Re: [PATCH 1/4] clocksource: Add brcm,bcm6345-timer device tree binding

Rob Herring
2015-11-22T22:12:37Z

On Sat, Nov 21, 2015 at 07:02:46PM +0000, Simon Arlott wrote:
> Add device tree binding for the BCM6345 timer. This is required for the
> BCM6345 watchdog which needs to respond to one of the timer interrupts.
>
> Signed-off-by: Simon Arlott <simon@fire.lp0.eu>

One minor nit, otherwise:

Acked-by: Rob Herring <robh@kernel.org>

> ---
> .../bindings/timer/brcm,bcm6345-timer.txt | 57 ++++++++++++++++++++++
> 1 file changed, 57 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/timer/brcm,bcm6345-timer.txt
>
> diff --git a/Documentation/devicetree/bindings/timer/brcm,bcm6345-timer.txt b/Documentation/devicetree/bindings/timer/brcm,bcm6345-timer.txt
> new file mode 100644
> index 0000000..2593907
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/brcm,bcm6345-timer.txt
> @@ -0,0 +1,57 @@
> +Broadcom BCM6345 Timer
> +
> +This block is a timer that is connected to one interrupt on the main interrupt
> +controller and functions as a programmable interrupt controller for timer events.
> +
> +- 3 to 4 independent timers with their own maskable level interrupt bit (but not
> + per CPU because there is only one parent interrupt and the timers share it)
> +
> +- 1 watchdog timer with an unmaskable level interrupt
> +
> +- Contains one enable/status word pair
> +
> +- No atomic set/clear operations
> +
> +The lack of per CPU ability of timers makes them unusable as a set of
> +clockevent devices, otherwise they could be attached to the remaining
> +interrupts.
> +
> +The BCM6318 also has a separate interrupt for every timer except the watchdog.
> +
> +Required properties:
> +
> +- compatible: should be "brcm,bcm<soc>-timer", "brcm,bcm6345-timer"
> +- reg: specifies the base physical address and size of the registers, excluding
> + the watchdog registers
> +- interrupt-controller: identifies the node as an interrupt controller
> +- #interrupt-cells: specifies the number of cells needed to encode an interrupt
> + source, should be 1.
> +- interrupt-parent: specifies the phandle to the parent interrupt controller(s)
> + this one is cascaded from
> +- interrupts: specifies the interrupt line(s) in the interrupt-parent controller
> + node for the main timer interrupt, followed by the individual timer interrupts
> + if present; valid values depend on the type of parent interrupt controller
> +
> +Example:
> +
> +timer: timer@0x10000080 {

Drop the '0x'

> + compatible = "brcm,bcm63168-timer", "brcm,bcm6345-timer";
> + reg = <0x10000080 0x1c>;
> +
> + interrupt-controller;
> + #interrupt-cells = <1>;
> +
> + interrupt-parent = <&periph_intc>;
> + interrupts = <0>;
> +};
> +
> +timer: timer@0x10000040 {

Ditto.

> + compatible = "brcm,bcm6318-timer", "brcm,bcm6345-timer";
> + reg = <0x10000040 0x28>;
> +
> + interrupt-controller;
> + #interrupt-cells = <1>;
> +
> + interrupt-parent = <&periph_intc>;
> + interrupts = <31>, <0>, <1>, <2>, <3>;
> +};
> --
> 2.1.4
>
> --
> Simon Arlott