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Date: Wed, 05 Nov 2014 15:29:03 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Naveen Krishna Chatradhi <ch.naveen@...sung.com>,
linux-iio@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
devicetree@...r.kernel.org
CC: linux-kernel@...r.kernel.org, cw00.choi@...sung.com,
gregkh@...uxfoundation.org, naveenkrishna.ch@...il.com,
lars@...afoo.de, cpgs@...sung.com, grundler@...omium.org
Subject: Re: [PATCH v2 1/3] iio: exyno-adc: use syscon for PMU register access
On 16/09/14 09:58, Naveen Krishna Chatradhi 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
Applied to the togreg branch of iio.git - initially pushed out as testing
for the autobuilders to play.
> ---
> Changes since v1:
> Rebased on top of togreg branch of IIO git
>
> 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);
>
--
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