iio: adc: exynos_adc: Control special clock for ADC

This patch control special clock for ADC in Exynos series's FSYS block.
If special clock of ADC is registerd on clock list of common clk framework,
Exynos ADC drvier have to control this clock.

- 'adc' clock: bus clock for ADC
- 'sclk_tsadc' clock: special clock for ADC which provide clock to internal ADC

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
index b3d03d3..60abe56 100644 (file)
--- a/drivers/iio/adc/exynos_adc.c
+++ b/drivers/iio/adc/exynos_adc.c
@@ -87,6 +87,7 @@ struct exynos_adc {
        void __iomem            *regs;
        void __iomem            *enable_reg;
        struct clk              *clk;
+       struct clk              *sclk;
        unsigned int            irq;
        struct regulator        *vdd;
 
@@ -99,6 +100,7 @@ struct exynos_adc {
 static const struct of_device_id exynos_adc_match[] = {
        { .compatible = "samsung,exynos-adc-v1", .data = (void *)ADC_V1 },
        { .compatible = "samsung,exynos-adc-v2", .data = (void *)ADC_V2 },
+       { .compatible = "samsung,exynos3250-adc-v2", .data = (void *)ADC_V2 },
        {},
 };
 MODULE_DEVICE_TABLE(of, exynos_adc_match);
@@ -312,6 +314,13 @@ static int exynos_adc_probe(struct platform_device *pdev)
                goto err_irq;
        }
 
+       info->sclk = devm_clk_get(&pdev->dev, "sclk_adc");
+       if (IS_ERR(info->sclk)) {
+               dev_warn(&pdev->dev, "failed getting sclk clock, err = %ld\n",
+                                                       PTR_ERR(info->sclk));
+               info->sclk = NULL;
+       }
+
        info->vdd = devm_regulator_get(&pdev->dev, "vdd");
        if (IS_ERR(info->vdd)) {
                dev_err(&pdev->dev, "failed getting regulator, err = %ld\n",
@@ -345,6 +354,7 @@ static int exynos_adc_probe(struct platform_device *pdev)
                goto err_iio_dev;
 
        clk_prepare_enable(info->clk);
+       clk_prepare_enable(info->sclk);
 
        exynos_adc_hw_init(info);
 
@@ -361,6 +371,7 @@ err_of_populate:
                                exynos_adc_remove_devices);
        regulator_disable(info->vdd);
        clk_disable_unprepare(info->clk);
+       clk_disable_unprepare(info->sclk);
 err_iio_dev:
        iio_device_unregister(indio_dev);
 err_irq:
@@ -379,6 +390,7 @@ static int exynos_adc_remove(struct platform_device *pdev)
                                exynos_adc_remove_devices);
        regulator_disable(info->vdd);
        clk_disable_unprepare(info->clk);
+       clk_disable_unprepare(info->sclk);
        writel(0, info->enable_reg);
        iio_device_unregister(indio_dev);
        free_irq(info->irq, info);
@@ -405,6 +417,7 @@ static int exynos_adc_suspend(struct device *dev)
        }
 
        clk_disable_unprepare(info->clk);
+       clk_disable_unprepare(info->sclk);
        writel(0, info->enable_reg);
        regulator_disable(info->vdd);
 
@@ -423,6 +436,7 @@ static int exynos_adc_resume(struct device *dev)
 
        writel(1, info->enable_reg);
        clk_prepare_enable(info->clk);
+       clk_prepare_enable(info->sclk);
 
        exynos_adc_hw_init(info);