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+rene...@sang-engineering.com>
---
drivers/watchdog/renesas_wdt.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/watchdog/renesas_wdt.c b/drivers/watchdog/renesas_wdt.c
index 599ba5aaa0536f..e3f204bb8802aa 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);
--
2.11.0
