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watchdog: renesas_wdt: check rate also for upper limit

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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;
}