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Message-ID: <CAEExFWt_c0gdwudf62JhT1et6SPXUEwE67KTdjtmk7fnSAcEiQ@mail.gmail.com>
Date: Fri, 29 Nov 2019 19:46:58 +0800
From: Frank Lee <tiny.windzz@...il.com>
To: Frank Lee <tiny.windzz@...il.com>,
Vasily Khoruzhick <anarsoul@...il.com>,
Zhang Rui <rui.zhang@...el.com>,
Eduardo Valentin <edubezval@...il.com>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Amit Kucheria <amit.kucheria@...durent.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Maxime Ripard <mripard@...nel.org>,
Chen-Yu Tsai <wens@...e.org>,
Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Linux PM <linux-pm@...r.kernel.org>,
devicetree <devicetree@...r.kernel.org>,
Linux ARM <linux-arm-kernel@...ts.infradead.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 1/7] thermal: sun8i: add thermal driver for H6/H5/H3/A64/A83T/R40
On Fri, Nov 29, 2019 at 1:06 AM Ondřej Jirman <megous@...ous.com> wrote:
>
> On Fri, Nov 29, 2019 at 12:43:02AM +0800, Frank Lee wrote:
> > HI,
> >
> > I took a closer look at it, and I had some questions about these places.
> >
> > On Wed, Nov 27, 2019 at 1:30 PM Vasily Khoruzhick <anarsoul@...il.com> wrote:
> > >
> > > From: Yangtao Li <tiny.windzz@...il.com>
> > >
> > > This patch adds the support for allwinner thermal sensor, within
> > > allwinner SoC. It will register sensors for thermal framework
> > > and use device tree to bind cooling device.
> > >
> > > Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> > > Signed-off-by: Ondrej Jirman <megous@...ous.com>
> > > Signed-off-by: Vasily Khoruzhick <anarsoul@...il.com>
> > > ---
> > > MAINTAINERS | 7 +
> > > drivers/thermal/Kconfig | 14 +
> > > drivers/thermal/Makefile | 1 +
> > > drivers/thermal/sun8i_thermal.c | 643 ++++++++++++++++++++++++++++++++
> > > 4 files changed, 665 insertions(+)
> > > create mode 100644 drivers/thermal/sun8i_thermal.c
> > >
> > > diff --git a/MAINTAINERS b/MAINTAINERS
> > > index 66cc549ac327..da34f3f2e80b 100644
> > > --- a/MAINTAINERS
> > > +++ b/MAINTAINERS
> > > @@ -688,6 +688,13 @@ L: linux-crypto@...r.kernel.org
> > > S: Maintained
> > > F: drivers/crypto/allwinner/
> > >
> > > +ALLWINNER THERMAL DRIVER
> > > +M: Yangtao Li <tiny.windzz@...il.com>
> > > +L: linux-pm@...r.kernel.org
> > > +S: Maintained
> > > +F: Documentation/devicetree/bindings/thermal/allwinner,sun8i-a83t-ths.yaml
> > > +F: drivers/thermal/sun8i_thermal.c
> > > +
> > > ALLWINNER VPU DRIVER
> > > M: Maxime Ripard <mripard@...nel.org>
> > > M: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> > > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> > > index 001a21abcc28..0b0422e89adb 100644
> > > --- a/drivers/thermal/Kconfig
> > > +++ b/drivers/thermal/Kconfig
> > > @@ -262,6 +262,20 @@ config SPEAR_THERMAL
> > > Enable this to plug the SPEAr thermal sensor driver into the Linux
> > > thermal framework.
> > >
> > > +config SUN8I_THERMAL
> > > + tristate "Allwinner sun8i thermal driver"
> > > + depends on ARCH_SUNXI || COMPILE_TEST
> > > + depends on HAS_IOMEM
> > > + depends on NVMEM
> > > + depends on OF
> > > + depends on RESET_CONTROLLER
> > > + help
> > > + Support for the sun8i thermal sensor driver into the Linux thermal
> > > + framework.
> > > +
> > > + To compile this driver as a module, choose M here: the
> > > + module will be called sun8i-thermal.
> > > +
> > > config ROCKCHIP_THERMAL
> > > tristate "Rockchip thermal driver"
> > > depends on ARCH_ROCKCHIP || COMPILE_TEST
> > > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> > > index 74a37c7f847a..fa6f8b206281 100644
> > > --- a/drivers/thermal/Makefile
> > > +++ b/drivers/thermal/Makefile
> > > @@ -31,6 +31,7 @@ thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o
> > > obj-y += broadcom/
> > > obj-$(CONFIG_THERMAL_MMIO) += thermal_mmio.o
> > > obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o
> > > +obj-$(CONFIG_SUN8I_THERMAL) += sun8i_thermal.o
> > > obj-$(CONFIG_ROCKCHIP_THERMAL) += rockchip_thermal.o
> > > obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o
> > > obj-$(CONFIG_RCAR_GEN3_THERMAL) += rcar_gen3_thermal.o
> > > diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c
> > > new file mode 100644
> > > index 000000000000..e86b64f51196
> > > --- /dev/null
> > > +++ b/drivers/thermal/sun8i_thermal.c
> > > @@ -0,0 +1,643 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * Thermal sensor driver for Allwinner SOC
> > > + * Copyright (C) 2019 Yangtao Li
> > > + *
> > > + * Based on the work of Icenowy Zheng <icenowy@...c.io>
> > > + * Based on the work of Ondrej Jirman <megous@...ous.com>
> > > + * Based on the work of Josef Gajdusek <atx@....name>
> > > + */
> > > +
> > > +#include <linux/clk.h>
> > > +#include <linux/device.h>
> > > +#include <linux/interrupt.h>
> > > +#include <linux/module.h>
> > > +#include <linux/nvmem-consumer.h>
> > > +#include <linux/of_device.h>
> > > +#include <linux/platform_device.h>
> > > +#include <linux/regmap.h>
> > > +#include <linux/reset.h>
> > > +#include <linux/slab.h>
> > > +#include <linux/thermal.h>
> > > +
> > > +#define MAX_SENSOR_NUM 4
> > > +
> > > +#define FT_TEMP_MASK GENMASK(11, 0)
> > > +#define TEMP_CALIB_MASK GENMASK(11, 0)
> > > +#define CALIBRATE_DEFAULT 0x800
> > > +
> > > +#define SUN8I_THS_CTRL0 0x00
> > > +#define SUN8I_THS_CTRL2 0x40
> > > +#define SUN8I_THS_IC 0x44
> > > +#define SUN8I_THS_IS 0x48
> > > +#define SUN8I_THS_MFC 0x70
> > > +#define SUN8I_THS_TEMP_CALIB 0x74
> > > +#define SUN8I_THS_TEMP_DATA 0x80
> > > +
> > > +#define SUN50I_THS_CTRL0 0x00
> > > +#define SUN50I_H6_THS_ENABLE 0x04
> > > +#define SUN50I_H6_THS_PC 0x08
> > > +#define SUN50I_H6_THS_DIC 0x10
> > > +#define SUN50I_H6_THS_DIS 0x20
> > > +#define SUN50I_H6_THS_MFC 0x30
> > > +#define SUN50I_H6_THS_TEMP_CALIB 0xa0
> > > +#define SUN50I_H6_THS_TEMP_DATA 0xc0
> > > +
> > > +#define SUN8I_THS_CTRL0_T_ACQ0(x) (GENMASK(15, 0) & (x))
> > > +#define SUN8I_THS_CTRL2_T_ACQ1(x) ((GENMASK(15, 0) & (x)) << 16)
> > > +#define SUN8I_THS_DATA_IRQ_STS(x) BIT(x + 8)
> > > +
> > > +#define SUN50I_THS_CTRL0_T_ACQ(x) ((GENMASK(15, 0) & (x)) << 16)
> > > +#define SUN50I_THS_FILTER_EN BIT(2)
> > > +#define SUN50I_THS_FILTER_TYPE(x) (GENMASK(1, 0) & (x))
> > > +#define SUN50I_H6_THS_PC_TEMP_PERIOD(x) ((GENMASK(19, 0) & (x)) << 12)
> > > +#define SUN50I_H6_THS_DATA_IRQ_STS(x) BIT(x)
> > > +
> > > +/* millidegree celsius */
> > > +#define THS_EFUSE_CP_FT_MASK 0x3000
> > > +#define THS_EFUSE_CP_FT_BIT 12
> > > +#define THS_CALIBRATION_IN_FT 1
> > > +
> > > +struct ths_device;
> > > +
> > > +struct tsensor {
> > > + struct ths_device *tmdev;
> > > + struct thermal_zone_device *tzd;
> > > + int id;
> > > +};
> > > +
> > > +struct ths_thermal_chip {
> > > + bool has_mod_clk;
> > > + bool has_bus_clk_reset;
> > > + int sensor_num;
> > > + int offset;
> > > + int scale;
> > > + int ft_deviation;
> > > + int temp_data_base;
> > > + int (*calibrate)(struct ths_device *tmdev,
> > > + u16 *caldata, int callen);
> > > + int (*init)(struct ths_device *tmdev);
> > > + int (*irq_ack)(struct ths_device *tmdev);
> > > + int (*calc_temp)(struct ths_device *tmdev,
> > > + int id, int reg);
> > > +};
> > > +
> > > +struct ths_device {
> > > + const struct ths_thermal_chip *chip;
> > > + struct device *dev;
> > > + struct regmap *regmap;
> > > + struct reset_control *reset;
> > > + struct clk *bus_clk;
> > > + struct clk *mod_clk;
> > > + struct tsensor sensor[MAX_SENSOR_NUM];
> > > + u32 cp_ft_flag;
> > > +};
> > > +
> > > +/* Temp Unit: millidegree Celsius */
> > > +static int sun8i_ths_calc_temp(struct ths_device *tmdev,
> > > + int id, int reg)
> > > +{
> > > + return tmdev->chip->offset - (reg * tmdev->chip->scale / 10);
> > > +}
> > > +
> > > +static int sun50i_h5_calc_temp(struct ths_device *tmdev,
> > > + int id, int reg)
> > > +{
> > > + if (reg >= 0x500)
> > > + return -1191 * reg / 10 + 223000;
> > > + else if (!id)
> > > + return -1452 * reg / 10 + 259000;
> > > + else
> > > + return -1590 * reg / 10 + 276000;
> > > +}
> > > +
> > > +static int sun8i_ths_get_temp(void *data, int *temp)
> > > +{
> > > + struct tsensor *s = data;
> > > + struct ths_device *tmdev = s->tmdev;
> > > + int val = 0;
> > > +
> > > + regmap_read(tmdev->regmap, tmdev->chip->temp_data_base +
> > > + 0x4 * s->id, &val);
> > > +
> > > + /* ths have no data yet */
> > > + if (!val)
> > > + return -EAGAIN;
> > > +
> > > + *temp = tmdev->chip->calc_temp(tmdev, s->id, val);
> > > + /*
> > > + * According to the original sdk, there are some platforms(rarely)
> > > + * that add a fixed offset value after calculating the temperature
> > > + * value. We can't simply put it on the formula for calculating the
> > > + * temperature above, because the formula for calculating the
> > > + * temperature above is also used when the sensor is calibrated. If
> > > + * do this, the correct calibration formula is hard to know.
> > > + */
> > > + *temp += tmdev->chip->ft_deviation;
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static const struct thermal_zone_of_device_ops ths_ops = {
> > > + .get_temp = sun8i_ths_get_temp,
> > > +};
> > > +
> > > +static const struct regmap_config config = {
> > > + .reg_bits = 32,
> > > + .val_bits = 32,
> > > + .reg_stride = 4,
> > > + .fast_io = true,
> > > + .max_register = 0xfc,
> > > +};
> > > +
> > > +static int sun8i_h3_irq_ack(struct ths_device *tmdev)
> > > +{
> > > + int i, state, ret = 0;
> > > +
> > > + regmap_read(tmdev->regmap, SUN8I_THS_IS, &state);
> > > +
> > > + for (i = 0; i < tmdev->chip->sensor_num; i++) {
> > > + if (state & SUN8I_THS_DATA_IRQ_STS(i)) {
> > > + regmap_write(tmdev->regmap, SUN8I_THS_IS,
> > > + SUN8I_THS_DATA_IRQ_STS(i));
> > > + ret |= BIT(i);
> > > + }
> > > + }
> > > +
> > > + return ret;
> > > +}
> > > +
> > > +static int sun50i_h6_irq_ack(struct ths_device *tmdev)
> > > +{
> > > + int i, state, ret = 0;
> > > +
> > > + regmap_read(tmdev->regmap, SUN50I_H6_THS_DIS, &state);
> > > +
> > > + for (i = 0; i < tmdev->chip->sensor_num; i++) {
> > > + if (state & SUN50I_H6_THS_DATA_IRQ_STS(i)) {
> > > + regmap_write(tmdev->regmap, SUN50I_H6_THS_DIS,
> > > + SUN50I_H6_THS_DATA_IRQ_STS(i));
> > > + ret |= BIT(i);
> > > + }
> > > + }
> > > +
> > > + return ret;
> > > +}
> > > +
> > > +static irqreturn_t sun8i_irq_thread(int irq, void *data)
> > > +{
> > > + struct ths_device *tmdev = data;
> > > + int i, state;
> > > +
> > > + state = tmdev->chip->irq_ack(tmdev);
> > > +
> > > + for (i = 0; i < tmdev->chip->sensor_num; i++) {
> > > + if (state & BIT(i))
> > > + thermal_zone_device_update(tmdev->sensor[i].tzd,
> > > + THERMAL_EVENT_UNSPECIFIED);
> > > + }
> > > +
> > > + return IRQ_HANDLED;
> > > +}
> > > +
> > > +static int sun8i_h3_ths_calibrate(struct ths_device *tmdev,
> > > + u16 *caldata, int callen)
> > > +{
> > > + int i;
> > > +
> > > + if (!caldata[0] || callen < 2 * tmdev->chip->sensor_num)
> > > + return -EINVAL;
> > > +
> > > + for (i = 0; i < tmdev->chip->sensor_num; i++) {
> > > + int offset = (i % 2) << 4;
> > > +
> > > + regmap_update_bits(tmdev->regmap,
> > > + SUN8I_THS_TEMP_CALIB + (4 * (i >> 1)),
> > > + 0xfff << offset,
> > > + caldata[i] << offset);
> > > + }
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int sun50i_h6_ths_calibrate(struct ths_device *tmdev,
> > > + u16 *caldata, int callen)
> > > +{
> > > + struct device *dev = tmdev->dev;
> > > + int i, ft_temp;
> > > +
> > > + if (!caldata[0] || callen < 2 + 2 * tmdev->chip->sensor_num)
> > > + return -EINVAL;
> > > +
> > > + /*
> > > + * efuse layout:
> > > + *
> > > + * 0 11 16 32
> > > + * +-------+-------+-------+
> > > + * |temp| |sensor0|sensor1|
> > > + * +-------+-------+-------+
> > > + *
> > > + * The calibration data on the H6 is the ambient temperature and
> > > + * sensor values that are filled during the factory test stage.
> > > + *
> > > + * The unit of stored FT temperature is 0.1 degreee celusis.
> > > + *
> > > + * We need to calculate a delta between measured and caluclated
> > > + * register values and this will become a calibration offset.
> > > + */
> > > + ft_temp = (caldata[0] & FT_TEMP_MASK) * 100;
> > > + tmdev->cp_ft_flag = (caldata[0] & THS_EFUSE_CP_FT_MASK)
> > > + >> THS_EFUSE_CP_FT_BIT;
> >
> > Here got an unused data "cp_ft_flag",
> > which is used in the calculation of the temperature function according
> > to the source code.
> >
> > https://github.com/orangepi-xunlong/OrangePiH6_kernel/blob/master/drivers/thermal/sunxi_thermal/sunxi_ths_core.c#L392
>
> It should be used to enable the addition of ft_deviation in
> sun8i_ths_get_temp(), I guess. Probably an ommission. I guess most of H6
> chips will have this set anyway.
>
> > > +
> > > + for (i = 0; i < tmdev->chip->sensor_num; i++) {
> > > + int sensor_reg = caldata[i + 1];
> > > + int cdata, offset;
> > > + int sensor_temp = tmdev->chip->calc_temp(tmdev, i, sensor_reg);
> > > +
> > > + /*
> > > + * Calibration data is CALIBRATE_DEFAULT - (calculated
> > > + * temperature from sensor reading at factory temperature
> > > + * minus actual factory temperature) * 14.88 (scale from
> > > + * temperature to register values)
> > > + */
> > > + cdata = CALIBRATE_DEFAULT -
> > > + ((sensor_temp - ft_temp) * 10 / tmdev->chip->scale);
> >
> > Why change the formula here.
> >
> > https://github.com/orangepi-xunlong/OrangePiH6_kernel/blob/master/drivers/thermal/sunxi_thermal/sunxi_ths_core.c#L339
>
HI,
I suggest keeping you as it was before this patch, just change this
place to this.
cdata = CALIBRATE_DEFAULT - ((ft_temp * 100 - sensor_temp) /
tmdev->chip->scale);
Yangtao
> It looks the same to me as before. Here's the original patch:
>
> https://megous.com/git/linux/commit/?h=ths-5.4&id=cae28a7dfa6fc79ba37e31d4dff281947247e822
>
> It's basicaly to avoid magic values TEMP_TO_REG and use what's defined
> in the chip struct.
>
> regards,
> o.
>
> > > + if (cdata & ~TEMP_CALIB_MASK) {
> > > + /*
> > > + * Calibration value more than 12-bit, but calibration
> > > + * register is 12-bit. In this case, ths hardware can
> > > + * still work without calibration, although the data
> > > + * won't be so accurate.
> > > + */
> > > + dev_warn(dev, "sensor%d is not calibrated.\n", i);
> > > + continue;
> > > + }
> > > +
> > > + offset = (i % 2) * 16;
> > > + regmap_update_bits(tmdev->regmap,
> > > + SUN50I_H6_THS_TEMP_CALIB + (i / 2 * 4),
> > > + 0xfff << offset,
> > > + cdata << offset);
> > > + }
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int sun8i_ths_calibrate(struct ths_device *tmdev)
> > > +{
> > > + struct nvmem_cell *calcell;
> > > + struct device *dev = tmdev->dev;
> > > + u16 *caldata;
> > > + size_t callen;
> > > + int ret = 0;
> > > +
> > > + calcell = devm_nvmem_cell_get(dev, "calibration");
> > > + if (IS_ERR(calcell)) {
> > > + if (PTR_ERR(calcell) == -EPROBE_DEFER)
> > > + return -EPROBE_DEFER;
> > > + /*
> > > + * Even if the external calibration data stored in sid is
> > > + * not accessible, the THS hardware can still work, although
> > > + * the data won't be so accurate.
> > > + *
> > > + * The default value of calibration register is 0x800 for
> > > + * every sensor, and the calibration value is usually 0x7xx
> > > + * or 0x8xx, so they won't be away from the default value
> > > + * for a lot.
> > > + *
> > > + * So here we do not return error if the calibartion data is
> > > + * not available, except the probe needs deferring.
> > > + */
> > > + goto out;
> > > + }
> > > +
> > > + caldata = nvmem_cell_read(calcell, &callen);
> > > + if (IS_ERR(caldata)) {
> > > + ret = PTR_ERR(caldata);
> > > + goto out;
> > > + }
> > > +
> > > + tmdev->chip->calibrate(tmdev, caldata, callen);
> > > +
> > > + kfree(caldata);
> > > +out:
> > > + return ret;
> > > +}
> > > +
> > > +static int sun8i_ths_resource_init(struct ths_device *tmdev)
> > > +{
> > > + struct device *dev = tmdev->dev;
> > > + struct platform_device *pdev = to_platform_device(dev);
> > > + struct resource *mem;
> > > + void __iomem *base;
> > > + int ret;
> > > +
> > > + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > > + base = devm_ioremap_resource(dev, mem);
> > > + if (IS_ERR(base))
> > > + return PTR_ERR(base);
> > > +
> > > + tmdev->regmap = devm_regmap_init_mmio(dev, base, &config);
> > > + if (IS_ERR(tmdev->regmap))
> > > + return PTR_ERR(tmdev->regmap);
> > > +
> > > + if (tmdev->chip->has_bus_clk_reset) {
> > > + tmdev->reset = devm_reset_control_get(dev, 0);
> > > + if (IS_ERR(tmdev->reset))
> > > + return PTR_ERR(tmdev->reset);
> > > +
> > > + tmdev->bus_clk = devm_clk_get(&pdev->dev, "bus");
> > > + if (IS_ERR(tmdev->bus_clk))
> > > + return PTR_ERR(tmdev->bus_clk);
> > > + }
> > > +
> > > + if (tmdev->chip->has_mod_clk) {
> > > + tmdev->mod_clk = devm_clk_get(&pdev->dev, "mod");
> > > + if (IS_ERR(tmdev->mod_clk))
> > > + return PTR_ERR(tmdev->mod_clk);
> > > + }
> > > +
> > > + ret = reset_control_deassert(tmdev->reset);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + ret = clk_prepare_enable(tmdev->bus_clk);
> > > + if (ret)
> > > + goto assert_reset;
> > > +
> > > + ret = clk_set_rate(tmdev->mod_clk, 24000000);
> > > + if (ret)
> > > + goto bus_disable;
> > > +
> > > + ret = clk_prepare_enable(tmdev->mod_clk);
> > > + if (ret)
> > > + goto bus_disable;
> > > +
> > > + ret = sun8i_ths_calibrate(tmdev);
> > > + if (ret)
> > > + goto mod_disable;
> > > +
> > > + return 0;
> > > +
> > > +mod_disable:
> > > + clk_disable_unprepare(tmdev->mod_clk);
> > > +bus_disable:
> > > + clk_disable_unprepare(tmdev->bus_clk);
> > > +assert_reset:
> > > + reset_control_assert(tmdev->reset);
> > > +
> > > + return ret;
> > > +}
> > > +
> > > +static int sun8i_h3_thermal_init(struct ths_device *tmdev)
> > > +{
> > > + int val;
> > > +
> > > + /* average over 4 samples */
> > > + regmap_write(tmdev->regmap, SUN8I_THS_MFC,
> > > + SUN50I_THS_FILTER_EN |
> > > + SUN50I_THS_FILTER_TYPE(1));
> > > + /*
> > > + * clkin = 24MHz
> > > + * filter_samples = 4
> > > + * period = 0.25s
> > > + *
> > > + * x = period * clkin / 4096 / filter_samples - 1
> > > + * = 365
> > > + */
> > > + val = GENMASK(7 + tmdev->chip->sensor_num, 8);
> > > + regmap_write(tmdev->regmap, SUN8I_THS_IC,
> > > + SUN50I_H6_THS_PC_TEMP_PERIOD(365) | val);
> > > + /*
> > > + * T_acq = 20us
> > > + * clkin = 24MHz
> > > + *
> > > + * x = T_acq * clkin - 1
> > > + * = 479
> > > + */
> > > + regmap_write(tmdev->regmap, SUN8I_THS_CTRL0,
> > > + SUN8I_THS_CTRL0_T_ACQ0(479));
> > > + val = GENMASK(tmdev->chip->sensor_num - 1, 0);
> > > + regmap_write(tmdev->regmap, SUN8I_THS_CTRL2,
> > > + SUN8I_THS_CTRL2_T_ACQ1(479) | val);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +/*
> > > + * Without this undocummented value, the returned temperatures would
> > > + * be higher than real ones by about 20C.
> > > + */
> > > +#define SUN50I_H6_CTRL0_UNK 0x0000002f
> > > +
> > > +static int sun50i_h6_thermal_init(struct ths_device *tmdev)
> > > +{
> > > + int val;
> > > +
> > > + /*
> > > + * T_acq = 20us
> > > + * clkin = 24MHz
> > > + *
> > > + * x = T_acq * clkin - 1
> > > + * = 479
> > > + */
> > > + regmap_write(tmdev->regmap, SUN50I_THS_CTRL0,
> > > + SUN50I_H6_CTRL0_UNK | SUN50I_THS_CTRL0_T_ACQ(479));
> > > + /* average over 4 samples */
> > > + regmap_write(tmdev->regmap, SUN50I_H6_THS_MFC,
> > > + SUN50I_THS_FILTER_EN |
> > > + SUN50I_THS_FILTER_TYPE(1));
> > > + /*
> > > + * clkin = 24MHz
> > > + * filter_samples = 4
> > > + * period = 0.25s
> > > + *
> > > + * x = period * clkin / 4096 / filter_samples - 1
> > > + * = 365
> > > + */
> > > + regmap_write(tmdev->regmap, SUN50I_H6_THS_PC,
> > > + SUN50I_H6_THS_PC_TEMP_PERIOD(365));
> > > + /* enable sensor */
> > > + val = GENMASK(tmdev->chip->sensor_num - 1, 0);
> > > + regmap_write(tmdev->regmap, SUN50I_H6_THS_ENABLE, val);
> > > + /* thermal data interrupt enable */
> > > + val = GENMASK(tmdev->chip->sensor_num - 1, 0);
> > > + regmap_write(tmdev->regmap, SUN50I_H6_THS_DIC, val);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int sun8i_ths_register(struct ths_device *tmdev)
> > > +{
> > > + int i;
> > > +
> > > + for (i = 0; i < tmdev->chip->sensor_num; i++) {
> > > + tmdev->sensor[i].tmdev = tmdev;
> > > + tmdev->sensor[i].id = i;
> > > + tmdev->sensor[i].tzd =
> > > + devm_thermal_zone_of_sensor_register(tmdev->dev,
> > > + i,
> > > + &tmdev->sensor[i],
> > > + &ths_ops);
> > > + if (IS_ERR(tmdev->sensor[i].tzd))
> > > + return PTR_ERR(tmdev->sensor[i].tzd);
> > > + }
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int sun8i_ths_probe(struct platform_device *pdev)
> > > +{
> > > + struct ths_device *tmdev;
> > > + struct device *dev = &pdev->dev;
> > > + int ret, irq;
> > > +
> > > + tmdev = devm_kzalloc(dev, sizeof(*tmdev), GFP_KERNEL);
> > > + if (!tmdev)
> > > + return -ENOMEM;
> > > +
> > > + tmdev->dev = dev;
> > > + tmdev->chip = of_device_get_match_data(&pdev->dev);
> > > + if (!tmdev->chip)
> > > + return -EINVAL;
> > > +
> > > + platform_set_drvdata(pdev, tmdev);
> > > +
> > > + ret = sun8i_ths_resource_init(tmdev);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + irq = platform_get_irq(pdev, 0);
> > > + if (irq < 0)
> > > + return irq;
> > > +
> > > + ret = tmdev->chip->init(tmdev);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + ret = sun8i_ths_register(tmdev);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + /*
> > > + * Avoid entering the interrupt handler, the thermal device is not
> > > + * registered yet, we deffer the registration of the interrupt to
> > > + * the end.
> > > + */
> > > + ret = devm_request_threaded_irq(dev, irq, NULL,
> > > + sun8i_irq_thread,
> > > + IRQF_ONESHOT, "ths", tmdev);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + return ret;
> > > +}
> > > +
> > > +static int sun8i_ths_remove(struct platform_device *pdev)
> > > +{
> > > + struct ths_device *tmdev = platform_get_drvdata(pdev);
> > > +
> > > + clk_disable_unprepare(tmdev->mod_clk);
> > > + clk_disable_unprepare(tmdev->bus_clk);
> > > + reset_control_assert(tmdev->reset);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static const struct ths_thermal_chip sun8i_a83t_ths = {
> > > + .sensor_num = 3,
> > > + .scale = 705,
> > > + .offset = 191668,
> > > + .temp_data_base = SUN8I_THS_TEMP_DATA,
> > > + .calibrate = sun8i_h3_ths_calibrate,
> > > + .init = sun8i_h3_thermal_init,
> > > + .irq_ack = sun8i_h3_irq_ack,
> > > + .calc_temp = sun8i_ths_calc_temp,
> > > +};
> > > +
> > > +static const struct ths_thermal_chip sun8i_h3_ths = {
> > > + .sensor_num = 1,
> > > + .scale = 1211,
> > > + .offset = 217000,
> > > + .has_mod_clk = true,
> > > + .has_bus_clk_reset = true,
> > > + .temp_data_base = SUN8I_THS_TEMP_DATA,
> > > + .calibrate = sun8i_h3_ths_calibrate,
> > > + .init = sun8i_h3_thermal_init,
> > > + .irq_ack = sun8i_h3_irq_ack,
> > > + .calc_temp = sun8i_ths_calc_temp,
> > > +};
> > > +
> > > +static const struct ths_thermal_chip sun8i_r40_ths = {
> > > + .sensor_num = 3,
> > > + .offset = 251086,
> > > + .scale = 1130,
> > > + .has_mod_clk = true,
> > > + .has_bus_clk_reset = true,
> > > + .temp_data_base = SUN8I_THS_TEMP_DATA,
> > > + .calibrate = sun8i_h3_ths_calibrate,
> > > + .init = sun8i_h3_thermal_init,
> > > + .irq_ack = sun8i_h3_irq_ack,
> > > + .calc_temp = sun8i_ths_calc_temp,
> > > +};
> > > +
> > > +static const struct ths_thermal_chip sun50i_a64_ths = {
> > > + .sensor_num = 3,
> > > + .offset = 253890,
> > > + .scale = 1170,
> > > + .has_mod_clk = true,
> > > + .has_bus_clk_reset = true,
> > > + .temp_data_base = SUN8I_THS_TEMP_DATA,
> > > + .calibrate = sun8i_h3_ths_calibrate,
> > > + .init = sun8i_h3_thermal_init,
> > > + .irq_ack = sun8i_h3_irq_ack,
> > > + .calc_temp = sun8i_ths_calc_temp,
> > > +};
> > > +
> > > +static const struct ths_thermal_chip sun50i_h5_ths = {
> > > + .sensor_num = 2,
> > > + .has_mod_clk = true,
> > > + .has_bus_clk_reset = true,
> > > + .temp_data_base = SUN8I_THS_TEMP_DATA,
> > > + .calibrate = sun8i_h3_ths_calibrate,
> > > + .init = sun8i_h3_thermal_init,
> > > + .irq_ack = sun8i_h3_irq_ack,
> > > + .calc_temp = sun50i_h5_calc_temp,
> > > +};
> > > +
> > > +static const struct ths_thermal_chip sun50i_h6_ths = {
> > > + .sensor_num = 2,
> > > + .has_bus_clk_reset = true,
> > > + .ft_deviation = 7000,
> > > + .offset = 187744,
> > > + .scale = 672,
> > > + .temp_data_base = SUN50I_H6_THS_TEMP_DATA,
> > > + .calibrate = sun50i_h6_ths_calibrate,
> > > + .init = sun50i_h6_thermal_init,
> > > + .irq_ack = sun50i_h6_irq_ack,
> > > + .calc_temp = sun8i_ths_calc_temp,
> > > +};
> > > +
> > > +static const struct of_device_id of_ths_match[] = {
> > > + { .compatible = "allwinner,sun8i-a83t-ths", .data = &sun8i_a83t_ths },
> > > + { .compatible = "allwinner,sun8i-h3-ths", .data = &sun8i_h3_ths },
> > > + { .compatible = "allwinner,sun8i-r40-ths", .data = &sun8i_r40_ths },
> > > + { .compatible = "allwinner,sun50i-a64-ths", .data = &sun50i_a64_ths },
> > > + { .compatible = "allwinner,sun50i-h5-ths", .data = &sun50i_h5_ths },
> > > + { .compatible = "allwinner,sun50i-h6-ths", .data = &sun50i_h6_ths },
> > > + { /* sentinel */ },
> > > +};
> > > +MODULE_DEVICE_TABLE(of, of_ths_match);
> > > +
> > > +static struct platform_driver ths_driver = {
> > > + .probe = sun8i_ths_probe,
> > > + .remove = sun8i_ths_remove,
> > > + .driver = {
> > > + .name = "sun8i-thermal",
> > > + .of_match_table = of_ths_match,
> > > + },
> > > +};
> > > +module_platform_driver(ths_driver);
> > > +
> > > +MODULE_DESCRIPTION("Thermal sensor driver for Allwinner SOC");
> > > +MODULE_LICENSE("GPL v2");
> > > --
> > > 2.24.0
> > >
> >
> > Thx,
> > Yangtao
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