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Signed-off-by: Tomas Melin --- drivers/watchdog/cadence_wdt.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/watchdog/cadence_wdt.c b/drivers/watchdog/cadence_wdt.= c index ddbf602bdc40..a0d7666e7d20 100644 --- a/drivers/watchdog/cadence_wdt.c +++ b/drivers/watchdog/cadence_wdt.c @@ -18,9 +18,6 @@ #include =20 #define CDNS_WDT_DEFAULT_TIMEOUT 10 -/* Supports 1 - 516 sec */ -#define CDNS_WDT_MIN_TIMEOUT 1 -#define CDNS_WDT_MAX_TIMEOUT 516 =20 /* Restart key */ #define CDNS_WDT_RESTART_KEY 0x00001999 @@ -28,6 +25,10 @@ /* Counter register access key */ #define CDNS_WDT_REGISTER_ACCESS_KEY 0x00920000 =20 +/* Counter control register, counter restart values */ +#define CDNS_WDT_CCR_CRV_MIN 0xFFF +#define CDNS_WDT_CCR_CRV_MAX 0xFFFFFF + /* Counter value divisor */ #define CDNS_WDT_COUNTER_VALUE_DIVISOR 0x1000 =20 @@ -317,7 +318,10 @@ static int cdns_wdt_probe(struct platform_device *pdev= ) return ret; =20 clock_f =3D clk_get_rate(wdt->clk); - if (clock_f <=3D CDNS_WDT_CLK_75MHZ) { + if (clock_f =3D=3D 0) { + dev_err(dev, "invalid clock frequency, (f=3D%lu)\n", clock_f); + return -EINVAL; + } else if (clock_f <=3D CDNS_WDT_CLK_75MHZ) { wdt->prescaler =3D CDNS_WDT_PRESCALE_512; wdt->ctrl_clksel =3D CDNS_WDT_PRESCALE_SELECT_512; } else { @@ -329,8 +333,10 @@ static int cdns_wdt_probe(struct platform_device *pdev= ) cdns_wdt_device->info =3D &cdns_wdt_info; cdns_wdt_device->ops =3D &cdns_wdt_ops; cdns_wdt_device->timeout =3D CDNS_WDT_DEFAULT_TIMEOUT; - cdns_wdt_device->min_timeout =3D CDNS_WDT_MIN_TIMEOUT; - cdns_wdt_device->max_timeout =3D CDNS_WDT_MAX_TIMEOUT; + cdns_wdt_device->min_timeout =3D + CDNS_WDT_CCR_CRV_MIN * wdt->prescaler / clock_f; + cdns_wdt_device->max_timeout =3D + CDNS_WDT_CCR_CRV_MAX * wdt->prescaler / clock_f; =20 wdt->regs =3D devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(wdt->regs)) --=20 2.17.2