Re: [PATCH 2/3] thermal: Add Mediatek thermal controller support

Daniel Kurtz
2015-07-21T15:13:48Z

Hi Sascha,

Review comments inline...

On Tue, Jul 21, 2015 at 3:59 PM, Sascha Hauer <s.hauer@pengutronix.de> wrote:
> This adds support for the Mediatek thermal controller found on MT8173
> and likely other SoCs.
> The controller is a bit special. It does not have its own ADC, instead
> it controls the on-SoC AUXADC via AHB bus accesses. For this reason
> we need the physical address of the AUXADC. Also it controls a mux
> using AHB bus accesses, so we need the APMIXEDSYS physical address aswell.
>
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
> ---
> .../bindings/thermal/mediatek-thermal.txt | 8 +-
> drivers/thermal/Kconfig | 8 +
> drivers/thermal/Makefile | 1 +
> drivers/thermal/mtk_thermal.c | 602 +++++++++++++++++++++
> 4 files changed, 615 insertions(+), 4 deletions(-)
> create mode 100644 drivers/thermal/mtk_thermal.c
>
> diff --git a/Documentation/devicetree/bindings/thermal/mediatek-thermal.txt b/Documentation/devicetree/bindings/thermal/mediatek-thermal.txt
> index d90e4dc..c425a0f 100644
> --- a/Documentation/devicetree/bindings/thermal/mediatek-thermal.txt
> +++ b/Documentation/devicetree/bindings/thermal/mediatek-thermal.txt
> @@ -18,8 +18,8 @@ Required properties:
> - resets, reset-names: Reference to the reset controller controlling the thermal
> controller. Required reset-names:
> "therm": The main reset line
> -- auxadc: A phandle to the AUXADC which the thermal controller uses
> -- apmixedsys: A phandle to the APMIXEDSYS controller.
> +- mediatek,auxadc: A phandle to the AUXADC which the thermal controller uses
> +- mediatek,apmixedsys: A phandle to the APMIXEDSYS controller.
> - #thermal-sensor-cells : Should be 1. See ./thermal.txt for a description

I think you meant to squash these Documentation hunks into patch 1.

>
> Example:
> @@ -33,6 +33,6 @@ Example:
> clock-names = "therm", "auxadc";
> resets = <&pericfg MT8173_PERI_THERM_SW_RST>;
> reset-names = "therm";
> - auxadc = <&auxadc>;
> - apmixedsys = <&apmixedsys>;
> + mediatek,auxadc = <&auxadc>;
> + mediatek,apmixedsys = <&apmixedsys>;
> };
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 118938e..07ad114 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -340,6 +340,14 @@ config ACPI_THERMAL_REL
> tristate
> depends on ACPI
>
> +config MTK_THERMAL
> + tristate "Temperature sensor driver for mediatek SoCs"
> + depends on ARCH_MEDIATEK || COMPILE_TEST
> + default y
> + help
> + Enable this option if you want to have support for thermal management
> + controller present in Mediatek SoCs
> +
> menu "Texas Instruments thermal drivers"
> source "drivers/thermal/ti-soc-thermal/Kconfig"
> endmenu
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index 535dfee..cc1cab3 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -44,3 +44,4 @@ obj-$(CONFIG_INT340X_THERMAL) += int340x_thermal/
> obj-$(CONFIG_ST_THERMAL) += st/
> obj-$(CONFIG_TEGRA_SOCTHERM) += tegra_soctherm.o
> obj-$(CONFIG_HISI_THERMAL) += hisi_thermal.o
> +obj-$(CONFIG_MTK_THERMAL) += mtk_thermal.o
> diff --git a/drivers/thermal/mtk_thermal.c b/drivers/thermal/mtk_thermal.c
> new file mode 100644
> index 0000000..2f177b5
> --- /dev/null
> +++ b/drivers/thermal/mtk_thermal.c
> @@ -0,0 +1,602 @@
> +/*
> + * Copyright (c) 2014 MediaTek Inc.
> + * Author: Hanyi.Wu <hanyi.wu@mediatek.com>

Should this patch be SOB by Hanyi.Wu <hanyi.wu@mediatek.com> ?

> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/dmi.h>
> +#include <linux/thermal.h>
> +#include <linux/platform_device.h>
> +#include <linux/types.h>
> +#include <linux/delay.h>
> +#include <linux/slab.h>
> +#include <linux/clk.h>
> +#include <linux/time.h>
> +#include <linux/of.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_address.h>
> +#include <linux/interrupt.h>
> +#include <linux/reset.h>

nit: some folks like to see #includes alphabetized.

> +
> +/* AUXADC Registers */
> +#define AUXADC_CON0_V 0x000
> +#define AUXADC_CON1_V 0x004
> +#define AUXADC_CON1_SET_V 0x008
> +#define AUXADC_CON1_CLR_V 0x00c
> +#define AUXADC_CON2_V 0x010
> +#define AUXADC_DATA(channel) (0x14 + (channel) * 4)
> +#define AUXADC_MISC_V 0x094
> +
> +#define AUXADC_CON1_CHANNEL(x) (1 << (x))

Or just use BIT() ?

> +
> +/* Thermal Controller Registers */
> +#define TEMPMONCTL0 0x000

nit: "TEMP_" might makes these register names a bit more readable.

> +#define TEMPMONCTL1 0x004
> +#define TEMPMONCTL2 0x008
> +#define TEMPMONINT 0x00c
> +#define TEMPMONINTSTS 0x010
> +#define TEMPMONIDET0 0x014
> +#define TEMPMONIDET1 0x018
> +#define TEMPMONIDET2 0x01c
> +#define TEMPH2NTHRE 0x024
> +#define TEMPHTHRE 0x028
> +#define TEMPCTHRE 0x02c
> +#define TEMPOFFSETH 0x030
> +#define TEMPOFFSETL 0x034
> +#define TEMPMSRCTL0 0x038
> +#define TEMPMSRCTL1 0x03c
> +#define TEMPAHBPOLL 0x040
> +#define TEMPAHBTO 0x044
> +#define TEMPADCPNP0 0x048
> +#define TEMPADCPNP1 0x04c
> +#define TEMPADCPNP2 0x050
> +#define TEMPADCPNP3 0x0b4
> +
> +#define TEMPADCMUX 0x054
> +#define TEMPADCEXT 0x058
> +#define TEMPADCEXT1 0x05c
> +#define TEMPADCEN 0x060
> +#define TEMPPNPMUXADDR 0x064
> +#define TEMPADCMUXADDR 0x068
> +#define TEMPADCEXTADDR 0x06c
> +#define TEMPADCEXT1ADDR 0x070
> +#define TEMPADCENADDR 0x074
> +#define TEMPADCVALIDADDR 0x078
> +#define TEMPADCVOLTADDR 0x07c
> +#define TEMPRDCTRL 0x080
> +#define TEMPADCVALIDMASK 0x084
> +#define TEMPADCVOLTAGESHIFT 0x088
> +#define TEMPADCWRITECTRL 0x08c
> +#define TEMPMSR0 0x090
> +#define TEMPMSR1 0x094
> +#define TEMPMSR2 0x098
> +#define TEMPMSR3 0x0B8
> +
> +#define TEMPIMMD0 0x0a0
> +#define TEMPIMMD1 0x0a4
> +#define TEMPIMMD2 0x0a8
> +
> +#define TEMPPROTCTL 0x0c0
> +#define TEMPPROTTA 0x0c4
> +#define TEMPPROTTB 0x0c8
> +#define TEMPPROTTC 0x0cc
> +
> +#define TEMPSPARE0 0x0f0
> +#define TEMPSPARE1 0x0f4
> +#define TEMPSPARE2 0x0f8
> +#define TEMPSPARE3 0x0fc
> +
> +#define PTPCORESEL 0x400
> +#define THERMINTST 0x404
> +#define PTPODINTST 0x408
> +#define THSTAGE0ST 0x40c
> +#define THSTAGE1ST 0x410
> +#define THSTAGE2ST 0x414
> +#define THAHBST0 0x418
> +#define THAHBST1 0x41c /* Only for DE debug */
> +#define PTPSPARE0 0x420
> +#define PTPSPARE1 0x424
> +#define PTPSPARE2 0x428
> +#define PTPSPARE3 0x42c
> +#define THSLPEVEB 0x430
> +
> +#define TEMPMONINT_COLD(sp) ((1 << 0) << ((sp) * 5))
> +#define TEMPMONINT_HOT(sp) ((1 << 1) << ((sp) * 5))
> +#define TEMPMONINT_LOW_OFS(sp) ((1 << 2) << ((sp) * 5))
> +#define TEMPMONINT_HIGH_OFS(sp) ((1 << 3) << ((sp) * 5))
> +#define TEMPMONINT_HOT_TO_NORM(sp) ((1 << 4) << ((sp) * 5))
> +#define TEMPMONINT_TIMEOUT (1 << 15)
> +#define TEMPMONINT_IMMEDIATE_SENSE(sp) (1 << (16 + (sp)))
> +#define TEMPMONINT_FILTER_SENSE(sp) (1 << (19 + (sp)))

Some clever use of BIT() could clean these up.

> +
> +#define TEMPADCWRITECTRL_ADC_PNP_WRITE (1 << 0)
> +#define TEMPADCWRITECTRL_ADC_MUX_WRITE (1 << 1)
> +#define TEMPADCWRITECTRL_ADC_EXTRA_WRITE (1 << 2)
> +#define TEMPADCWRITECTRL_ADC_EXTRA1_WRITE (1 << 3)

BIT()

> +
> +#define TEMPADCVALIDMASK_VALID_HIGH (1 << 5)
> +#define TEMPADCVALIDMASK_VALID_POS(bit) (bit)
> +
> +#define TEMPPROTCTL_AVERAGE (0 << 16)
> +#define TEMPPROTCTL_MAXIMUM (1 << 16)
> +#define TEMPPROTCTL_SELECTED (2 << 16)
> +
> +#define MT8173_THERMAL_ZONE_CA57 0
> +#define MT8173_THERMAL_ZONE_CA53 1
> +#define MT8173_THERMAL_ZONE_GPU 2
> +#define MT8173_THERMAL_ZONE_CORE 3

These 4 MT8173_THERMAL_ZONE_* defines are not used.
Do they refer to the same zones as "MT8173_TS1", etc?
If so, I actually like them better, since they are more descriptive.

> +
> +#define MT8173_TS1 0
> +#define MT8173_TS2 1
> +#define MT8173_TS3 2
> +#define MT8173_TS4 3
> +#define MT8173_TSABB 4
> +
> +/* AUXADC channel 11 is used for the temperature sensors */
> +#define MT8173_TEMP_AUXADC_CHANNEL 11
> +
> +/* The total number of temperature sensors in the MT8173 */
> +#define MT8173_NUM_SENSORS 5
> +
> +/* The number of banks in the MT8173 */
> +#define MT8173_NUM_BANKS 4
> +
> +/* The number of sensing points per bank */
> +#define MT8173_NUM_SENSING_POINTS 4
> +
> +#define THERMAL_NAME "mtk-thermal"
> +
> +struct mtk_thermal;
> +
> +struct mtk_thermal_bank {
> + struct mtk_thermal *mt;
> + struct thermal_zone_device *tz;
> + int id;
> +};
> +
> +struct mtk_thermal {
> + struct device *dev;
> + void __iomem *thermal_base;
> + void __iomem *auxadc_base;

auxadc_base is never used.

> +
> + u64 auxadc_phys_base;
> + u64 apmixed_phys_base;
> + struct reset_control *reset;

these three are only used during probe->bank_init(), so don't store
them in struct mtk_thermal.

> + struct clk *clk_peri_therm;
> + struct clk *clk_auxadc;
> +
> + struct mtk_thermal_bank banks[MT8173_NUM_BANKS];
> +
> + struct mutex lock;
> +
> + /* Calibration values */
> + s32 adc_ge;
> + s32 adc_oe;
> + s32 degc_cali;
> + s32 o_slope;
> + s32 vts;
> +};
> +
> +struct mtk_thermal_bank_cfg {
> + unsigned int enable_mask;

A simple sensor count would be more clear than enable_mask.

> + unsigned int sensors[4];

MT8173_NUM_SENSING_POINTS perhaps?

> +};
> +
> +static int sensor_mux_values[MT8173_NUM_SENSORS] = { 0, 1, 2, 3, 16 };
> +
> +/*
> + * The MT8173 thermal controller has four banks. Each bank can read up to
> + * four temperature sensors simultaneously. The MT8173 has a total of 5
> + * temperature sensors. We use each bank to measure a certain area of the
> + * SoC. Since TS2 is located centrally in the SoC it is influenced by multiple
> + * areas, hence is used in different banks.
> + */
> +static struct mtk_thermal_bank_cfg bank_data[] = {

static const struct

> + {
> + .enable_mask = 3,
> + .sensors = { MT8173_TS2, MT8173_TS3 },
> + }, {
> + .enable_mask = 3,
> + .sensors = { MT8173_TS2, MT8173_TS4 },
> + }, {
> + .enable_mask = 7,
> + .sensors = { MT8173_TS1, MT8173_TS2, MT8173_TSABB },
> + }, {
> + .enable_mask = 1,
> + .sensors = { MT8173_TS2 },
> + },
> +};
> +
> +static int tempmsr_ofs[MT8173_NUM_SENSING_POINTS] = {
const
> + TEMPMSR0, TEMPMSR1, TEMPMSR2, TEMPMSR3
> +};
> +
> +static int tempadcpnp_ofs[MT8173_NUM_SENSING_POINTS] = {
const
> + TEMPADCPNP0, TEMPADCPNP1, TEMPADCPNP2, TEMPADCPNP3
> +};

These two arrays are tightly coupled, so perhaps it would be useful to
create a struct to represent a sense point:

struct mtk_thermal_sense_point {
int msr;
int adcpnp;
};

static const struct mtk_thermal_sense_point[MT8173_NUM_SENSING_POINTS] = {
{ TEMP_MSR0, TEMP_ADCPNP0 },
{ TEMP_MSR1, TEMP_ADCPNP1 },
{ TEMP_MSR2, TEMP_ADCPNP2 },
{ TEMP_MSR3, TEMP_ADCPNP3 },
};

> +
> +/**
> + * raw_to_mcelsius - convert a raw ADC value to mcelsius
> + * @mt: The thermal controller
> + * @raw: raw ADC value
> + *
> + * This converts the raw ADC value to mcelsius using the SoC specific
> + * calibration constants
> + */
> +static int raw_to_mcelsius(struct mtk_thermal *mt, u32 raw)
> +{
> + s32 format_1, format_2, format_3, format_4;

The formula would be easier to follow with better variable names than
"format_X".

> + s32 xtoomt;

What does "xtoomt" mean?

> + s32 gain;
> +
> + raw &= 0xfff;
> +
> + gain = (10000 + mt->adc_ge);

no outer ()

> +
> + xtoomt = ((((mt->vts + 3350 - mt->adc_oe) * 10000) / 4096) * 10000) /
> + gain;
> +
> + format_1 = ((mt->degc_cali * 10) >> 1);

When doing computations, I think "A / 2" is preferred over "A >> 1".
Also, no outer ().

> + format_2 = (raw - mt->adc_oe);
> + format_3 = (((((format_2) * 10000) >> 12) * 10000) / gain) - xtoomt;

This is just:
format_3 = ((((raw - mt->vts - 3350) * 10000) / 4096) * 10000) / gain;

No wonder mt->adc_oe = 512-512 = 0... it just cancels itself out here, anyway.

> + format_3 = format_3 * 15 / 18;

Of course we should multiply by 15/18!
What is going on here? Why this magic 5/6 ratio?

> + format_4 = ((format_3 * 100) / (165 + mt->o_slope));

no outer ()

> + format_4 = format_4 - (format_4 << 1);

Hmm...
A = X - 2*X;
otherwise known as:
A = -X;

> + return (format_1 + format_4) * 100;

Or just:
return (format_1 - format_4) * 100;

> +
> +}
> +
> +/**
> + * mtk_thermal_get_bank - get bank
> + * @bank: The bank
> + *
> + * The bank registers are banked, we have to select a bank in the
> + * PTPCORESEL register to access it.
> + */
> +static void mtk_thermal_get_bank(struct mtk_thermal_bank *bank)
> +{
> + struct mtk_thermal *mt = bank->mt;
> + u32 val;
> +
> + mutex_lock(&mt->lock);
> +
> + val = readl(mt->thermal_base + PTPCORESEL);
> + val &= ~0xf;
> + val |= bank->id;
> + writel(val, mt->thermal_base + PTPCORESEL);
> +}
> +
> +/**
> + * mtk_thermal_put_bank - release bank
> + * @bank: The bank
> + *
> + * release a bank previously taken with mtk_thermal_get_bank,
> + */
> +static void mtk_thermal_put_bank(struct mtk_thermal_bank *bank)
> +{
> + struct mtk_thermal *mt = bank->mt;
> +
> + mutex_unlock(&mt->lock);
> +}
> +
> +/**
> + * mtk_thermal_bank_temperature - get the temperature of a bank
> + * @bank: The bank
> + *
> + * The temperature of a bank is considered the maximum temperature of
> + * the sensors associated to the bank.
> + */
> +static int mtk_thermal_bank_temperature(struct mtk_thermal_bank *bank)
> +{
> + struct mtk_thermal *mt = bank->mt;
> + int temp, i, max;
> + u32 raw;
> +
> + temp = max = -INT_MAX;

nit: INT_MIN?

> +
> + for (i = 0; i < MT8173_NUM_SENSING_POINTS; i++) {

If enable_mask became sensor_count, this would become:

for (i = 0; i < bank_data[bank->id].sensor_count; i++) {

> + int sensno;
> +
> + if (!(bank_data[bank->id].enable_mask & (1 << i)))
> + continue;
> +
> + raw = readl(mt->thermal_base + tempmsr_ofs[i]);
> +
> + sensno = bank_data[bank->id].sensors[i];

sensno is set but not used.

> + temp = raw_to_mcelsius(mt, raw);
> +
> + if (temp > max)
> + max = temp;
> + }
> +
> + return max;
> +}
> +
> +static int mtk_read_temp(void *data, long *temp)
> +{
> + struct mtk_thermal_bank *bank = data;
> +
> + mtk_thermal_get_bank(bank);
> +
> + *temp = mtk_thermal_bank_temperature(bank);
> +
> + /*
> + * The first read of a sensor often contains very high bogus temperature
> + * value. Filter these out so that the system does not immediately shut
> + * down.
> + */
> + if (*temp > 200000)
> + *temp = 0;

Why not just put this limiter in mtk_thermal_bank_temperature(), and
discard bogus sense points?
Since mtk_thermal_bank_temperature() returns the max of all sense
points, any one bogus sense point will cause a bogus temperature.

> +
> + mtk_thermal_put_bank(bank);
> +
> + return 0;
> +}
> +
> +static const struct thermal_zone_of_device_ops mtk_thermal_ops = {
> + .get_temp = mtk_read_temp,
> +};
> +
> +static void mtk_thermal_init_bank(struct mtk_thermal_bank *bank)
> +{
> + struct mtk_thermal *mt = bank->mt;
> + struct mtk_thermal_bank_cfg *cfg = &bank_data[bank->id];
> + int i;
> +
> + mtk_thermal_get_bank(bank);
> +
> + /* bus clock 66M counting unit is 12 * 15.15ns * 256 = 46.540us */
> + writel(0x0000000c, mt->thermal_base + TEMPMONCTL1);

Please create some #defines for the register bits that are written in
this function.

> +
> + /*
> + * filt interval is 1 * 46.540us = 46.54us,
> + * sen interval is 429 * 46.540us = 19.96ms
> + */
> + writel(0x000101ad, mt->thermal_base + TEMPMONCTL2);
> +
> + /* poll is set to 10u */
> + writel(0x00000300, mt->thermal_base + TEMPAHBPOLL);
> +
> + /* temperature sampling control, 1 sample */
> + writel(0x00000000, mt->thermal_base + TEMPMSRCTL0);
> +
> + /* exceed this polling time, IRQ would be inserted */
> + writel(0xffffffff, mt->thermal_base + TEMPAHBTO);
> +
> + /* number of interrupts per event, 1 is enough */
> + writel(0x0, mt->thermal_base + TEMPMONIDET0);
> + writel(0x0, mt->thermal_base + TEMPMONIDET1);
> +
> + /*
> + * The MT8173 thermal controller does not have its own ADC. Instead it
> + * uses AHB bus accesses to control the AUXADC. To do this the thermal
> + * controller has to be programmed with the physical addresses of the
> + * AUXADC registers and with the various bit positions in the AUXADC.
> + * Also the thermal controller controls a mux in the APMIXEDSYS register
> + * space.
> + */
> +
> + /*
> + * this value will be stored to TEMPPNPMUXADDR (TEMPSPARE0)
> + * automatically by hw
> + */
> + writel(1 << MT8173_TEMP_AUXADC_CHANNEL, mt->thermal_base + TEMPADCMUX);
> +
> + /* AHB address for auxadc mux selection */
> + writel(mt->auxadc_phys_base + 0x00c,

Is this "0x00c" : AUXADC_CON1_CLR_V ?

Since auxadc_phys_base is only used during probe()->init_bank(), don't
store it in mt.

> + mt->thermal_base + TEMPADCMUXADDR);
> +
> + /* AHB address for pnp sensor mux selection */
> + writel(mt->apmixed_phys_base + 0x0604,

What is the name of the APMIXED register with offset "0x0604"?

Since apmixed_phys_base is only used during probe()->init_bank(),
don't store it in mt.

> + mt->thermal_base + TEMPPNPMUXADDR);
> +
> + /* AHB value for auxadc enable */
> + writel(1 << MT8173_TEMP_AUXADC_CHANNEL, mt->thermal_base + TEMPADCEN);
> +
> + /* AHB address for auxadc enable (channel 0 immediate mode selected) */
> + writel(mt->auxadc_phys_base + AUXADC_CON1_SET_V,
> + mt->thermal_base + TEMPADCENADDR);
> +
> + /* AHB address for auxadc valid bit */
> + writel(mt->auxadc_phys_base + AUXADC_DATA(MT8173_TEMP_AUXADC_CHANNEL),
> + mt->thermal_base + TEMPADCVALIDADDR);
> +
> + /* AHB address for auxadc voltage output */
> + writel(mt->auxadc_phys_base + AUXADC_DATA(MT8173_TEMP_AUXADC_CHANNEL),
> + mt->thermal_base + TEMPADCVOLTADDR);
> +
> + /* read valid & voltage are at the same register */
> + writel(0x0, mt->thermal_base + TEMPRDCTRL);
> +
> + /* indicate where the valid bit is */
> + writel(TEMPADCVALIDMASK_VALID_HIGH | TEMPADCVALIDMASK_VALID_POS(12),
> + mt->thermal_base + TEMPADCVALIDMASK);
> +
> + /* no shift */
> + writel(0x0, mt->thermal_base + TEMPADCVOLTAGESHIFT);
> +
> + /* enable auxadc mux write transaction */
> + writel(TEMPADCWRITECTRL_ADC_MUX_WRITE,
> + mt->thermal_base + TEMPADCWRITECTRL);
> +
> + for (i = 0; i < MT8173_NUM_SENSING_POINTS; i++)
> + writel(sensor_mux_values[cfg->sensors[i]],
> + mt->thermal_base + tempadcpnp_ofs[i]);

Not all banks use MT8173_NUM_SENSING_POINTS sensors.
If enable_mask became sensor_count, this could avoid writing
unnecessary registers:

for (i = 0; i < cfg->sensor_count; i++)

> +
> + writel(cfg->enable_mask, mt->thermal_base + TEMPMONCTL0);

And computing enable_mask from sensor_count is trivial:

GENMASK(cfg->sensor_count - 1, 0);

> +
> + writel(TEMPADCWRITECTRL_ADC_PNP_WRITE | TEMPADCWRITECTRL_ADC_MUX_WRITE,
> + mt->thermal_base + TEMPADCWRITECTRL);
> +
> + mtk_thermal_put_bank(bank);
> +}
> +
> +static u64 of_get_phys_base(struct device_node *np)
> +{
> + u64 size64;
> + const __be32 *regaddr_p;
> +
> + regaddr_p = of_get_address(np, 0, &size64, NULL);
> + if (!regaddr_p)
> + return OF_BAD_ADDR;
> +
> + return of_translate_address(np, regaddr_p);
> +}
> +
> +static int mtk_thermal_probe(struct platform_device *pdev)
> +{
> + int ret, i;
> + struct device_node *auxadc, *apmixedsys, *np = pdev->dev.of_node;
> + struct mtk_thermal *mt;
> + struct resource *res;
> +
> + mt = devm_kzalloc(&pdev->dev, sizeof(*mt), GFP_KERNEL);
> + if (!mt)
> + return -ENOMEM;
> +
> + mt->clk_peri_therm = devm_clk_get(&pdev->dev, "therm");
> + if (IS_ERR(mt->clk_peri_therm))
> + return PTR_ERR(mt->clk_peri_therm);
> +
> + mt->clk_auxadc = devm_clk_get(&pdev->dev, "auxadc");
> + if (IS_ERR(mt->clk_auxadc))
> + return PTR_ERR(mt->clk_auxadc);
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + mt->thermal_base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(mt->thermal_base))
> + return PTR_ERR(mt->thermal_base);
> +
> + mt->reset = devm_reset_control_get(&pdev->dev, "therm");
> + if (IS_ERR(mt->reset)) {
> + ret = PTR_ERR(mt->reset);
> + dev_err(&pdev->dev, "cannot get reset: %d\n", ret);
> + return ret;
> + }
> +
> + mutex_init(&mt->lock);
> +
> + mt->dev = &pdev->dev;
> +
> + auxadc = of_parse_phandle(np, "mediatek,auxadc", 0);
> + if (!auxadc) {
> + dev_err(&pdev->dev, "missing auxadc node\n");
> + return -ENODEV;
> + }
> +
> + mt->auxadc_phys_base = of_get_phys_base(auxadc);
> + if (mt->auxadc_phys_base == OF_BAD_ADDR) {
> + dev_err(&pdev->dev, "Can't get auxadc phys address\n");
> + return -EINVAL;
> + }
> +
> + apmixedsys = of_parse_phandle(np, "mediatek,apmixedsys", 0);
> + if (!apmixedsys) {
> + dev_err(&pdev->dev, "missing apmixedsys node\n");
> + return -ENODEV;
> + }
> +
> + mt->apmixed_phys_base = of_get_phys_base(apmixedsys);
> + if (mt->apmixed_phys_base == OF_BAD_ADDR) {
> + dev_err(&pdev->dev, "Can't get auxadc phys address\n");
> + return -EINVAL;
> + }
> +
> + ret = clk_prepare_enable(mt->clk_auxadc);
> + if (ret) {
> + dev_err(&pdev->dev, "Can't enable auxadc clk: %d\n", ret);
> + return ret;
> + }
> +
> + reset_control_reset(mt->reset);
> +
> + ret = clk_prepare_enable(mt->clk_peri_therm);
> + if (ret) {
> + dev_err(&pdev->dev, "Can't enable peri clk: %d\n", ret);
> + goto err_enable_clk;

I think labels are usually named by what they do, rather than what
causes the goto.
So, perhaps:

goto err_disable_clk_auxadc;

> + }
> +
> + /*
> + * These calibration values should finally be provided by the
> + * firmware or fuses. For now use default values.
> + */
> + mt->adc_ge = ((512 - 512) * 10000) / 4096;
> + mt->adc_oe = 512 - 512;
> + mt->degc_cali = 40;
> + mt->o_slope = 0;
> + mt->vts = 260;
> +
> + for (i = 0; i < MT8173_NUM_BANKS; i++) {
> + struct mtk_thermal_bank *bank = &mt->banks[i];
> +
> + bank->id = i;
> + bank->mt = mt;
> + mtk_thermal_init_bank(&mt->banks[i]);

I think this would work better as just:
mtk_thermal_init_bank(mt, i, apmixedsys_phys_base, auxadc_phys_base);

Setting "id" and "mt" out here doesn't add much value.

> + }
> +
> + platform_set_drvdata(pdev, mt);
> +
> + for (i = 0; i < MT8173_NUM_BANKS; i++) {
> + struct mtk_thermal_bank *bank = &mt->banks[i];
> +
> + bank->tz = thermal_zone_of_sensor_register(&pdev->dev, i, bank,
> + &mtk_thermal_ops);
> + }
> +
> + return 0;
> +
> +err_enable_clk:
> + clk_disable_unprepare(mt->clk_peri_therm);
> +
> + return ret;
> +}
> +
> +static int mtk_thermal_remove(struct platform_device *pdev)
> +{
> + struct mtk_thermal *mt = platform_get_drvdata(pdev);
> + int i;
> +
> + for (i = 0; i < MT8173_NUM_BANKS; i++) {
> + struct mtk_thermal_bank *bank = &mt->banks[i];
> +
> + if (!IS_ERR(bank))

How could this be true?

ok... enough for now :-)

Thanks,
-Dan

> + thermal_zone_of_sensor_unregister(&pdev->dev, bank->tz);
> + }
> +
> + clk_disable_unprepare(mt->clk_peri_therm);
> + clk_disable_unprepare(mt->clk_auxadc);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id mtk_thermal_of_match[] = {
> + {
> + .compatible = "mediatek,mt8173-thermal",
> + }, {
> + },
> +};
> +
> +static struct platform_driver mtk_thermal_driver = {
> + .probe = mtk_thermal_probe,
> + .remove = mtk_thermal_remove,
> + .driver = {
> + .name = THERMAL_NAME,
> + .of_match_table = mtk_thermal_of_match,
> + },
> +};
> +
> +module_platform_driver(mtk_thermal_driver);
> +
> +MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de");
> +MODULE_DESCRIPTION("Mediatek thermal driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.1.4
>
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