From 4055ee81009e606e830af1acd9e2e35a36249713 Mon Sep 17 00:00:00 2001 From: Biju Das Date: Fri, 25 Feb 2022 17:53:20 +0000 Subject: watchdog: rzg2l_wdt: Add set_timeout callback This patch adds support for set_timeout callback. Once WDT is started, the WDT cycle setting register(WDTSET) can be updated only after issuing a module reset. Otherwise, it will ignore the writes and will hold the previous value. This patch updates the WDTSET register if it is active. Signed-off-by: Biju Das Reviewed-by: Geert Uytterhoeven Reviewed-by: Guenter Roeck Link: https://lore.kernel.org/r/20220225175320.11041-8-biju.das.jz@bp.renesas.com Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck --- drivers/watchdog/rzg2l_wdt.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'drivers/watchdog/rzg2l_wdt.c') diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c index 4e7107655cc2..6eea0ee4af49 100644 --- a/drivers/watchdog/rzg2l_wdt.c +++ b/drivers/watchdog/rzg2l_wdt.c @@ -115,6 +115,25 @@ static int rzg2l_wdt_stop(struct watchdog_device *wdev) return 0; } +static int rzg2l_wdt_set_timeout(struct watchdog_device *wdev, unsigned int timeout) +{ + struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev); + + wdev->timeout = timeout; + + /* + * If the watchdog is active, reset the module for updating the WDTSET + * register so that it is updated with new timeout values. + */ + if (watchdog_active(wdev)) { + pm_runtime_put(wdev->parent); + reset_control_reset(priv->rstc); + rzg2l_wdt_start(wdev); + } + + return 0; +} + static int rzg2l_wdt_restart(struct watchdog_device *wdev, unsigned long action, void *data) { @@ -151,6 +170,7 @@ static const struct watchdog_ops rzg2l_wdt_ops = { .start = rzg2l_wdt_start, .stop = rzg2l_wdt_stop, .ping = rzg2l_wdt_ping, + .set_timeout = rzg2l_wdt_set_timeout, .restart = rzg2l_wdt_restart, }; -- cgit v1.2.3