iio: adc: Add dt support for turning on the phy in exynos-adc

Without this change the exynos adc controller needed to have its phy
enabled in some out-of-driver C code.  Add support for specifying the
phy enable register by listing it in the reg list.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Tested-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 13 insertions, 1 deletions

diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
index 6e968ae48c8a..4a8a9a34228f 100644
--- a/drivers/iio/adc/exynos_adc.c
+++ b/drivers/iio/adc/exynos_adc.c
@@ -85,6 +85,7 @@ enum adc_version {
 
 struct exynos_adc {
         void __iomem            *regs;
+        void __iomem            *enable_reg;
         struct clk              *clk;
         unsigned int            irq;
         struct regulator        *vdd;
@@ -269,13 +270,19 @@ static int exynos_adc_probe(struct platform_device *pdev)
         info = iio_priv(indio_dev);
 
         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-
         info->regs = devm_request_and_ioremap(&pdev->dev, mem);
         if (!info->regs) {
                 ret = -ENOMEM;
                 goto err_iio;
         }
 
+        mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+        info->enable_reg = devm_request_and_ioremap(&pdev->dev, mem);
+        if (!info->enable_reg) {
+                ret = -ENOMEM;
+                goto err_iio;
+        }
+
         irq = platform_get_irq(pdev, 0);
         if (irq < 0) {
                 dev_err(&pdev->dev, "no irq resource?\n");
@@ -295,6 +302,8 @@ static int exynos_adc_probe(struct platform_device *pdev)
                 goto err_iio;
         }
 
+        writel(1, info->enable_reg);
+
         info->clk = devm_clk_get(&pdev->dev, "adc");
         if (IS_ERR(info->clk)) {
                 dev_err(&pdev->dev, "failed getting clock, err = %ld\n",
@@ -370,6 +379,7 @@ static int exynos_adc_remove(struct platform_device *pdev)
                                 exynos_adc_remove_devices);
         regulator_disable(info->vdd);
         clk_disable_unprepare(info->clk);
+        writel(0, info->enable_reg);
         iio_device_unregister(indio_dev);
         free_irq(info->irq, info);
         iio_device_free(indio_dev);
@@ -395,6 +405,7 @@ static int exynos_adc_suspend(struct device *dev)
         }
 
         clk_disable_unprepare(info->clk);
+        writel(0, info->enable_reg);
         regulator_disable(info->vdd);
 
         return 0;
@@ -410,6 +421,7 @@ static int exynos_adc_resume(struct device *dev)
         if (ret)
                 return ret;
 
+        writel(1, info->enable_reg);
         clk_prepare_enable(info->clk);
 
         exynos_adc_hw_init(info);