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Date: Wed, 05 Nov 2014 15:25:43 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Vivek Gautam <gautam.vivek@...sung.com>, linux-iio@...r.kernel.org
CC: "linux-samsung-soc@...r.kernel.org"
<linux-samsung-soc@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
cw00.choi@...sung.com, Greg KH <gregkh@...uxfoundation.org>,
naveenkrishna.ch@...il.com, lars@...afoo.de,
CPGS <cpgs@...sung.com>, grundler@...omium.org
Subject: Re: [PATCH v2 1/3] iio: exyno-adc: use syscon for PMU register access
On 28/10/14 12:31, Vivek Gautam wrote:
> Hi all,
>
>
> CC'ing Naveen's gmail id, since the Samsung id is invalid now.
>
>
> On Tue, Sep 16, 2014 at 2:28 PM, Naveen Krishna Chatradhi
> <ch.naveen@...sung.com> wrote:
>> This patch updates the IIO based ADC driver to use syscon and regmap
>> APIs to access and use PMU registers instead of remapping the PMU
>> registers in the driver.
>>
>> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@...sung.com>
>> To: linux-iio@...r.kernel.org
>> ---
>> Changes since v1:
>> Rebased on top of togreg branch of IIO git
>
> If the changes look good, then first two patches of this series can be
> picked up ?
> The last dt patch then belongs to samsung tree.
Given the interlinked nature of the patches and Kukjin Kim's ack I'll
take the lot. Obviously if someone wants to pull the 3rd patch into
Samsung's tree as well, then git will deal with it just fine at merge
time!
Thanks,
Jonathan
>
>>
>> drivers/iio/adc/exynos_adc.c | 30 +++++++++++++++++++++---------
>> 1 file changed, 21 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
>> index 43620fd..fe03177 100644
>> --- a/drivers/iio/adc/exynos_adc.c
>> +++ b/drivers/iio/adc/exynos_adc.c
>> @@ -39,6 +39,8 @@
>> #include <linux/iio/iio.h>
>> #include <linux/iio/machine.h>
>> #include <linux/iio/driver.h>
>> +#include <linux/mfd/syscon.h>
>> +#include <linux/regmap.h>
>>
>> /* S3C/EXYNOS4412/5250 ADC_V1 registers definitions */
>> #define ADC_V1_CON(x) ((x) + 0x00)
>> @@ -90,11 +92,14 @@
>>
>> #define EXYNOS_ADC_TIMEOUT (msecs_to_jiffies(100))
>>
>> +#define EXYNOS_ADCV1_PHY_OFFSET 0x0718
>> +#define EXYNOS_ADCV2_PHY_OFFSET 0x0720
>> +
>> struct exynos_adc {
>> struct exynos_adc_data *data;
>> struct device *dev;
>> void __iomem *regs;
>> - void __iomem *enable_reg;
>> + struct regmap *pmu_map;
>> struct clk *clk;
>> struct clk *sclk;
>> unsigned int irq;
>> @@ -110,6 +115,7 @@ struct exynos_adc_data {
>> int num_channels;
>> bool needs_sclk;
>> bool needs_adc_phy;
>> + int phy_offset;
>> u32 mask;
>>
>> void (*init_hw)(struct exynos_adc *info);
>> @@ -183,7 +189,7 @@ static void exynos_adc_v1_init_hw(struct exynos_adc *info)
>> u32 con1;
>>
>> if (info->data->needs_adc_phy)
>> - writel(1, info->enable_reg);
>> + regmap_write(info->pmu_map, info->data->phy_offset, 1);
>>
>> /* set default prescaler values and Enable prescaler */
>> con1 = ADC_V1_CON_PRSCLV(49) | ADC_V1_CON_PRSCEN;
>> @@ -198,7 +204,7 @@ static void exynos_adc_v1_exit_hw(struct exynos_adc *info)
>> u32 con;
>>
>> if (info->data->needs_adc_phy)
>> - writel(0, info->enable_reg);
>> + regmap_write(info->pmu_map, info->data->phy_offset, 0);
>>
>> con = readl(ADC_V1_CON(info->regs));
>> con |= ADC_V1_CON_STANDBY;
>> @@ -225,6 +231,7 @@ static const struct exynos_adc_data exynos_adc_v1_data = {
>> .num_channels = MAX_ADC_V1_CHANNELS,
>> .mask = ADC_DATX_MASK, /* 12 bit ADC resolution */
>> .needs_adc_phy = true,
>> + .phy_offset = EXYNOS_ADCV1_PHY_OFFSET,
>>
>> .init_hw = exynos_adc_v1_init_hw,
>> .exit_hw = exynos_adc_v1_exit_hw,
>> @@ -314,7 +321,7 @@ static void exynos_adc_v2_init_hw(struct exynos_adc *info)
>> u32 con1, con2;
>>
>> if (info->data->needs_adc_phy)
>> - writel(1, info->enable_reg);
>> + regmap_write(info->pmu_map, info->data->phy_offset, 1);
>>
>> con1 = ADC_V2_CON1_SOFT_RESET;
>> writel(con1, ADC_V2_CON1(info->regs));
>> @@ -332,7 +339,7 @@ static void exynos_adc_v2_exit_hw(struct exynos_adc *info)
>> u32 con;
>>
>> if (info->data->needs_adc_phy)
>> - writel(0, info->enable_reg);
>> + regmap_write(info->pmu_map, info->data->phy_offset, 0);
>>
>> con = readl(ADC_V2_CON1(info->regs));
>> con &= ~ADC_CON_EN_START;
>> @@ -362,6 +369,7 @@ static const struct exynos_adc_data exynos_adc_v2_data = {
>> .num_channels = MAX_ADC_V2_CHANNELS,
>> .mask = ADC_DATX_MASK, /* 12 bit ADC resolution */
>> .needs_adc_phy = true,
>> + .phy_offset = EXYNOS_ADCV2_PHY_OFFSET,
>>
>> .init_hw = exynos_adc_v2_init_hw,
>> .exit_hw = exynos_adc_v2_exit_hw,
>> @@ -374,6 +382,7 @@ static const struct exynos_adc_data exynos3250_adc_data = {
>> .mask = ADC_DATX_MASK, /* 12 bit ADC resolution */
>> .needs_sclk = true,
>> .needs_adc_phy = true,
>> + .phy_offset = EXYNOS_ADCV1_PHY_OFFSET,
>>
>> .init_hw = exynos_adc_v2_init_hw,
>> .exit_hw = exynos_adc_v2_exit_hw,
>> @@ -558,10 +567,13 @@ static int exynos_adc_probe(struct platform_device *pdev)
>>
>>
>> if (info->data->needs_adc_phy) {
>> - mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
>> - info->enable_reg = devm_ioremap_resource(&pdev->dev, mem);
>> - if (IS_ERR(info->enable_reg))
>> - return PTR_ERR(info->enable_reg);
>> + info->pmu_map = syscon_regmap_lookup_by_phandle(
>> + pdev->dev.of_node,
>> + "samsung,syscon-phandle");
>> + if (IS_ERR(info->pmu_map)) {
>> + dev_err(&pdev->dev, "syscon regmap lookup failed.\n");
>> + return PTR_ERR(info->pmu_map);
>> + }
>> }
>>
>> irq = platform_get_irq(pdev, 0);
>> --
>> 1.7.9.5
>>
>> --
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>
>
>
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