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can: mcp251x: Use devm_clk_get_optional() to get the input clock

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Simplify the code which fetches the input clock by using
devm_clk_get_optional(). This comes with a small functional change: previously
all errors were ignored when platform data is present. Now all errors are
treated as errors. If no input clock is present devm_clk_get_optional() will
return NULL instead of an error which matches the behavior of the old code.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Andy Shevchenko
2019-08-26 20:26:21 +03:00
committed by Marc Kleine-Budde
parent f6cae800bf
commit b4cb76961c
1 changed files with 12 additions and 18 deletions
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30
drivers/net/can/spi/mcp251x.c
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@@ -994,15 +994,13 @@ static int mcp251x_can_probe(struct spi_device *spi)
struct clk *clk;
int freq, ret;
clk = devm_clk_get(&spi->dev, NULL);
if (IS_ERR(clk)) {
if (pdata)
freq = pdata->oscillator_frequency;
else
return PTR_ERR(clk);
} else {
freq = clk_get_rate(clk);
}
clk = devm_clk_get_optional(&spi->dev, NULL);
if (IS_ERR(clk))
return PTR_ERR(clk);
freq = clk_get_rate(clk);
if (freq == 0 && pdata)
freq = pdata->oscillator_frequency;
/* Sanity check */
if (freq < 1000000 || freq > 25000000)
@@ -1013,11 +1011,9 @@ static int mcp251x_can_probe(struct spi_device *spi)
if (!net)
return -ENOMEM;
if (!IS_ERR(clk)) {
ret = clk_prepare_enable(clk);
if (ret)
goto out_free;
}
ret = clk_prepare_enable(clk);
if (ret)
goto out_free;
net->netdev_ops = &mcp251x_netdev_ops;
net->flags |= IFF_ECHO;
@@ -1102,8 +1098,7 @@ error_probe:
mcp251x_power_enable(priv->power, 0);
out_clk:
if (!IS_ERR(clk))
clk_disable_unprepare(clk);
clk_disable_unprepare(clk);
out_free:
free_candev(net);
@@ -1121,8 +1116,7 @@ static int mcp251x_can_remove(struct spi_device *spi)
mcp251x_power_enable(priv->power, 0);
if (!IS_ERR(priv->clk))
clk_disable_unprepare(priv->clk);
clk_disable_unprepare(priv->clk);
free_candev(net);