From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752512AbdDHQhA (ORCPT ); Sat, 8 Apr 2017 12:37:00 -0400 Received: from saturn.retrosnub.co.uk ([178.18.118.26]:38196 "EHLO saturn.retrosnub.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751585AbdDHQg6 (ORCPT ); Sat, 8 Apr 2017 12:36:58 -0400 Subject: Re: [PATCH v4 4/8] iio: adc: sun4i-gpadc-iio: add support for A33 thermal sensor To: Quentin Schulz , dmitry.torokhov@gmail.com, robh+dt@kernel.org, mark.rutland@arm.com, maxime.ripard@free-electrons.com, wens@csie.org, lee.jones@linaro.org, linux@armlinux.org.uk, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net References: <20170405090634.4649-1-quentin.schulz@free-electrons.com> <20170405090634.4649-5-quentin.schulz@free-electrons.com> Cc: thomas.petazzoni@free-electrons.com, linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, linux-sunxi@googlegroups.com, icenowy@aosc.xyz From: Jonathan Cameron Message-ID: <6560f4ea-e8f6-e89f-a0b7-4cb044d15254@kernel.org> Date: Sat, 8 Apr 2017 17:36:52 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <20170405090634.4649-5-quentin.schulz@free-electrons.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/04/17 10:06, 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 > Acked-by: Lee Jones > Acked-by: Jonathan Cameron A small amount of fuzz turned up with a fix from Arnd for thermal dependencies. Applied to the togreg branch of iio.git and pushed out as testing for the autobuilders to play with it. Thanks, 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 d0af51d..d9b6101 100644 > --- a/drivers/iio/adc/Kconfig > +++ b/drivers/iio/adc/Kconfig > @@ -561,7 +561,7 @@ 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) >