[PATCH v2 08/11] iio: adc: sun4i-gpadc-iio: add support for A33 thermal sensor
Lee Jones
lee.jones at linaro.org
Wed Mar 15 03:38:06 PDT 2017
On Fri, 10 Mar 2017, Quentin Schulz wrote:
> This adds support for the Allwinner A33 thermal sensor.
>
> Unlike the A10, A13 and A31, the Allwinner A33 only has one channel
> which is dedicated to the thermal sensor. Moreover, its thermal sensor
> does not generate interruptions, thus we only need to directly read the
> register storing the temperature value.
>
> The MFD used by the A10, A13 and A31, was created to avoid breaking the
> DT binding, but since the nodes for the ADC weren't there for the A33,
> it is not needed.
>
> Signed-off-by: Quentin Schulz <quentin.schulz at free-electrons.com>
> ---
>
> v2:
> - removed added comments in Kconfig,
> - simplified Kconfig depends on condition,
> - removed THERMAL_OF requirement for sun8i,
> - renamed sun8i_gpadc_channels to sun8i_a33_gpadc_channels,
> - renamed use_dt boolean in no_irq as it reflects better why we need it,
> - removed spurious/unneeded modifications done in v1,
>
> drivers/iio/adc/Kconfig | 2 +-
> drivers/iio/adc/sun4i-gpadc-iio.c | 100 ++++++++++++++++++++++++++++++++++++--
> include/linux/mfd/sun4i-gpadc.h | 4 ++
For the MFD parts only:
Acked-by: Lee Jones <lee.jones at linaro.org>
> 3 files changed, 102 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 9f8b4b1..8c8ead6 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -562,7 +562,7 @@ config STX104
> config SUN4I_GPADC
> tristate "Support for the Allwinner SoCs GPADC"
> depends on IIO
> - depends on MFD_SUN4I_GPADC
> + depends on MFD_SUN4I_GPADC || MACH_SUN8I
> help
> Say yes here to build support for Allwinner (A10, A13 and A31) SoCs
> GPADC. This ADC provides 4 channels which can be used as an ADC or as
> diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c
> index 7cb997a..70684cd 100644
> --- a/drivers/iio/adc/sun4i-gpadc-iio.c
> +++ b/drivers/iio/adc/sun4i-gpadc-iio.c
> @@ -85,6 +85,12 @@ static const struct gpadc_data sun6i_gpadc_data = {
> .adc_chan_mask = SUN6I_GPADC_CTRL1_ADC_CHAN_MASK,
> };
>
> +static const struct gpadc_data sun8i_a33_gpadc_data = {
> + .temp_offset = -1662,
> + .temp_scale = 162,
> + .tp_mode_en = SUN8I_GPADC_CTRL1_CHOP_TEMP_EN,
> +};
> +
> struct sun4i_gpadc_iio {
> struct iio_dev *indio_dev;
> struct completion completion;
> @@ -96,6 +102,7 @@ struct sun4i_gpadc_iio {
> unsigned int temp_data_irq;
> atomic_t ignore_temp_data_irq;
> const struct gpadc_data *data;
> + bool no_irq;
> /* prevents concurrent reads of temperature and ADC */
> struct mutex mutex;
> };
> @@ -138,6 +145,23 @@ static const struct iio_chan_spec sun4i_gpadc_channels_no_temp[] = {
> SUN4I_GPADC_ADC_CHANNEL(3, "adc_chan3"),
> };
>
> +static const struct iio_chan_spec sun8i_a33_gpadc_channels[] = {
> + {
> + .type = IIO_TEMP,
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> + BIT(IIO_CHAN_INFO_SCALE) |
> + BIT(IIO_CHAN_INFO_OFFSET),
> + .datasheet_name = "temp_adc",
> + },
> +};
> +
> +static const struct regmap_config sun4i_gpadc_regmap_config = {
> + .reg_bits = 32,
> + .val_bits = 32,
> + .reg_stride = 4,
> + .fast_io = true,
> +};
> +
> static int sun4i_prepare_for_irq(struct iio_dev *indio_dev, int channel,
> unsigned int irq)
> {
> @@ -247,6 +271,17 @@ static int sun4i_gpadc_temp_read(struct iio_dev *indio_dev, int *val)
> {
> struct sun4i_gpadc_iio *info = iio_priv(indio_dev);
>
> + if (info->no_irq) {
> + pm_runtime_get_sync(indio_dev->dev.parent);
> +
> + regmap_read(info->regmap, SUN4I_GPADC_TEMP_DATA, val);
> +
> + pm_runtime_mark_last_busy(indio_dev->dev.parent);
> + pm_runtime_put_autosuspend(indio_dev->dev.parent);
> +
> + return 0;
> + }
> +
> return sun4i_gpadc_read(indio_dev, 0, val, info->temp_data_irq);
> }
>
> @@ -454,6 +489,58 @@ static int sun4i_irq_init(struct platform_device *pdev, const char *name,
> return 0;
> }
>
> +static const struct of_device_id sun4i_gpadc_of_id[] = {
> + {
> + .compatible = "allwinner,sun8i-a33-gpadc-iio",
> + .data = &sun8i_a33_gpadc_data,
> + },
> + { /* sentinel */ }
> +};
> +
> +static int sun4i_gpadc_probe_dt(struct platform_device *pdev,
> + struct iio_dev *indio_dev)
> +{
> + struct sun4i_gpadc_iio *info = iio_priv(indio_dev);
> + const struct of_device_id *of_dev;
> + struct thermal_zone_device *tzd;
> + struct resource *mem;
> + void __iomem *base;
> + int ret;
> +
> + of_dev = of_match_device(sun4i_gpadc_of_id, &pdev->dev);
> + if (!of_dev)
> + return -ENODEV;
> +
> + info->no_irq = true;
> + info->data = (struct gpadc_data *)of_dev->data;
> + indio_dev->num_channels = ARRAY_SIZE(sun8i_a33_gpadc_channels);
> + indio_dev->channels = sun8i_a33_gpadc_channels;
> +
> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + base = devm_ioremap_resource(&pdev->dev, mem);
> + if (IS_ERR(base))
> + return PTR_ERR(base);
> +
> + info->regmap = devm_regmap_init_mmio(&pdev->dev, base,
> + &sun4i_gpadc_regmap_config);
> + if (IS_ERR(info->regmap)) {
> + ret = PTR_ERR(info->regmap);
> + dev_err(&pdev->dev, "failed to init regmap: %d\n", ret);
> + return ret;
> + }
> +
> + if (!IS_ENABLED(THERMAL_OF))
> + return 0;
> +
> + tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, 0, info,
> + &sun4i_ts_tz_ops);
> + if (IS_ERR(tzd))
> + dev_err(&pdev->dev, "could not register thermal sensor: %ld\n",
> + PTR_ERR(tzd));
> +
> + return PTR_ERR_OR_ZERO(tzd);
> +}
> +
> static int sun4i_gpadc_probe_mfd(struct platform_device *pdev,
> struct iio_dev *indio_dev)
> {
> @@ -462,6 +549,7 @@ static int sun4i_gpadc_probe_mfd(struct platform_device *pdev,
> dev_get_drvdata(pdev->dev.parent);
> int ret;
>
> + info->no_irq = false;
> info->regmap = sun4i_gpadc_dev->regmap;
>
> indio_dev->num_channels = ARRAY_SIZE(sun4i_gpadc_channels);
> @@ -561,7 +649,11 @@ static int sun4i_gpadc_probe(struct platform_device *pdev)
> indio_dev->info = &sun4i_gpadc_iio_info;
> indio_dev->modes = INDIO_DIRECT_MODE;
>
> - ret = sun4i_gpadc_probe_mfd(pdev, indio_dev);
> + if (pdev->dev.of_node)
> + ret = sun4i_gpadc_probe_dt(pdev, indio_dev);
> + else
> + ret = sun4i_gpadc_probe_mfd(pdev, indio_dev);
> +
> if (ret)
> return ret;
>
> @@ -580,7 +672,7 @@ static int sun4i_gpadc_probe(struct platform_device *pdev)
> return 0;
>
> err_map:
> - if (IS_ENABLED(CONFIG_THERMAL_OF))
> + if (!info->no_irq && IS_ENABLED(CONFIG_THERMAL_OF))
> iio_map_array_unregister(indio_dev);
>
> pm_runtime_put(&pdev->dev);
> @@ -592,10 +684,11 @@ static int sun4i_gpadc_probe(struct platform_device *pdev)
> static int sun4i_gpadc_remove(struct platform_device *pdev)
> {
> struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> + struct sun4i_gpadc_iio *info = iio_priv(indio_dev);
>
> pm_runtime_put(&pdev->dev);
> pm_runtime_disable(&pdev->dev);
> - if (IS_ENABLED(CONFIG_THERMAL_OF))
> + if (!info->no_irq && IS_ENABLED(CONFIG_THERMAL_OF))
> iio_map_array_unregister(indio_dev);
>
> return 0;
> @@ -611,6 +704,7 @@ static const struct platform_device_id sun4i_gpadc_id[] = {
> static struct platform_driver sun4i_gpadc_driver = {
> .driver = {
> .name = "sun4i-gpadc-iio",
> + .of_match_table = sun4i_gpadc_of_id,
> .pm = &sun4i_gpadc_pm_ops,
> },
> .id_table = sun4i_gpadc_id,
> diff --git a/include/linux/mfd/sun4i-gpadc.h b/include/linux/mfd/sun4i-gpadc.h
> index 509e736..139872c 100644
> --- a/include/linux/mfd/sun4i-gpadc.h
> +++ b/include/linux/mfd/sun4i-gpadc.h
> @@ -38,6 +38,10 @@
> #define SUN6I_GPADC_CTRL1_ADC_CHAN_SELECT(x) (GENMASK(3, 0) & BIT(x))
> #define SUN6I_GPADC_CTRL1_ADC_CHAN_MASK GENMASK(3, 0)
>
> +/* TP_CTRL1 bits for sun8i SoCs */
> +#define SUN8I_GPADC_CTRL1_CHOP_TEMP_EN BIT(8)
> +#define SUN8I_GPADC_CTRL1_GPADC_CALI_EN BIT(7)
> +
> #define SUN4I_GPADC_CTRL2 0x08
>
> #define SUN4I_GPADC_CTRL2_TP_SENSITIVE_ADJUST(x) ((GENMASK(3, 0) & (x)) << 28)
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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