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drivers/iio/adc/at91_adc.c: use clk_prepare_enable and clk_disable_unprepare

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Clk_prepare_enable and clk_disable_unprepare combine clk_prepare and
clk_enable, and clk_disable and clk_unprepare.  They make the code more
concise, and ensure that clk_unprepare is called when clk_enable fails.

A simplified version of the semantic patch that introduces calls to these
functions is as follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e;
@@

- clk_prepare(e);
- clk_enable(e);
+ clk_prepare_enable(e);

@@
expression e;
@@

- clk_disable(e);
- clk_unprepare(e);
+ clk_disable_unprepare(e);
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Julia Lawall 2012-08-26 17:00:00 +01:00 committed by Jonathan Cameron
parent f5ed9c35bd
commit 00062a9c2e
1 changed files with 9 additions and 24 deletions
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33
drivers/iio/adc/at91_adc.c
View File

@ -589,18 +589,13 @@ static int __devinit at91_adc_probe(struct platform_device *pdev)
goto error_free_irq;
}
ret = clk_prepare(st->clk);
ret = clk_prepare_enable(st->clk);
if (ret) {
dev_err(&pdev->dev, "Could not prepare the clock.\n");
dev_err(&pdev->dev,
"Could not prepare or enable the clock.\n");
goto error_free_irq;
}
ret = clk_enable(st->clk);
if (ret) {
dev_err(&pdev->dev, "Could not enable the clock.\n");
goto error_unprepare_clk;
}
st->adc_clk = devm_clk_get(&pdev->dev, "adc_op_clk");
if (IS_ERR(st->adc_clk)) {
dev_err(&pdev->dev, "Failed to get the ADC clock.\n");
@ -608,18 +603,13 @@ static int __devinit at91_adc_probe(struct platform_device *pdev)
goto error_disable_clk;
}
ret = clk_prepare(st->adc_clk);
ret = clk_prepare_enable(st->adc_clk);
if (ret) {
dev_err(&pdev->dev, "Could not prepare the ADC clock.\n");
dev_err(&pdev->dev,
"Could not prepare or enable the ADC clock.\n");
goto error_disable_clk;
}
ret = clk_enable(st->adc_clk);
if (ret) {
dev_err(&pdev->dev, "Could not enable the ADC clock.\n");
goto error_unprepare_adc_clk;
}
/*
* Prescaler rate computation using the formula from the Atmel's
* datasheet : ADC Clock = MCK / ((Prescaler + 1) * 2), ADC Clock being
@ -681,13 +671,9 @@ error_remove_triggers:
error_unregister_buffer:
at91_adc_buffer_remove(idev);
error_disable_adc_clk:
clk_disable(st->adc_clk);
error_unprepare_adc_clk:
clk_unprepare(st->adc_clk);
clk_disable_unprepare(st->adc_clk);
error_disable_clk:
clk_disable(st->clk);
error_unprepare_clk:
clk_unprepare(st->clk);
clk_disable_unprepare(st->clk);
error_free_irq:
free_irq(st->irq, idev);
error_free_device:
@ -705,8 +691,7 @@ static int __devexit at91_adc_remove(struct platform_device *pdev)
at91_adc_trigger_remove(idev);
at91_adc_buffer_remove(idev);
clk_disable_unprepare(st->adc_clk);
clk_disable(st->clk);
clk_unprepare(st->clk);
clk_disable_unprepare(st->clk);
free_irq(st->irq, idev);
iio_device_free(idev);