diff options
| author |   Wolfram Sang <wsa+renesas@sang-engineering.com> | 2017-07-19 10:27:55 +0200 |
|---|---|---|
| committer |   Wim Van Sebroeck <wim@iguana.be> | 2017-09-09 20:23:24 +0200 |
| commit | 03a196f25f5652a3deffc1b8eade8a3c1c39282c (patch) | |
| tree | daef7ae9ab99d622a09ad0747a08cbcd31a45438 /drivers/watchdog | |
| parent | watchdog: renesas_wdt: apply better precision (diff) | |
| download | linux-dev-03a196f25f5652a3deffc1b8eade8a3c1c39282c.tar.xz linux-dev-03a196f25f5652a3deffc1b8eade8a3c1c39282c.zip | |
watchdog: renesas_wdt: add another divider option
If we set RWTCSRB to 0, we can gain 4096 as another divider value. This
is supported by all R-Car Gen2 and Gen3 devices which we aim to support.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Diffstat (limited to 'drivers/watchdog')
| -rw-r--r-- | drivers/watchdog/renesas_wdt.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c index 599ba5aaa053..e3f204bb8802 100644 --- a/drivers/watchdog/renesas_wdt.c +++ b/drivers/watchdog/renesas_wdt.c @@ -23,21 +23,22 @@ #define RWTCSRA_WOVF BIT(4) #define RWTCSRA_WRFLG BIT(5) #define RWTCSRA_TME BIT(7) +#define RWTCSRB 8 #define RWDT_DEFAULT_TIMEOUT 60U /* * In probe, clk_rate is checked to be not more than 16 bit * biggest clock - * divider (10 bits). d is only a factor to fully utilize the WDT counter and + * divider (12 bits). d is only a factor to fully utilize the WDT counter and * will not exceed its 16 bits. Thus, no overflow, we stay below 32 bits. */ #define MUL_BY_CLKS_PER_SEC(p, d) \ DIV_ROUND_UP((d) * (p)->clk_rate, clk_divs[(p)->cks]) -/* d is 16 bit, clk_divs 10 bit -> no 32 bit overflow */ +/* d is 16 bit, clk_divs 12 bit -> no 32 bit overflow */ #define DIV_BY_CLKS_PER_SEC(p, d) ((d) * clk_divs[(p)->cks] / (p)->clk_rate) -static const unsigned int clk_divs[] = { 1, 4, 16, 32, 64, 128, 1024 }; +static const unsigned int clk_divs[] = { 1, 4, 16, 32, 64, 128, 1024, 4096 }; static bool nowayout = WATCHDOG_NOWAYOUT; module_param(nowayout, bool, 0); @@ -77,6 +78,7 @@ static int rwdt_start(struct watchdog_device *wdev) clk_prepare_enable(priv->clk); + rwdt_write(priv, 0, RWTCSRB); rwdt_write(priv, priv->cks, RWTCSRA); rwdt_init_timeout(wdev); |