Re: [PATCH 4/4] iio: pressure: dps310: add Zilltek ZTS8032 support

[Uwe Kleine-König]

On Mon, Oct 12, 2026 at 02:45:50PM +0300, Paulius Zaleckas wrote:
> From: Paulius Zaleckas <paulius.zaleckas@xxxxxxxxx>
> 
> The Zilltek ZTS8032 has the DPS310 register map, scale factors and
> compensation, with these differences:
> 
> - two more pressure coefficients, c31 and c40 at 0x22-0x25, adding
>   c40 * Praw_sc^4 + c31 * Traw_sc * Praw_sc^3 to the polynomial
> - TMP_EXT is MEAS_CFG bit 3, and the temperature coefficients are for
>   the internal sensor (COEF_SRCE reads 0x06). TMP_CFG bit 7 is the top
>   bit of a 4-bit TMP_RATE, so the DPS310 TMP_EXT write would select a
>   25/16 Hz background rate instead of the external sensor.
> - product ID 0x11 instead of 0x10, the driver does not check it
> 
> Add a per-chip table holding the coefficient count and the TMP_CFG
> startup value, and an OF match table to select it.
> 
> Tested on a ZTS8032 at 0x76 over I2C: in_pressure_input is within 1 Pa
> of the datasheet formula evaluated from the raw and coefficient
> registers at every oversampling rate from 1 to 128, and TMP_CFG reads
> 0x00 after probe.
> 
> Assisted-by: LLM
> Signed-off-by: Paulius Zaleckas <paulius.zaleckas@xxxxxxxxx>
> ---
>  drivers/iio/pressure/Kconfig  |  4 +--
>  drivers/iio/pressure/dps310.c | 66 ++++++++++++++++++++++++++++++-----
>  2 files changed, 60 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig
> index cef8b90b9ae7..e407243e131c 100644
> --- a/drivers/iio/pressure/Kconfig
> +++ b/drivers/iio/pressure/Kconfig
> @@ -115,8 +115,8 @@ config DPS310
>  	select IIO_BUFFER
>  	select IIO_TRIGGERED_BUFFER
>  	help
> -	  Support for the Infineon DPS310 digital barometric pressure sensor.
> -	  It can be accessed over I2C bus.
> +	  Support for the Infineon DPS310 and Zilltek ZTS8032 digital
> +	  barometric pressure sensors. They can be accessed over I2C bus.
>  
>  	  This driver can also be built as a module.  If so, the module will be
>  	  called dps310.
> diff --git a/drivers/iio/pressure/dps310.c b/drivers/iio/pressure/dps310.c
> index 3bc690cc8609..3b0f6d344409 100644
> --- a/drivers/iio/pressure/dps310.c
> +++ b/drivers/iio/pressure/dps310.c
> @@ -7,6 +7,10 @@
>   *
>   * https://www.infineon.com/dgdl/?fileId=5546d462576f34750157750826c42242
>   *
> + * The Zilltek ZTS8032 is register compatible, with two more pressure
> + * calibration coefficients (c31, c40) and temperature calibrated against
> + * the internal sensor.
> + *
>   * Temperature calculation:
>   *   c0 * 0.5 + c1 * T_raw / kT °C
>   *
> @@ -18,6 +22,7 @@
>  #include <linux/i2c.h>
>  #include <linux/limits.h>
>  #include <linux/math64.h>
> +#include <linux/mod_devicetable.h>

Adding that header mainly results in pulling in many unneeded
dependencies, so please don't.

of_device_id is already provided by <linux/i2c.h>, so you can just drop
the #include.

>  static const struct acpi_device_id dps310_acpi_match[] = {
> -	{ "IFX3100" },
> +	{ "IFX3100", (kernel_ulong_t)&dps310_chip_info },
>  	{ }
>  };

While touching that struct, please make this:

	{ .id = "IFX3100", .driver_data = (kernel_ulong_t)&dps310_chip_info },

Best regards
Uwe

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