[PATCH v8 2/5] thermal: samsung: Add Exynos ACPM TMU driver GS101

[André Draszik]

On Wed, 2026-06-03 at 13:00 +0000, Tudor Ambarus wrote:
> Add driver for the Thermal Management Unit (TMU) managed via the Alive
> Clock and Power Manager (ACPM), found on Samsung Exynos SoCs such as
> the Google GS101.
> 
> The TMU on the GS101 utilizes a hybrid management model shared between
> the Application Processor (AP) and the ACPM firmware. The driver
> maintains direct memory-mapped access to the TMU interrupt pending
> registers to identify thermal events, while delegating functional
> tasks - such as sensor initialization, threshold configuration, and
> temperature acquisition, to the ACPM firmware via the ACPM IPC
> protocol.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus at linaro.org>
> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski at oss.qualcomm.com>
> ---
>  drivers/thermal/samsung/Kconfig    |  19 ++
>  drivers/thermal/samsung/Makefile   |   2 +
>  drivers/thermal/samsung/acpm-tmu.c | 651 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 672 insertions(+)
> 
> diff --git a/drivers/thermal/samsung/Kconfig b/drivers/thermal/samsung/Kconfig
> index f4eff5a41a84..bf9fb52e848e 100644
> --- a/drivers/thermal/samsung/Kconfig
> +++ b/drivers/thermal/samsung/Kconfig
> @@ -9,3 +9,22 @@ config EXYNOS_THERMAL
>  	  the TMU, reports temperature and handles cooling action if defined.
>  	  This driver uses the Exynos core thermal APIs and TMU configuration
>  	  data from the supported SoCs.
> +
> +config EXYNOS_ACPM_THERMAL
> +	tristate "Exynos ACPM thermal management unit driver"
> +	depends on THERMAL_OF
> +	depends on HAS_IOMEM
> +	depends on EXYNOS_ACPM_PROTOCOL
> +	default ARCH_EXYNOS
> +	help
> +	  Support for the Thermal Management Unit (TMU) on Samsung Exynos SoCs
> +	  utilizing the ACPM IPC protocol, such as the Google GS101.
> +
> +	  The TMU on these platforms is managed through a hybrid architecture.
> +	  This driver handles direct register access for thermal interrupt status
> +	  monitoring and communicates with the Alive Clock and Power Manager
> +	  (ACPM) firmware via the ACPM IPC protocol for functional sensor control
> +	  and configuration.
> +
> +	  Select this if you want to monitor device temperature and enable
> +	  thermal mitigation on Samsung Exynos ACPM based devices.

If you're sending a new version, it might make sense to add a brief
clarification to the existing CONFIG_EXYNOS_THERMAL in that it only
supports (the older?) non-ACPM designs.

In any case:
Reviewed-by: André Draszik <andre.draszik at linaro.org>