Hi Vineet,
On Tue, 2016-02-02 at 16:28 +0530, Vineet Gupta wrote:
> ARC Timers have historically been probed directly.
> As precursor to start probing Timers thru DT introduce these bindings
>
> Cc: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
> Cc: Rob Herring <robh@xxxxxxxxxx>
> Cc: devicetree@xxxxxxxxxxxxxxx
> Signed-off-by: Vineet Gupta <vgupta@xxxxxxxxxxxx>
> ---
[snip]
> diff --git a/Documentation/devicetree/bindings/timer/snps,arc-timer0.txt
> b/Documentation/devicetree/bindings/timer/snps,arc-timer0.txt
> new file mode 100644
> index 000000000000..ceb80c72a90b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/snps,arc-timer0.txt
> @@ -0,0 +1,23 @@
> +Synopsys ARC Local Timer with Interrupt Capabilities
> +- Found on all ARC CPUs (ARC700/ARCHS)
> +- Mandatory clockevent provider
> +
> +Required properties:
> +
> +- compatible : should be "snps,arc-timer0"
> +- interrupts : single Interrupt going into parent intc
> + (16 for ARCHS cores, 3 for ARC700 cores)
> +- clocks : phandle to the source clock
Actually we're not flexible here.
See we have hard-coded "core_clk" in [PATCH 8/9].
We use it directly in show_cpuinfo() for reading clock speed
as well as in axs103_early_init().
So "source clock" here MUST be "core_clk", otherwise
/proc/cpuinfo will report junk instead of meaningful data at least.
> +
> +Optional properties:
> +
> +- interrupt-parent : phandle to parent intc
> +
> +Example:
> +
> + timer0: timer_clkevt {
> + compatible = "snps,arc-timer0";
> + interrupts = <3>;
> + interrupt-parent = <&core_intc>;
> + clocks = <&timer0_clk>;
> + };
> diff --git a/Documentation/devicetree/bindings/timer/snps,arc-timer1.txt
> b/Documentation/devicetree/bindings/timer/snps,arc-timer1.txt
> new file mode 100644
> index 000000000000..4886192ce2f2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/snps,arc-timer1.txt
> @@ -0,0 +1,17 @@
> +Synopsys ARC Free Running Local 32-bit Timer
> +- Found on all ARC CPUs (ARC700/ARCHS)
> +- Mandatory clocksource provider on ARC700
> +- Optional clocksource provider on UP ARC HS CPUs
> + (and if better timer archs-rtc not available in SoC)
> +
> +Required properties:
> +
> +- compatible : should be "snps,arc-timer1"
> +- clocks : phandle to the source clock
> +
> +Example:
> +
> + timer1: timer_clksrc {
> + compatible = "snps,arc-timer1";
> + clocks = <&timer0_clk>;
Ditto, "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..cce60e16aa0d
> --- /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
> +- clocksourc provider for SMP SoC
> +
> +Required properties:
> +
> +- compatible : should be "snps,archs-gfrc"
> +- clocks : phandle to the source clock
> +
> +Example:
> +
> + timer1: timer_clksrc {
> + compatible = "snps,archs-gfrc";
> + clocks = <&timer0_clk>;
Ditto, "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..f3b49938812b
> --- /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
> +- clocksourc provider for UP SoC
> +
> +Required properties:
> +
> +- compatible : should be "snps,archs-rtc"
> +- clocks : phandle to the source clock
> +
> +Example:
> +
> + timer1: timer_clksrc {
> + compatible = "snps,arc-rtc";
> + clocks = <&timer0_clk>;
> + };
> diff --git a/arch/arc/boot/dts/abilis_tb10x.dtsi b/arch/arc/boot/dts/abilis_tb10x.dtsi
> index cfb5052239a1..f9f138efa92c 100644
> --- a/arch/arc/boot/dts/abilis_tb10x.dtsi
> +++ b/arch/arc/boot/dts/abilis_tb10x.dtsi
> @@ -35,6 +35,18 @@
> };
> };
>
> + timer0: timer_clkevt {
> + compatible = "snps,arc-timer0";
> + interrupts = <3>;
> + interrupt-parent = <&intc>;
> + clocks = <&cpu_clk>;
>
> + };
> +
> + timer1: timer_clksrc {
> + compatible = "snps,arc-timer1";
> + clocks = <&cpu_clk>;
> + };
> +
Hm now that's a question how to fix /proc/cpuinfo output
for Abilis? There's no "core_clk" DTS node for Abilis and so
show_cpuinfo() won't get proper clock value.
Probably we may fix it with modification of their "pll" node
from
------------------------>8----------------------
pll0: oscillator {
clock-frequency = <1000000000>;
};
------------------------>8----------------------
to
------------------------>8----------------------
core_clk: oscillator {
clock
-frequency = <1000000000>;
};
------------------------>8----------------------
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