Commit 4055ee81 authored by Biju Das's avatar Biju Das Committed by Wim Van Sebroeck
Browse files

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: default avatarBiju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: default avatarGuenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220225175320.11041-8-biju.das.jz@bp.renesas.com


Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarWim Van Sebroeck <wim@linux-watchdog.org>
parent f43e6ddb

drivers/watchdog/rzg2l_wdt.c

+20 −0
Original line number Diff line number Diff line
@@ -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,

};