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Date: Wed, 16 Apr 2014 08:00:42 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Chanwoo Choi <cw00.choi@...sung.com>
CC: ch.naveen@...sung.com, kgene.kim@...sung.com, robh+dt@...nel.org,
pawel.moll@....com, mark.rutland@....com,
ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
rdunlap@...radead.org, t.figa@...sung.com,
linux-iio@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
devicetree@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCHv2 1/2] iio: adc: exynos_adc: Control special clock of ADC to support Exynos3250 ADC
On April 16, 2014 2:13:39 AM GMT+01:00, Chanwoo Choi <cw00.choi@...sung.com> wrote:
>Hi Jonathan,
>
>Any comment of this patchset?
>
>Best Regards,
>Chanwoo Choi
Hi Chanwoo
Not got to it yet I'm afraid. May be sometime next week before I do.
Jonathan
>
>On 04/14/2014 06:07 PM, Chanwoo Choi wrote:
>> This patch control special clock for ADC in Exynos series's FSYS
>block.
>> If special clock of ADC is registerd on clock list of common clk
>framework,
>> Exynos ADC drvier have to control this clock.
>>
>> Exynos3250/Exynos4/Exynos5 has 'adc' clock as following:
>> - 'adc' clock: bus clock for ADC
>>
>> Exynos3250 has additional 'sclk_tsadc' clock as following:
>> - 'sclk_tsadc' clock: special clock for ADC which provide clock to
>internal ADC
>>
>> Exynos 4210/4212/4412 and Exynos5250/5420 has not included
>'sclk_tsadc' clock
>> in FSYS_BLK. But, Exynos3250 based on Cortex-A7 has only included
>'sclk_tsadc'
>> clock in FSYS_BLK.
>>
>> Cc: Jonathan Cameron <jic23@...nel.org>
>> Cc: Kukjin Kim <kgene.kim@...sung.com>
>> Cc: Naveen Krishna Chatradhi
>> Cc: linux-iio@...r.kernel.org
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>> Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
>> ---
>> drivers/iio/adc/exynos_adc.c | 54
>+++++++++++++++++++++++++++++++++-----------
>> 1 file changed, 41 insertions(+), 13 deletions(-)
>>
>> diff --git a/drivers/iio/adc/exynos_adc.c
>b/drivers/iio/adc/exynos_adc.c
>> index d25b262..3c99243 100644
>> --- a/drivers/iio/adc/exynos_adc.c
>> +++ b/drivers/iio/adc/exynos_adc.c
>> @@ -40,8 +40,9 @@
>> #include <linux/iio/driver.h>
>>
>> enum adc_version {
>> - ADC_V1,
>> - ADC_V2
>> + ADC_V1 = 0x1,
>> + ADC_V2 = 0x2,
>> + ADC_V3 = (ADC_V1 | ADC_V2),
>> };
>>
>> /* EXYNOS4412/5250 ADC_V1 registers definitions */
>> @@ -88,6 +89,7 @@ struct exynos_adc {
>> void __iomem *regs;
>> void __iomem *enable_reg;
>> struct clk *clk;
>> + struct clk *sclk;
>> unsigned int irq;
>> struct regulator *vdd;
>>
>> @@ -100,6 +102,7 @@ struct exynos_adc {
>> static const struct of_device_id exynos_adc_match[] = {
>> { .compatible = "samsung,exynos-adc-v1", .data = (void *)ADC_V1 },
>> { .compatible = "samsung,exynos-adc-v2", .data = (void *)ADC_V2 },
>> + { .compatible = "samsung,exynos-adc-v3", .data = (void *)ADC_V3 },
>> {},
>> };
>> MODULE_DEVICE_TABLE(of, exynos_adc_match);
>> @@ -128,7 +131,7 @@ static int exynos_read_raw(struct iio_dev
>*indio_dev,
>> mutex_lock(&indio_dev->mlock);
>>
>> /* Select the channel to be used and Trigger conversion */
>> - if (info->version == ADC_V2) {
>> + if (info->version & ADC_V2) {
>> con2 = readl(ADC_V2_CON2(info->regs));
>> con2 &= ~ADC_V2_CON2_ACH_MASK;
>> con2 |= ADC_V2_CON2_ACH_SEL(chan->address);
>> @@ -165,7 +168,7 @@ static irqreturn_t exynos_adc_isr(int irq, void
>*dev_id)
>> info->value = readl(ADC_V1_DATX(info->regs)) &
>> ADC_DATX_MASK;
>> /* clear irq */
>> - if (info->version == ADC_V2)
>> + if (info->version & ADC_V2)
>> writel(1, ADC_V2_INT_ST(info->regs));
>> else
>> writel(1, ADC_V1_INTCLR(info->regs));
>> @@ -226,11 +229,25 @@ static int exynos_adc_remove_devices(struct
>device *dev, void *c)
>> return 0;
>> }
>>
>> +static void exynos_adc_enable_clock(struct exynos_adc *info, bool
>enable)
>> +{
>> + if (enable) {
>> + clk_prepare_enable(info->clk);
>> + if (info->version == ADC_V3)
>> + clk_prepare_enable(info->sclk);
>> +
>> + } else {
>> + if (info->version == ADC_V3)
>> + clk_disable_unprepare(info->sclk);
>> + clk_disable_unprepare(info->clk);
>> + }
>> +}
>> +
>> static void exynos_adc_hw_init(struct exynos_adc *info)
>> {
>> u32 con1, con2;
>>
>> - if (info->version == ADC_V2) {
>> + if (info->version & ADC_V2) {
>> con1 = ADC_V2_CON1_SOFT_RESET;
>> writel(con1, ADC_V2_CON1(info->regs));
>>
>> @@ -300,6 +317,8 @@ static int exynos_adc_probe(struct
>platform_device *pdev)
>>
>> writel(1, info->enable_reg);
>>
>> + info->version = exynos_adc_get_version(pdev);
>> +
>> info->clk = devm_clk_get(&pdev->dev, "adc");
>> if (IS_ERR(info->clk)) {
>> dev_err(&pdev->dev, "failed getting clock, err = %ld\n",
>> @@ -308,6 +327,17 @@ static int exynos_adc_probe(struct
>platform_device *pdev)
>> goto err_irq;
>> }
>>
>> + if (info->version == ADC_V3) {
>> + info->sclk = devm_clk_get(&pdev->dev, "sclk_tsadc");
>> + if (IS_ERR(info->sclk)) {
>> + dev_warn(&pdev->dev,
>> + "failed getting sclk clock, err = %ld\n",
>> + PTR_ERR(info->sclk));
>> + ret = PTR_ERR(info->sclk);
>> + goto err_irq;
>> + }
>> + }
>> +
>> info->vdd = devm_regulator_get(&pdev->dev, "vdd");
>> if (IS_ERR(info->vdd)) {
>> dev_err(&pdev->dev, "failed getting regulator, err = %ld\n",
>> @@ -316,8 +346,6 @@ static int exynos_adc_probe(struct
>platform_device *pdev)
>> goto err_irq;
>> }
>>
>> - info->version = exynos_adc_get_version(pdev);
>> -
>> platform_set_drvdata(pdev, indio_dev);
>>
>> indio_dev->name = dev_name(&pdev->dev);
>> @@ -340,7 +368,7 @@ static int exynos_adc_probe(struct
>platform_device *pdev)
>> if (ret)
>> goto err_iio_dev;
>>
>> - clk_prepare_enable(info->clk);
>> + exynos_adc_enable_clock(info, true);
>>
>> exynos_adc_hw_init(info);
>>
>> @@ -356,7 +384,7 @@ err_of_populate:
>> device_for_each_child(&pdev->dev, NULL,
>> exynos_adc_remove_devices);
>> regulator_disable(info->vdd);
>> - clk_disable_unprepare(info->clk);
>> + exynos_adc_enable_clock(info, false);
>> err_iio_dev:
>> iio_device_unregister(indio_dev);
>> err_irq:
>> @@ -372,7 +400,7 @@ static int exynos_adc_remove(struct
>platform_device *pdev)
>> device_for_each_child(&pdev->dev, NULL,
>> exynos_adc_remove_devices);
>> regulator_disable(info->vdd);
>> - clk_disable_unprepare(info->clk);
>> + exynos_adc_enable_clock(info, false);
>> writel(0, info->enable_reg);
>> iio_device_unregister(indio_dev);
>> free_irq(info->irq, info);
>> @@ -387,7 +415,7 @@ static int exynos_adc_suspend(struct device *dev)
>> struct exynos_adc *info = iio_priv(indio_dev);
>> u32 con;
>>
>> - if (info->version == ADC_V2) {
>> + if (info->version & ADC_V2) {
>> con = readl(ADC_V2_CON1(info->regs));
>> con &= ~ADC_CON_EN_START;
>> writel(con, ADC_V2_CON1(info->regs));
>> @@ -397,7 +425,7 @@ static int exynos_adc_suspend(struct device *dev)
>> writel(con, ADC_V1_CON(info->regs));
>> }
>>
>> - clk_disable_unprepare(info->clk);
>> + exynos_adc_enable_clock(info, false);
>> writel(0, info->enable_reg);
>> regulator_disable(info->vdd);
>>
>> @@ -415,7 +443,7 @@ static int exynos_adc_resume(struct device *dev)
>> return ret;
>>
>> writel(1, info->enable_reg);
>> - clk_prepare_enable(info->clk);
>> + exynos_adc_enable_clock(info, true);
>>
>> exynos_adc_hw_init(info);
>>
>>
--
Sent from my Android phone with K-9 Mail. Please excuse my brevity.
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