| Message ID | 20170321153611.16228-8-quentin.schulz@free-electrons.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 21/03/17 15:36, 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. > > Though the A33 does not have an internal ADC, it has a thermal sensor > which shares the same registers with GPADC of the already supported SoCs > and almost the same bits, for the same purpose (thermal sensor). > > The thermal sensor behaves exactly the same (except the presence of > interrupts or not) on the different SoCs. > > Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com> > Acked-by: Lee Jones <lee.jones@linaro.org> Acked-by: Jonathan Cameron <jic23@kernel.org> I'm assuming this is going through your tree Lee, let me know if you want to do it differently. Jonathan > --- > > v3: > - switched compatible from allwinner,sun8i-a33-gpadc-iio to > allwinner,sun8i-a33-ths to better reflect the datasheet's name, > - fixed the non-working if (!IS_ENABLED(THERMAL_OF)) by prefixing it with > CONFIG, > > 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 ++ > 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..74705aa 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-ths", > + .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(CONFIG_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) >
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..74705aa 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-ths", + .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(CONFIG_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)