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Message-ID: <CAHfPSqCJVGsERi+jNTSYOJTCL0H-ytAcLTLb+7fQnFK1KGqkyg@mail.gmail.com>
Date: Fri, 15 Mar 2013 17:15:59 +0530
From: Naveen Krishna Ch <naveenkrishna.ch@...il.com>
To: Doug Anderson <dianders@...omium.org>
Cc: Jonathan Cameron <jic23@...nel.org>,
Kukjin Kim <kgene.kim@...sung.com>,
Lars-Peter Clausen <lars@...afoo.de>,
Naveen Krishna Chatradhi <ch.naveen@...sung.com>,
Olof Johansson <olof@...om.net>,
Guenter Roeck <linux@...ck-us.net>,
Grant Likely <grant.likely@...retlab.ca>,
Rob Herring <rob.herring@...xeda.com>,
Rob Landley <rob@...dley.net>,
Jonathan Cameron <jic23@....ac.uk>,
devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Subject: Re: [PATCH v2 2/4] iio: adc: Add dt support for turning on the phy in exynos-adc
On 14 March 2013 02:10, Doug Anderson <dianders@...omium.org> wrote:
> 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@...omium.org>
Worked for me, Its needed for Exynos5250 and future versions too.
Tested on SMDK5250.
> ---
> Changes in v2: None
>
> .../devicetree/bindings/arm/samsung/exynos-adc.txt | 4 ++--
> drivers/iio/adc/exynos_adc.c | 14 +++++++++++++-
> 2 files changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt b/Documentation/devicetree/bindings/arm/samsung/exynos-adc.txt
> index 96db940..05be151 100644
> --- 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.
> @@ -30,7 +30,7 @@ Example: adding device info in dtsi file
>
> adc: adc@...10000 {
> 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 ed6fdd7..5ab0dfd 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);
> --
> 1.8.1.3
>
> --
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--
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(: Nav :)
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