On Wednesday 21 May 2014 17:27:31 Ivan Khoronzhuk wrote:
> This node is intended to allow SoC reset in case of software reset
> or appropriate watchdogs.
>
> The Keystone SoCs can contain up to 4 watchdog timers to reset
> SoC. Each watchdog timer event input is connected to the Reset Mux
> block. The Reset Mux block can be configured to cause reset or not.
>
> Additionally soft or hard reset can be configured.
>
> Signed-off-by: Ivan Khoronzhuk <[email protected]>
> ---
> .../bindings/power/reset/keystone-reset.txt | 66
> ++++++++++++++++++++++
> 1 file changed, 66 insertions(+)
> create mode 100644
> Documentation/devicetree/bindings/power/reset/keystone-reset.txt
>
> diff --git a/Documentation/devicetree/bindings/power/reset/keystone-reset.txt
> b/Documentation/devicetree/bindings/power/reset/keystone-reset.txt
> new file mode 100644
> index 0000000..64cb7b4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/reset/keystone-reset.txt
> @@ -0,0 +1,66 @@
> +* Device tree bindings for Texas Instruments keystone reset
> +
> +This node is intended to allow SoC reset in case of software reset
> +of selected watchdogs.
> +
> +The Keystone SoCs can contain up to 4 watchdog timers to reset
> +SoC. Each watchdog timer event input is connected to the Reset Mux
> +block. The Reset Mux block can be configured to cause reset or not.
> +
> +Additionally soft or hard reset can be configured.
> +
> +Required properties:
> +
> +- compatible: ti,keystone-reset
> +
> +- ti,syscon-pll: syscon register range used to access pll controller
> + registers in order to use reset control registers.
> +
> +- ti,syscon-dev: syscon register range used to access device state
> + control registers in order to use mux block registers
> + for all watchdogs.
This should be updated to call these phandles rather than register ranges.
> +Optional properties:
> +
> +- ti,soft-reset: Boolean option indicating soft reset.
> + By default hard reset is used.
> +
> +- ti,wdt_list: WDT list that can cause SoC reset. It's not
> related
> + to WDT driver, it's just needed to enable a SoC related
> + reset that's triggered by one of WDTs. The list is
> + in format: <0>, <2>; It can be in random order and
> + begins from 0 to 3, as keystone can contain up to 4 SoC
> + reset watchdogs and can be in random order.
> +
> +Example 1:
> +Setup keystone reset so that in case software reset or
> +WDT0 is triggered it issues hard reset for SoC.
> +
> +pllctrl: pll_controller {
> + compatible = "syscon";
> + reg = <0x2310000 0x200>;
> +};
> +
> +devctrl: device_state_control {
> + compatible = "syscon";
> + reg = <0x2620000 0x1000>;
> +};
It's ok to have these in the example, but please also add a binding file
for each one describing what they are, and add a proper "compatible" string
so they can be matched by a high-level device driver if needed.
This could for instance be
compatible = "ti,keystone-1.0-pll-controller", "syscon";
Arnd
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