linux-kernel - Re: [PATCH v2 2/7] clocksource: Add Tegra186 timers support

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Date:   Fri, 3 Apr 2020 19:24:55 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Jon Hunter <jonathanh@...dia.com>, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/7] clocksource: Add Tegra186 timers support

01.04.2020 01:19, Thierry Reding пишет:
...
> +static int tegra186_wdt_set_timeout(struct watchdog_device *wdd,
> +				    unsigned int timeout)
> +{
> +	struct tegra186_wdt *wdt = to_tegra186_wdt(wdd);
> +
> +	tegra186_wdt_disable(wdt);
> +	wdt->base.timeout = timeout;
> +	tegra186_wdt_enable(wdt);

Why changing timeout enables the watchdog?

> +	return 0;
> +}
> +
> +static const struct watchdog_ops tegra186_wdt_ops = {
> +	.owner = THIS_MODULE,
> +	.start = tegra186_wdt_start,
> +	.stop = tegra186_wdt_stop,
> +	.ping = tegra186_wdt_ping,
> +	.set_timeout = tegra186_wdt_set_timeout,
> +};

...
> +static int __maybe_unused tegra186_timer_suspend(struct device *dev)
> +{
> +	struct tegra186_timer *tegra = dev_get_drvdata(dev);
> +
> +	if (tegra->wdt)
> +		tegra186_wdt_disable(tegra->wdt);
> +
> +	return 0;
> +}
> +
> +static int __maybe_unused tegra186_timer_resume(struct device *dev)
> +{
> +	struct tegra186_timer *tegra = dev_get_drvdata(dev);
> +
> +	if (tegra->wdt)
> +		tegra186_wdt_enable(tegra->wdt);

What if watchdog is in a stopped state? Why it's enabled unconditionally?

> +	return 0;
> +}