en Copyright 2015 Java http://kernelsources.org:8080/source/history/linux/Documentation/ABI/testing/sysfs-driver-ivpu#7455a0583a906533041a80e48c6a2e3230cce96e accel/ivpu: Add support for limiting NPU frequencyAdd configurable frequency limits to allow users to constrain the NPUoperating frequency range for power and thermal management. This supportrequires firmware API version 3.34.0 or newer.New sysfs interface:The freq/ subdirectory contains the following attributes:- hw_min_freq: Minimum frequency supported by hardware (read-only)- hw_max_freq: Maximum frequency supported by hardware (read-only)- hw_efficient_freq: Hardware's optimal operating frequency (read-only)- current_freq: Current NPU frequency in MHz (read-only)- set_min_freq: Configure minimum operating frequency (50XX+ devices)- set_max_freq: Configure maximum operating frequency (50XX+ devices)Legacy attributes npu_max_frequency_mhz and npu_current_frequency_mhzare maintained for backward compatibility.Implementation details:- Frequency configuration is communicated to firmware via JSM messages- User-specified frequency values are clamped to hardware limits- Power-efficient frequency (pn_ratio) is adjusted dynamically to stay within the configured range- Frequency configuration is initialized during device boot- The JSM API header is updated to version 3.34.0 to support the new VPU_JSM_MSG_FREQ_CONFIG firmware messageAdded description for the sysfs attributes in the Documentation/ABI.Signed-off-by: Andrzej Kacprowski <andrzej.kacprowski@linux.intel.com>Reviewed-by: Karol Wachowski <karol.wachowski@linux.intel.com>Signed-off-by: Karol Wachowski <karol.wachowski@linux.intel.com>Link: https://patch.msgid.link/20260408150152.2093638-1-andrzej.kacprowski@linux.intel.com List of files: /linux/Documentation/ABI/testing/sysfs-driver-ivpu Wed, 08 Apr 2026 17:01:52 +0200 Andrzej Kacprowski <andrzej.kacprowski@linux.intel.com>