On Thu, 2020-11-05 at 13:38 +0200, Matti Vaittinen wrote:
> Add Watchdog support for ROHM BD9576MUF and BD9573MUF PMICs which are
> mainly used to power the R-Car series processors. The watchdog is
> pinged using a GPIO and enabled using another GPIO. Additionally
> watchdog time-out can be configured to HW prior starting the
> watchdog.
> Watchdog timeout can be configured to detect only delayed ping or in
> a window mode where also too fast pings are detected.
>
> Signed-off-by: Matti Vaittinen <matti.vaittinen@xxxxxxxxxxxxxxxxx>
> Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> ---
>
//snip
> + ret = of_property_read_variable_u32_array(np, "rohm,hw-timeout-
> ms",
> + &hw_margin[0], 1, 2);
> + if (ret < 0 && ret != -EINVAL)
> + return ret;
> +
> + if (ret == 1)
> + hw_margin_max = hw_margin[0];
> +
> + if (ret == 2) {
> + hw_margin_max = hw_margin[1];
> + hw_margin_min = hw_margin[0];
> + }
> +
> + ret = bd957x_set_wdt_mode(priv, hw_margin_max, hw_margin_min);
> + if (ret)
> + return ret;
> +
> + priv->always_running = of_property_read_bool(np, "always-
> running");
> +
> + watchdog_set_drvdata(&priv->wdd, priv);
> +
> + priv->wdd.info = &bd957x_wdt_ident;
> + priv->wdd.ops = &bd957x_wdt_ops;
> + priv->wdd.min_hw_heartbeat_ms = hw_margin_min;
> + priv->wdd.max_hw_heartbeat_ms = hw_margin_max;
> + priv->wdd.parent = dev;
> + priv->wdd.timeout = (hw_margin_max / 2) * 1000;
Hmm. Just noticed this value does not make sense, right?
Maximum hw_margin is 4416 ms. If I read this correctly timeout should
be in seconds - so result is around 2 000 000 seconds here. I think it
is useless value...
Perhaps
priv->wdd.timeout = (hw_margin_max / 2) / 1000;
if (!priv->wdd.timeout)
priv->wdd.timeout = 1;
would be more appropriate.
I need to do some testing when I get the HW at my hands - please don't
apply this patch just yet. I will respin this after some testing - or
if other patches are applied then I will just send this one alone.
Sorry for the hassle...
--Matti
--
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND
~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
"non cogito me" dixit Rene Descarte, deinde evanescavit
(Thanks for the translation Simon)
