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Date: Fri, 15 Mar 2013 21:13:07 +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 15 March 2013 17:15, Naveen Krishna Ch <naveenkrishna.ch@...il.com> wrote:
> 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>
Tested-by: Naveen Krishna Chatradhi <ch.naveen@...sung.com>
I used this in mach file for testing. But this one worked aswell.
>
> 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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>
>
>
> --
> Shine bright,
> (: Nav :)
--
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