Re: [PATCH 7/7] hw/watchdog/wdt_aspeed: Reduce timer precision to micro-second

[Andrew Jeffery]

On Tue, 16 Jun 2020, at 17:21, Philippe Mathieu-Daudé wrote:
> The current implementation uses nano-second precision, while
> the watchdog can not be more precise than a micro-second.

What's the basis for this assertion? It's true for the AST2500 and AST2600, but 
the AST2400 can run the watchdog from either a 1MHz clock source or the APB 
clock (which must be at least 16.5MHz on palmetto). The reset state on the
AST2400 configures the watchdog for the APB clock rate.

The Linux driver will eventually configure the watchdog for 1MHz mode
regardless so perhaps the AST2400 reset state is a bit of a corner case, but
I feel the assertion should be watered down a bit?

Andrew