Re: [PATCH v6 1/7] thermal: sun8i: add thermal driver for H6/H5/H3/A64/A83T/R40

From: OndÅej Jirman
Date: Sun Dec 01 2019 - 20:58:58 EST

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On Fri, Nov 29, 2019 at 07:46:58PM +0800, Frank Lee wrote:
> On Fri, Nov 29, 2019 at 1:06 AM OndÅej Jirman <megous@xxxxxxxxxx> 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@xxxxxxxxx> wrote:
> > > >
> > > > From: Yangtao Li <tiny.windzz@xxxxxxxxx>
> > > >
> > > > 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@xxxxxxxxx>
> > > > Signed-off-by: Ondrej Jirman <megous@xxxxxxxxxx>
> > > > Signed-off-by: Vasily Khoruzhick <anarsoul@xxxxxxxxx>
> > > > ---
> > > > 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@xxxxxxxxxxxxxxx
> > > > S: Maintained
> > > > F: drivers/crypto/allwinner/
> > > >
> > > > +ALLWINNER THERMAL DRIVER
> > > > +M: Yangtao Li <tiny.windzz@xxxxxxxxx>
> > > > +L: linux-pm@xxxxxxxxxxxxxxx
> > > > +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@xxxxxxxxxx>
> > > > M: Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxx>
> > > > 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@xxxxxxx>
> > > > + * Based on the work of Ondrej Jirman <megous@xxxxxxxxxx>
> > > > + * Based on the work of Josef Gajdusek <atx@xxxxxxxx>
> > > > + */
> > > > +
> > > > +#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);

Hi,

any reason for your suggestion? I also changed scale to be 10* specifically to
allow it to be more precise when doing integer math, so that it more easily
supports A83T's value. H6's scale value is also needlessly rounded too much
without this change. With your suggestion, I'd have to round A83T's scale from
70.5 to either 70 or 71, but why?

regards,
o.

> 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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