Re: [PATCH v4 2/3] thermal: exynos_tmu: Support new hardware and update TMU interface

Henrik Grimler
2025-09-22T20:04:52Z

Hi Shin,

On Mon, Sep 22, 2025 at 01:18:56PM +0900, Shin Son wrote:
> The Exynos tmu driver's private data structure has been extended
> to support the exynosautov920 hardware, which requires per-sensor interrupt
> enablement and multiple-zone handling:
>
> - Add 'slope_comp' : compensation parameter below 25 degrees.
> - Add 'calib_temp' : stores the fused calibaration temperature.
> - Add 'sensor_count' : reflects the maximum sensor numbers.
> - Rename 'tzd' -> 'tzd_array' to register multiple thermal zones.
>
> Since splitting this patch causes runtime errors during temperature
> emulation or problems where the read temperature feature fails to
> retrieve values, I have submitted it as a single commit. To add support
> for the exynosautov920 to the exisiting TMU interface, the following
> changes are included:
>
> 1. Simplify "temp_to_code" and "code_to_temp" to one computation path
> by normalizing calib_temp.
> 2. Loop over 'sensor_count' in critical-point setup.
> 3. Introduce 'update_con_reg' for exynosautov920 control-register updates.
> 4. Add exynosautov920-specific branch in 'exynos_tmu_update_temp' function.
> 5. Skip high & low temperature threshold setup in exynosautov920.
> 6. Enable interrupts via sensor_count in exynosautov920.
> 7. Initialize all new members during 'exynosautov920_tmu_initialize'.
> 8. Clear IRQs by iterating the sensor_count in exynosautov920.
> 9. Register each zone with 'devm_thermal_of_zone_register()'
> based on 'sensor_count'.
>
> Signed-off-by: Shin Son <shin.son@samsung.com>
> ---
> drivers/thermal/samsung/exynos_tmu.c | 322 ++++++++++++++++++++++++---
> 1 file changed, 285 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index 47a99b3c5395..ebcc38f3fff6 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -121,8 +121,51 @@
>
> #define EXYNOS_NOISE_CANCEL_MODE 4
>
> +/* ExynosAutov920 specific registers */
> +#define EXYNOSAUTOV920_SLOPE_COMP 25
> +#define EXYNOSAUTOV920_SLOPE_COMP_MASK 0xf
> +#define EXYNOSAUTOV920_CALIB_SEL_TEMP 30
> +#define EXYNOSAUTOV920_CALIB_SEL_TEMP_MASK 0x2
> +
> +#define EXYNOSAUTOV920_SENSOR0_TRIM_INFO 0x10
> +#define EXYNOSAUTOV920_TRIM_MASK 0x1ff
> +#define EXYNOSAUTOV920_TRIMINFO_25_SHIFT 0
> +#define EXYNOSAUTOV920_TRIMINFO_85_SHIFT 9
> +
> +#define EXYNOSAUTOV920_TMU_REG_TRIMINFO2 0x04
> +
> +#define EXYNOSAUTOV920_TMU_REG_THRESHOLD(p) (((p)) * 0x50 + 0x00d0)
> +#define EXYNOSAUTOV920_TMU_REG_INTEN(p) (((p)) * 0x50 + 0x00f0)
> +#define EXYNOSAUTOV920_TMU_REG_INT_PEND(p) (((p)) * 0x50 + 0x00f8)
> +
> +#define EXYNOSAUTOV920_CURRENT_TEMP_P1_P0 0x084
> +#define EXYNOSAUTOV920_TMU_REG_EMUL_CON 0x0b0
> +
> +#define EXYNOSAUTOV920_TMU_REG_CONTROL 0x50
> +#define EXYNOSAUTOV920_TMU_REG_CONTROL1 0x54
> +#define EXYNOSAUTOV920_TMU_REG_AVG_CONTROL 0x58
> +#define EXYNOSAUTOV920_TMU_SAMPLING_INTERVAL 0x70
> +#define EXYNOSAUTOV920_TMU_REG_COUNTER_VALUE0 0x74
> +#define EXYNOSAUTOV920_TMU_REG_COUNTER_VALUE1 0x78
> +
> +#define EXYNOSAUTOV920_TMU_T_BUF_VREF_SEL_SHIFT 8
> +#define EXYNOSAUTOV920_TMU_T_BUF_VREF_SEL_MASK 0x1f
> +#define EXYNOSAUTOV920_TMU_T_BUF_SLOPE_SEL_SHIFT 3
> +#define EXYNOSAUTOV920_TMU_T_BUF_SLOPE_SEL_MASK 0xf
> +#define EXYNOSAUTOV920_TMU_NUM_PROBE_MASK 0xf
> +#define EXYNOSAUTOV920_TMU_NUM_PROBE_SHIFT 16
> +#define EXYNOSAUTOV920_TMU_LPI_MODE_MASK 1
> +#define EXYNOSAUTOV920_TMU_LPI_MODE_SHIFT 10
> +
> +#define EXYNOSAUTOV920_TMU_AVG_CON_UPDATE 0x0008011a
> +#define EXYNOSAUTOV920_TMU_COUNTER_VALUE0_UPDATE 0x030003c0
> +#define EXYNOSAUTOV920_TMU_COUNTER_VALUE1_UPDATE 0x03c0004d
> +
> #define MCELSIUS 1000
>
> +#define EXYNOS_DEFAULT_SENSOR_COUNT 1
> +#define EXYNOS_MAX_SENSOR_COUNT 16

In patch 1, sensor count is described as a value 0 <= sensor_count <=
15, but here max sensor count value is set to 16. Shouldn't max value
be the same in these two places, what is the maximum number of thermal
sensors that the hardware can have?

> enum soc_type {
> SOC_ARCH_EXYNOS3250 = 1,
> SOC_ARCH_EXYNOS4210,
> @@ -133,6 +176,7 @@ enum soc_type {
> SOC_ARCH_EXYNOS5420_TRIMINFO,
> SOC_ARCH_EXYNOS5433,
> SOC_ARCH_EXYNOS7,
> + SOC_ARCH_EXYNOSAUTOV920,
> };
>
> /**
> @@ -150,6 +194,8 @@ enum soc_type {
> * @efuse_value: SoC defined fuse value
> * @min_efuse_value: minimum valid trimming data
> * @max_efuse_value: maximum valid trimming data
> + * @slope_comp: allocated value of the slope compensation.
> + * @calib_temp: calibration temperature of the TMU.
> * @temp_error1: fused value of the first point trim.
> * @temp_error2: fused value of the second point trim.
> * @gain: gain of amplifier in the positive-TC generator block
> @@ -157,7 +203,8 @@ enum soc_type {
> * @reference_voltage: reference voltage of amplifier
> * in the positive-TC generator block
> * 0 < reference_voltage <= 31
> - * @tzd: pointer to thermal_zone_device structure
> + * @sensor_count: The maximum number of the sensors
> + * @tzd_array: pointer array of thermal_zone_device structure
> * @enabled: current status of TMU device
> * @tmu_set_low_temp: SoC specific method to set trip (falling threshold)
> * @tmu_set_high_temp: SoC specific method to set trip (rising threshold)
> @@ -174,6 +221,7 @@ struct exynos_tmu_data {
> void __iomem *base;
> void __iomem *base_second;
> int irq;
> + int sensor_count;
> enum soc_type soc;
> struct mutex lock;
> struct clk *clk, *clk_sec, *sclk;
> @@ -181,10 +229,12 @@ struct exynos_tmu_data {
> u32 efuse_value;
> u32 min_efuse_value;
> u32 max_efuse_value;
> + u16 slope_comp;
> + u16 calib_temp;
> u16 temp_error1, temp_error2;
> u8 gain;
> u8 reference_voltage;
> - struct thermal_zone_device *tzd;
> + struct thermal_zone_device *tzd_array[EXYNOS_MAX_SENSOR_COUNT];
> bool enabled;
>
> void (*tmu_set_low_temp)(struct exynos_tmu_data *data, u8 temp);
> @@ -205,13 +255,20 @@ struct exynos_tmu_data {
> */
> static int temp_to_code(struct exynos_tmu_data *data, u8 temp)
> {
> + s32 temp_diff, code;
> +
> if (data->cal_type == TYPE_ONE_POINT_TRIMMING)
> return temp + data->temp_error1 - EXYNOS_FIRST_POINT_TRIM;
>
> - return (temp - EXYNOS_FIRST_POINT_TRIM) *
> - (data->temp_error2 - data->temp_error1) /
> - (EXYNOS_SECOND_POINT_TRIM - EXYNOS_FIRST_POINT_TRIM) +
> - data->temp_error1;
> + temp_diff = temp - EXYNOS_FIRST_POINT_TRIM;
> +
> + code = temp_diff * (data->temp_error2 - data->temp_error1) * MCELSIUS /
> + (data->calib_temp - EXYNOS_FIRST_POINT_TRIM);
> +
> + if (data->soc == SOC_ARCH_EXYNOSAUTOV920 && temp_diff < 0)
> + code = code * (57 + data->slope_comp) / 65;
> +
> + return code / MCELSIUS + data->temp_error1;
> }
>
> /*
> @@ -220,13 +277,20 @@ static int temp_to_code(struct exynos_tmu_data *data, u8 temp)
> */
> static int code_to_temp(struct exynos_tmu_data *data, u16 temp_code)
> {
> + s32 code_diff, temp;
> +
> if (data->cal_type == TYPE_ONE_POINT_TRIMMING)
> return temp_code - data->temp_error1 + EXYNOS_FIRST_POINT_TRIM;
>
> - return (temp_code - data->temp_error1) *
> - (EXYNOS_SECOND_POINT_TRIM - EXYNOS_FIRST_POINT_TRIM) /
> - (data->temp_error2 - data->temp_error1) +
> - EXYNOS_FIRST_POINT_TRIM;
> + code_diff = temp_code - data->temp_error1;
> +
> + temp = code_diff * (data->calib_temp - EXYNOS_FIRST_POINT_TRIM) * MCELSIUS /
> + (data->temp_error2 - data->temp_error1);
> +
> + if (data->soc == SOC_ARCH_EXYNOSAUTOV920 && code_diff < 0)
> + temp = temp * 65 / (57 + data->slope_comp);
> +
> + return temp / MCELSIUS + EXYNOS_FIRST_POINT_TRIM;
> }

Nice, these two functions looks much better compared to v2!

> static void sanitize_temp_error(struct exynos_tmu_data *data, u32 trim_info)
> @@ -262,6 +326,9 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
> clk_enable(data->clk_sec);
>
> status = readb(data->base + EXYNOS_TMU_REG_STATUS);
> + if (data->soc == SOC_ARCH_EXYNOSAUTOV920)
> + status = readl(data->base + EXYNOS_TMU_REG_TRIMINFO);
> +
> if (!status) {
> ret = -EBUSY;
> } else {
> @@ -280,27 +347,34 @@ static int exynos_tmu_initialize(struct platform_device *pdev)
> static int exynos_thermal_zone_configure(struct platform_device *pdev)
> {
> struct exynos_tmu_data *data = platform_get_drvdata(pdev);
> - struct thermal_zone_device *tzd = data->tzd;
> - int ret, temp;
> + struct thermal_zone_device *tzd;
> + int ret, temp, idx;
>
> - ret = thermal_zone_get_crit_temp(tzd, &temp);
> - if (ret) {
> - /* FIXME: Remove this special case */
> - if (data->soc == SOC_ARCH_EXYNOS5433)
> - return 0;
> + for (idx = 0; idx < data->sensor_count; idx++) {
> + tzd = data->tzd_array[idx];
>
> - dev_err(&pdev->dev,
> - "No CRITICAL trip point defined in device tree!\n");
> - return ret;
> - }
> + if (!tzd)
> + continue;
>
> - mutex_lock(&data->lock);
> - clk_enable(data->clk);
> + ret = thermal_zone_get_crit_temp(tzd, &temp);
> + if (ret) {
> + /* FIXME: Remove this special case */
> + if (data->soc == SOC_ARCH_EXYNOS5433)
> + return 0;
>
> - data->tmu_set_crit_temp(data, temp / MCELSIUS);
> + dev_err(&pdev->dev,
> + "No CRITICAL trip point defined in device tree!\n");
> + return ret;
> + }
>
> - clk_disable(data->clk);
> - mutex_unlock(&data->lock);
> + mutex_lock(&data->lock);
> + clk_enable(data->clk);
> +
> + data->tmu_set_crit_temp(data, temp / MCELSIUS);
> +
> + clk_disable(data->clk);
> + mutex_unlock(&data->lock);
> + }
>
> return 0;
> }
> @@ -323,6 +397,37 @@ static u32 get_con_reg(struct exynos_tmu_data *data, u32 con)
> return con;
> }
>
> +static void update_con_reg(struct exynos_tmu_data *data)
> +{
> + u32 val, t_buf_vref_sel, t_buf_slope_sel;
> +
> + val = readl(data->base + EXYNOS_TMU_REG_TRIMINFO);
> + t_buf_vref_sel = (val >> EXYNOSAUTOV920_TMU_T_BUF_VREF_SEL_SHIFT)
> + & EXYNOSAUTOV920_TMU_T_BUF_VREF_SEL_MASK;
> + t_buf_slope_sel = (val >> EXYNOSAUTOV920_TMU_T_BUF_SLOPE_SEL_SHIFT)
> + & EXYNOSAUTOV920_TMU_T_BUF_SLOPE_SEL_MASK;
> +
> + val = readl(data->base + EXYNOSAUTOV920_TMU_REG_CONTROL);
> + val &= ~(EXYNOS_TMU_REF_VOLTAGE_MASK << EXYNOS_TMU_REF_VOLTAGE_SHIFT);
> + val |= (t_buf_vref_sel << EXYNOS_TMU_REF_VOLTAGE_SHIFT);
> + val &= ~(EXYNOS_TMU_BUF_SLOPE_SEL_MASK << EXYNOS_TMU_BUF_SLOPE_SEL_SHIFT);
> + val |= (t_buf_slope_sel << EXYNOS_TMU_BUF_SLOPE_SEL_SHIFT);
> + writel(val, data->base + EXYNOSAUTOV920_TMU_REG_CONTROL);
> +
> + val = readl(data->base + EXYNOSAUTOV920_TMU_REG_CONTROL1);
> + val &= ~(EXYNOSAUTOV920_TMU_NUM_PROBE_MASK << EXYNOSAUTOV920_TMU_NUM_PROBE_SHIFT);
> + val &= ~(EXYNOSAUTOV920_TMU_LPI_MODE_MASK << EXYNOSAUTOV920_TMU_LPI_MODE_SHIFT);
> + val |= (data->sensor_count << EXYNOSAUTOV920_TMU_NUM_PROBE_SHIFT);
> + writel(val, data->base + EXYNOSAUTOV920_TMU_REG_CONTROL1);
> +
> + writel(1, data->base + EXYNOSAUTOV920_TMU_SAMPLING_INTERVAL);
> + writel(EXYNOSAUTOV920_TMU_AVG_CON_UPDATE, data->base + EXYNOSAUTOV920_TMU_REG_AVG_CONTROL);
> + writel(EXYNOSAUTOV920_TMU_COUNTER_VALUE0_UPDATE,
> + data->base + EXYNOSAUTOV920_TMU_REG_COUNTER_VALUE0);
> + writel(EXYNOSAUTOV920_TMU_COUNTER_VALUE1_UPDATE,
> + data->base + EXYNOSAUTOV920_TMU_REG_COUNTER_VALUE1);
> +}
> +
> static void exynos_tmu_control(struct platform_device *pdev, bool on)
> {
> struct exynos_tmu_data *data = platform_get_drvdata(pdev);
> @@ -354,9 +459,8 @@ static void exynos_tmu_update_temp(struct exynos_tmu_data *data, int reg_off,
> u16 tmu_temp_mask;
> u32 th;
>
> - tmu_temp_mask =
> - (data->soc == SOC_ARCH_EXYNOS7) ? EXYNOS7_TMU_TEMP_MASK
> - : EXYNOS_TMU_TEMP_MASK;
> + tmu_temp_mask = (data->soc == SOC_ARCH_EXYNOS7 || data->soc == SOC_ARCH_EXYNOSAUTOV920)
> + ? EXYNOS7_TMU_TEMP_MASK : EXYNOS_TMU_TEMP_MASK;
>
> th = readl(data->base + reg_off);
> th &= ~(tmu_temp_mask << bit_off);
> @@ -582,6 +686,68 @@ static void exynos7_tmu_initialize(struct platform_device *pdev)
> sanitize_temp_error(data, trim_info);
> }
>
> +static void exynosautov920_tmu_set_low_temp(struct exynos_tmu_data *data, u8 temp)
> +{
> + /*
> + * Failing thresholds are not supported on Exynosautov920.
> + * We use polling instead.
> + */
> +}
> +
> +static void exynosautov920_tmu_set_high_temp(struct exynos_tmu_data *data, u8 temp)
> +{
> + /*
> + * Rising thresholds are not supported on Exynosautov920.
> + * We use polling instead.
> + */
> +}
> +
> +static void exynosautov920_tmu_disable_low(struct exynos_tmu_data *data)
> +{
> + /* Again, this is handled by polling. */
> +}
> +
> +static void exynosautov920_tmu_disable_high(struct exynos_tmu_data *data)
> +{
> + /* Again, this is handled by polling. */
> +}
> +
> +static void exynosautov920_tmu_set_crit_temp(struct exynos_tmu_data *data, u8 temp)
> +{
> + unsigned int idx;
> +
> + for (idx = 0; idx < data->sensor_count; idx++) {
> + if (!data->tzd_array[idx])
> + continue;
> +
> + exynos_tmu_update_temp(data, EXYNOSAUTOV920_TMU_REG_THRESHOLD(idx), 16, temp);
> + exynos_tmu_update_bit(data, EXYNOSAUTOV920_TMU_REG_INTEN(idx), 7, true);
> + }
> +}
> +
> +static void exynosautov920_tmu_initialize(struct platform_device *pdev)
> +{
> + struct exynos_tmu_data *data = platform_get_drvdata(pdev);
> + unsigned int val;
> +
> + data->tmu_control(pdev, false);
> +
> + update_con_reg(data);
> +
> + val = readl(data->base + EXYNOS_TMU_REG_TRIMINFO);
> + data->cal_type = TYPE_TWO_POINT_TRIMMING;
> + data->slope_comp = (val >> EXYNOSAUTOV920_SLOPE_COMP) & EXYNOSAUTOV920_SLOPE_COMP_MASK;
> +
> + val = readl(data->base + EXYNOSAUTOV920_SENSOR0_TRIM_INFO);
> + data->temp_error1 = (val >> EXYNOSAUTOV920_TRIMINFO_25_SHIFT) & EXYNOSAUTOV920_TRIM_MASK;
> + data->temp_error2 = (val >> EXYNOSAUTOV920_TRIMINFO_85_SHIFT) & EXYNOSAUTOV920_TRIM_MASK;
> +
> + val = readl(data->base + EXYNOSAUTOV920_TMU_REG_TRIMINFO2);
> + val = (val >> EXYNOSAUTOV920_CALIB_SEL_TEMP) & EXYNOSAUTOV920_CALIB_SEL_TEMP_MASK;
> +
> + data->calib_temp = (EXYNOS_SECOND_POINT_TRIM + (20 * val));
> +}
> +
> static void exynos4210_tmu_control(struct platform_device *pdev, bool on)
> {
> struct exynos_tmu_data *data = platform_get_drvdata(pdev);
> @@ -633,6 +799,24 @@ static void exynos7_tmu_control(struct platform_device *pdev, bool on)
> writel(con, data->base + EXYNOS_TMU_REG_CONTROL);
> }
>
> +static void exynosautov920_tmu_control(struct platform_device *pdev, bool on)
> +{
> + struct exynos_tmu_data *data = platform_get_drvdata(pdev);
> + unsigned int con;
> +
> + con = readl(data->base + EXYNOSAUTOV920_TMU_REG_CONTROL);
> +
> + if (on) {
> + con |= BIT(EXYNOS_TMU_THERM_TRIP_EN_SHIFT);
> + con |= BIT(EXYNOS_TMU_CORE_EN_SHIFT);
> + } else {
> + con &= ~BIT(EXYNOS_TMU_THERM_TRIP_EN_SHIFT);
> + con &= ~BIT(EXYNOS_TMU_CORE_EN_SHIFT);
> + }
> +
> + writel(con, data->base + EXYNOSAUTOV920_TMU_REG_CONTROL);
> +}
> +
> static int exynos_get_temp(struct thermal_zone_device *tz, int *temp)
> {
> struct exynos_tmu_data *data = thermal_zone_device_priv(tz);
> @@ -671,7 +855,7 @@ static u32 get_emul_con_reg(struct exynos_tmu_data *data, unsigned int val,
>
> val &= ~(EXYNOS_EMUL_TIME_MASK << EXYNOS_EMUL_TIME_SHIFT);
> val |= (EXYNOS_EMUL_TIME << EXYNOS_EMUL_TIME_SHIFT);
> - if (data->soc == SOC_ARCH_EXYNOS7) {
> + if (data->soc == SOC_ARCH_EXYNOS7 || data->soc == SOC_ARCH_EXYNOSAUTOV920) {
> val &= ~(EXYNOS7_EMUL_DATA_MASK <<
> EXYNOS7_EMUL_DATA_SHIFT);
> val |= (temp_to_code(data, temp) <<
> @@ -703,6 +887,8 @@ static void exynos4412_tmu_set_emulation(struct exynos_tmu_data *data,
> emul_con = EXYNOS5433_TMU_EMUL_CON;
> else if (data->soc == SOC_ARCH_EXYNOS7)
> emul_con = EXYNOS7_TMU_REG_EMUL_CON;
> + else if (data->soc == SOC_ARCH_EXYNOSAUTOV920)
> + emul_con = EXYNOSAUTOV920_TMU_REG_EMUL_CON;
> else
> emul_con = EXYNOS_EMUL_CON;
>
> @@ -756,11 +942,23 @@ static int exynos7_tmu_read(struct exynos_tmu_data *data)
> EXYNOS7_TMU_TEMP_MASK;
> }
>
> +static int exynosautov920_tmu_read(struct exynos_tmu_data *data)
> +{
> + return readw(data->base + EXYNOSAUTOV920_CURRENT_TEMP_P1_P0) &
> + EXYNOS7_TMU_TEMP_MASK;
> +}
> +
> static irqreturn_t exynos_tmu_threaded_irq(int irq, void *id)
> {
> struct exynos_tmu_data *data = id;
> + int idx;
>
> - thermal_zone_device_update(data->tzd, THERMAL_EVENT_UNSPECIFIED);
> + for (idx = 0; idx < data->sensor_count; idx++) {
> + if (!data->tzd_array[idx])
> + continue;
> +
> + thermal_zone_device_update(data->tzd_array[idx], THERMAL_EVENT_UNSPECIFIED);
> + }
>
> mutex_lock(&data->lock);
> clk_enable(data->clk);
> @@ -805,6 +1003,19 @@ static void exynos4210_tmu_clear_irqs(struct exynos_tmu_data *data)
> writel(val_irq, data->base + tmu_intclear);
> }
>
> +static void exynosautov920_tmu_clear_irqs(struct exynos_tmu_data *data)
> +{
> + unsigned int idx, val_irq;
> +
> + for (idx = 0; idx < data->sensor_count; idx++) {
> + if (!data->tzd_array[idx])
> + continue;
> +
> + val_irq = readl(data->base + EXYNOSAUTOV920_TMU_REG_INT_PEND(idx));
> + writel(val_irq, data->base + EXYNOSAUTOV920_TMU_REG_INT_PEND(idx));
> + }
> +}
> +
> static const struct of_device_id exynos_tmu_match[] = {
> {
> .compatible = "samsung,exynos3250-tmu",
> @@ -833,6 +1044,9 @@ static const struct of_device_id exynos_tmu_match[] = {
> }, {
> .compatible = "samsung,exynos7-tmu",
> .data = (const void *)SOC_ARCH_EXYNOS7,
> + }, {
> + .compatible = "samsung,exynosautov920-tmu",
> + .data = (const void *)SOC_ARCH_EXYNOSAUTOV920,
> },
> { },
> };
> @@ -865,6 +1079,10 @@ static int exynos_map_dt_data(struct platform_device *pdev)
>
> data->soc = (uintptr_t)of_device_get_match_data(&pdev->dev);
>
> + data->sensor_count = EXYNOS_DEFAULT_SENSOR_COUNT;
> +
> + data->calib_temp = EXYNOS_SECOND_POINT_TRIM;
> +
> switch (data->soc) {
> case SOC_ARCH_EXYNOS4210:
> data->tmu_set_low_temp = exynos4210_tmu_set_low_temp;
> @@ -945,6 +1163,19 @@ static int exynos_map_dt_data(struct platform_device *pdev)
> data->min_efuse_value = 15;
> data->max_efuse_value = 100;
> break;
> + case SOC_ARCH_EXYNOSAUTOV920:
> + data->tmu_set_low_temp = exynosautov920_tmu_set_low_temp;
> + data->tmu_set_high_temp = exynosautov920_tmu_set_high_temp;
> + data->tmu_disable_low = exynosautov920_tmu_disable_low;
> + data->tmu_disable_high = exynosautov920_tmu_disable_high;
> + data->tmu_set_crit_temp = exynosautov920_tmu_set_crit_temp;
> + data->tmu_initialize = exynosautov920_tmu_initialize;
> + data->tmu_control = exynosautov920_tmu_control;
> + data->tmu_read = exynosautov920_tmu_read;
> + data->tmu_set_emulation = exynos4412_tmu_set_emulation;
> + data->tmu_clear_irqs = exynosautov920_tmu_clear_irqs;
> + data->sensor_count = EXYNOS_MAX_SENSOR_COUNT;
> + break;
> default:
> dev_err(&pdev->dev, "Platform not supported\n");
> return -EINVAL;
> @@ -952,6 +1183,14 @@ static int exynos_map_dt_data(struct platform_device *pdev)
>
> data->cal_type = TYPE_ONE_POINT_TRIMMING;
>
> + if (data->soc == SOC_ARCH_EXYNOSAUTOV920) {
> + if (of_property_read_u32(pdev->dev.of_node, "samsung,sensors",
> + &data->sensor_count)) {
> + dev_err(&pdev->dev, "failed to get sensor count\n");
> + return -ENODEV;
> + }
> + }

Do we really need the `if (data->soc == SOC_ARCH_EXYNOSAUTOV920)`
here, I am sure there will be more socs that use
samsung,sensors. Can't we simply read samsung,sensors for all socs and
use EXYNOS_DEFAULT_SENSOR_COUNT if it fails, or would it be
potentially dangerous if samsung,sensors is missing for autov920 dtb and
default value of 1 is used?

Best regards,
Henrik Grimler

> +
> /*
> * Check if the TMU shares some registers and then try to map the
> * memory of common registers.
> @@ -1006,7 +1245,8 @@ static int exynos_tmu_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> struct exynos_tmu_data *data;
> - int ret;
> + struct thermal_zone_device *tzd;
> + int ret, idx;
>
> data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
> if (!data)
> @@ -1084,11 +1324,19 @@ static int exynos_tmu_probe(struct platform_device *pdev)
> goto err_sclk;
> }
>
> - data->tzd = devm_thermal_of_zone_register(dev, 0, data,
> - &exynos_sensor_ops);
> - if (IS_ERR(data->tzd)) {
> - ret = dev_err_probe(dev, PTR_ERR(data->tzd), "Failed to register sensor\n");
> - goto err_sclk;
> + for (idx = 0; idx < data->sensor_count; idx++) {
> + tzd = devm_thermal_of_zone_register(dev, idx, data, &exynos_sensor_ops);
> +
> + if (IS_ERR(tzd)) {
> + if (PTR_ERR(tzd) == -ENODEV)
> + continue;
> +
> + ret = dev_err_probe(dev, PTR_ERR(data->tzd_array[idx]),
> + "Failed to register sensor\n");
> + goto err_sclk;
> + }
> +
> + data->tzd_array[idx] = tzd;
> }
>
> ret = exynos_thermal_zone_configure(pdev);
> --
> 2.50.1
>