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watchdog: renesas_wdt: check rate also for upper limit 

When checking the clock rate, ensure also that counting all 16 bits
takes at least one second to match the granularity of the framework.

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>
This commit is contained in:
Wolfram Sang 2017-07-19 10:27:52 +02:00 committed by Wim Van Sebroeck
parent f6159dd4b0
commit b51247c802
1 changed files with 2 additions and 2 deletions
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4
drivers/watchdog/renesas_wdt.c
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@ -134,14 +134,14 @@ static int rwdt_probe(struct platform_device *pdev)
for (i = ARRAY_SIZE(clk_divs) - 1; i >= 0; i--) {
clks_per_sec = DIV_ROUND_UP(rate, clk_divs[i]);
if (clks_per_sec) {
if (clks_per_sec && clks_per_sec < 65536) {
priv->clks_per_sec = clks_per_sec;
priv->cks = i;
break;
}
}
if (!clks_per_sec) {
if (i < 0) {
dev_err(&pdev->dev, "Can't find suitable clock divider\n");
return -ERANGE;
}