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i2c: uniphier: error out if clock rate is zero 

This input clock is used to generate the sampling clock for I2C bus.
If the clock rate is zero, there is something wrong with the clock
driver.  Bail out with the appropriate error message in such a case.
It would make it easier to find the root cause of failure.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Masahiro Yamada 2015-11-30 18:53:33 +09:00 committed by Wolfram Sang
parent ca68eade66
commit 1ff49b34bf
1 changed files with 5 additions and 1 deletions
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6
drivers/i2c/busses/i2c-uniphier.c
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@ -342,6 +342,10 @@ static int uniphier_i2c_clk_init(struct device *dev,
return ret;
clk_rate = clk_get_rate(priv->clk);
if (!clk_rate) {
dev_err(dev, "input clock rate should not be zero\n");
return -EINVAL;
}
uniphier_i2c_reset(priv, true);
@ -388,7 +392,7 @@ static int uniphier_i2c_probe(struct platform_device *pdev)
ret = uniphier_i2c_clk_init(dev, priv);
if (ret)
return ret;
goto err;
ret = devm_request_irq(dev, irq, uniphier_i2c_interrupt, 0, pdev->name,
priv);