[PATCH] gpio: aspeed: Don't attempt to debounce if disabled

From	Joel Stanley <joel@jms.id.au>
Newsgroups	linux.kernel
Subject	[PATCH] gpio: aspeed: Don't attempt to debounce if disabled
Date	2017-05-02 08:10 +0200
Message-ID	<tCzax-2zn-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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: 5ae4cb94b3133 (gpio: aspeed: Add debounce support)
Signed-off-by: Joel Stanley <joel@jms.id.au>
---
 drivers/gpio/gpio-aspeed.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpio/gpio-aspeed.c b/drivers/gpio/gpio-aspeed.c
index ccea609676ee..4ca436e66bdb 100644
--- a/drivers/gpio/gpio-aspeed.c
+++ b/drivers/gpio/gpio-aspeed.c
@@ -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",
-- 
2.11.0

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[PATCH] gpio: aspeed: Don't attempt to debounce if disabled Joel Stanley <joel@jms.id.au> - 2017-05-02 08:10 +0200
  Re: [PATCH] gpio: aspeed: Don't attempt to debounce if disabled Linus Walleij <linus.walleij@linaro.org> - 2017-05-11 13:40 +0200

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