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| author | Biju Das <biju.das.jz@bp.renesas.com> | 2022-02-25 17:53:20 +0000 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@linux-watchdog.org> | 2022-05-08 10:34:04 +0200 |
| commit | 4055ee81009e606e830af1acd9e2e35a36249713 (patch) | |
| tree | cf4034ff743d63c33e6a75a495e53c8d7faa586f /drivers/watchdog/rzg2l_wdt.c | |
| parent | f43e6ddbd7d7b63b9e71927a1f50860f8d55f9cc (diff) | |
| download | lwn-4055ee81009e606e830af1acd9e2e35a36249713.tar.gz lwn-4055ee81009e606e830af1acd9e2e35a36249713.zip | |
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 <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220225175320.11041-8-biju.das.jz@bp.renesas.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
Diffstat (limited to 'drivers/watchdog/rzg2l_wdt.c')
| -rw-r--r-- | drivers/watchdog/rzg2l_wdt.c | 20 |
1 files changed, 20 insertions, 0 deletions
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, }; |