[PATCH linux dev-4.10 v3 2/4] dt-bindings: watchdog: aspeed: External reset signal properties

[Joel Stanley]

On Thu, Jul 27, 2017 at 7:46 PM, Andrew Jeffery <andrew at aj.id.au> wrote:
> For the AST2500 and compatible watchdog controllers the external reset
> signal can be configured for push-pull or open-drain drive types, and in
> the case of open-drain driving, active low or high.

In addition to this we should document the pinctrl phandle: the fact
that it exists, but more importantly how that interacts with the
hardware.

>
> Signed-off-by: Andrew Jeffery <andrew at aj.id.au>
> ---
>  Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> index f526b003b2e0..7aa885f620ef 100644
> --- a/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> +++ b/Documentation/devicetree/bindings/watchdog/aspeed-wdt.txt
> @@ -36,10 +36,18 @@ Optional properties:
>   - aspeed,interrupt:   If property is present then interrupt CPU.
>                         If not specified then don't interrupt CPU.
>
> + - aspeed,alt-boot:    If property is present then boot from alternate block.
>   - aspeed,external-signal: If property is present then signal is sent to
>                         external reset counter (only WDT1 and WDT2). If not
>                         specified no external signal is sent.
> - - aspeed,alt-boot:    If property is present then boot from alternate block.
> + - aspeed,ext-pulse-duration: External signal pulse duration in microseconds
> +
> +Optional properties for AST2500-compatible watchdogs:
> + - aspeed,ext-push-pull: If aspeed,external-signal is present, set the pin's
> +                        drive type to push-pull. The default is open-drain.
> + - aspeed,ext-active-high: If aspeed,external-signal is present and and the pin
> +                          is configured as push-pull, then set the pulse
> +                          polarity to active-high. The default is active-low.
>
>  Example:
>
> --
> 2.11.0
>