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

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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>
This commit is contained in:
Doug Anderson 2013-03-13 20:40:00 +00:00 committed by Jonathan Cameron
parent f2f7a44970
commit bb916ebbea
2 changed files with 15 additions and 3 deletions
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4
Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
View file

@ -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;

14
drivers/iio/adc/exynos_adc.c
View file

@ -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);