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gpio: aspeed: Don't attempt to debounce if disabled

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We warn the user at driver probe time that debouncing is disabled.
However, if they request debouncing later on we print a confusing error
message:

 gpio_aspeed 1e780000.gpio: Failed to convert 5000us to cycles at 0Hz: -524

Instead bail out when the clock is not present.

Fixes: 5ae4cb94b3 (gpio: aspeed: Add debounce support)
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Joel Stanley 2017-05-02 15:38:24 +09:30 committed by Linus Walleij
parent 08332893e3
commit df563c85de
1 changed files with 3 additions and 0 deletions
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3
drivers/gpio/gpio-aspeed.c
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@ -646,6 +646,9 @@ static int enable_debounce(struct gpio_chip *chip, unsigned int offset,
int rc;
int i;
if (!gpio->clk)
return -EINVAL;
rc = usecs_to_cycles(gpio, usecs, &requested_cycles);
if (rc < 0) {
dev_warn(chip->parent, "Failed to convert %luus to cycles at %luHz: %d\n",