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iio: rockchip_adc: dynamically control clk

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黄涛
2014-10-28 15:00:57 +08:00
parent fd4605611e
commit d78fbdeefb
1 changed files with 18 additions and 6 deletions
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24
drivers/iio/adc/rockchip_adc.c
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@@ -120,6 +120,9 @@ static int rk_read_raw(struct iio_dev *indio_dev,
INIT_COMPLETION(info->completion);
clk_enable(info->clk);
clk_enable(info->pclk);
/* Select the channel to be used and Trigger conversion */
writel_relaxed(0x08, info->regs + ADC_DELAY_PU_SOC);
writel_relaxed(ADC_CTRL_POWER_UP|ADC_CTRL_CH(chan->channel)|ADC_CTRL_IRQ_ENABLE, info->regs + ADC_CTRL);
@@ -137,6 +140,9 @@ static int rk_read_raw(struct iio_dev *indio_dev,
ret = -ETIMEDOUT;
}
clk_disable(info->clk);
clk_disable(info->pclk);
mutex_unlock(&indio_dev->mlock);
return ret;
@@ -166,8 +172,14 @@ static int rk_adc_reg_access(struct iio_dev *indio_dev,
if (readval == NULL)
return -EINVAL;
clk_enable(info->clk);
clk_enable(info->pclk);
*readval = readl_relaxed(info->regs + reg);
clk_disable(info->clk);
clk_disable(info->pclk);
return 0;
}
@@ -255,7 +267,7 @@ static int rk_adc_probe(struct platform_device *pdev)
ret = PTR_ERR(info->pclk);
goto err_iio;
}
clk_prepare_enable(info->pclk);
clk_prepare(info->pclk);
info->clk = devm_clk_get(&pdev->dev, "saradc");
if (IS_ERR(info->clk)) {
@@ -274,7 +286,7 @@ static int rk_adc_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "failed to set adc clk\n");
goto err_pclk;
}
clk_prepare_enable(info->clk);
clk_prepare(info->clk);
//device register
indio_dev->name = dev_name(&pdev->dev);
@@ -310,10 +322,10 @@ err_iio_dev:
iio_device_unregister(indio_dev);
err_clk:
clk_disable_unprepare(info->clk);
clk_unprepare(info->clk);
err_pclk:
clk_disable_unprepare(info->pclk);
clk_unprepare(info->pclk);
err_iio:
iio_device_free(indio_dev);
@@ -327,8 +339,8 @@ static int rk_adc_remove(struct platform_device *pdev)
device_for_each_child(&pdev->dev, NULL,
rk_adc_remove_devices);
clk_disable_unprepare(info->clk);
clk_disable_unprepare(info->pclk);
clk_unprepare(info->clk);
clk_unprepare(info->pclk);
iio_device_unregister(indio_dev);
free_irq(info->irq, info);
iio_device_free(indio_dev);