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>

diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
index f686378..05e9d95 100644 (file)
--- a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
+++ b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
@@ -15,7 +15,7 @@ Required properties:
                        Must be "samsung,exynos-adc-v2" for
                                future controllers.
 - reg:                 Contains ADC register address range (base address and
-                       length).
+                       length) and the address of the phy enable register.
 - interrupts:          Contains the interrupt information for the timer. The
                        format is being dependent on which interrupt controller
                        the Samsung device uses.
@@ -27,7 +27,7 @@ Example: adding device info in dtsi file
 
 adc: adc@12D10000 {
        compatible = "samsung,exynos-adc-v1";
-       reg = <0x12D10000 0x100>;
+       reg = <0x12D10000 0x100>, <0x10040718 0x4>;
        interrupts = <0 106 0>;
        #io-channel-cells = <1>;
        io-channel-ranges;

diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
index 6e968ae..4a8a9a3 100644 (file)
--- 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);