
--- a/arch/arc/boot/dts/skeleton.dtsi
+++ b/arch/arc/boot/dts/skeleton.dtsi
@@ -30,6 +30,20 @@
};
};

+ /* TIMER0 with interrupt for clockevent */
+ timer@0 {
+ compatible = "snps,arc-timer";
+ interrupts = <3>;
+ interrupt-parent = <&core_intc>;
+ clocks = <&core_clk>;
+ };
+
+ /* TIMER1 for free running clocksource */
+ timer@1 {
+ compatible = "snps,arc-timer";
+ clocks = <&core_clk>;
+ };
+
memory {
device_type = "memory";
reg = <0x80000000 0x10000000>; /* 256M */
diff --git a/arch/arc/boot/dts/skeleton_hs.dtsi b/arch/arc/boot/dts/skeleton_hs.dtsi
index a53876669030..49caeabca37a 100644
--- a/arch/arc/boot/dts/skeleton_hs.dtsi
+++ b/arch/arc/boot/dts/skeleton_hs.dtsi
@@ -25,6 +25,26 @@
};
};

+ /* TIMER0 with interrupt for clockevent */
+ timer@0 {
+ compatible = "snps,arc-timer";
+ interrupts = <16>;
+ interrupt-parent = <&core_intc>;
+ clocks = <&core_clk>;
+ };
+
+ /* 64-bit Local RTC: preferred clocksource for UP */
+ timer@1 {
+ compatible = "snps,archs-timer-rtc";
+ clocks = <&core_clk>;
+ };
+
+ /* TIMER1 for free running clocksource: Fallback if rtc not found */
+ timer@2 {
+ compatible = "snps,arc-timer";
+ clocks = <&core_clk>;
+ };
+
memory {
device_type = "memory";
reg = <0x80000000 0x10000000>; /* 256M */
diff --git a/arch/arc/boot/dts/skeleton_hs_idu.dtsi b/arch/arc/boot/dts/skeleton_hs_idu.dtsi
index 74898d017f7a..7e301ff16200 100644
--- a/arch/arc/boot/dts/skeleton_hs_idu.dtsi
+++ b/arch/arc/boot/dts/skeleton_hs_idu.dtsi
@@ -25,6 +25,20 @@
};
};

+ /* TIMER0 with interrupt for clockevent */
+ timer@0 {
+ compatible = "snps,arc-timer";
+ interrupts = <16>;
+ interrupt-parent = <&core_intc>;
+ clocks = <&core_clk>;
+ };
+
+ /* 64-bit Global Free Running Counter */
+ timer@1 {
+ compatible = "snps,archs-timer-gfrc";
+ clocks = <&core_clk>;
+ };
+
memory {
device_type = "memory";
reg = <0x80000000 0x10000000>; /* 256M */
--
2.5.0