Messages in this thread | | | Subject | Re: [RFC PATCH] watchdog: da9062: Correct the timeout values | From | Andrej Picej <> | Date | Mon, 6 Dec 2021 08:29:04 +0100 |
| |
On 3. 12. 21 18:31, Christoph Niedermaier wrote: > From: Guenter Roeck > Sent: Friday, December 3, 2021 5:52 PM >> On 12/3/21 8:35 AM, Christoph Niedermaier wrote: >>> I measured the timeout values of my DA9061 chip. According to the >>> information in the data sheet the formula should be: >>> >>> timeout = 2.048 * 2^(regval - 1) >>> >>> But my measured values differ from that. >>> Accoring to my measured values the formula must be: >>> >>> timeout = 3.2 * 2^(regval - 1) >>> >>> Is there something wrong with my chip, or has anyone else noticed this as well? >> >> The driver assumes a static and well defined clock rate. Maybe that rate >> is different in your system (if that is possible) ? >> >> Guenter > > @Andrej > Do the values in the driver match what your chip does? >
Just did a quick test. The values in the driver match what the chip does. I checked multiple timeouts 16, 32, 65 and 131 seconds. The timeout triggers quite accurately.
> I have not changed anything. After power on, the chip behaves like this. > So I guess it either come from an OTP value or the wiring outside the chip. > Does anyone know what needs to be checked?
Can't help you here, sorry.
Best regards, Andrej
| |