xref: /kernel/linux/linux-6.6/Documentation/ABI/testing/sysfs-platform-hidma-mgmt

What:		/sys/devices/platform/hidma-mgmt*/chanops/chan*/priority
		/sys/devices/platform/QCOM8060:*/chanops/chan*/priority
Date:		Nov 2015
KernelVersion:	4.4
Contact:	"Sinan Kaya <okaya@kernel.org>"
Description:
		Contains either 0 or 1 and indicates if the DMA channel is a
		low priority (0) or high priority (1) channel.

What:		/sys/devices/platform/hidma-mgmt*/chanops/chan*/weight
		/sys/devices/platform/QCOM8060:*/chanops/chan*/weight
Date:		Nov 2015
KernelVersion:	4.4
Contact:	"Sinan Kaya <okaya@kernel.org>"
Description:
		Contains 0..15 and indicates the weight of the channel among
		equal priority channels during round robin scheduling.

What:		/sys/devices/platform/hidma-mgmt*/chreset_timeout_cycles
		/sys/devices/platform/QCOM8060:*/chreset_timeout_cycles
Date:		Nov 2015
KernelVersion:	4.4
Contact:	"Sinan Kaya <okaya@kernel.org>"
Description:
		Contains the platform specific cycle value to wait after a
		reset command is issued. If the value is chosen too short,
		then the HW will issue a reset failure interrupt. The value
		is platform specific and should not be changed without
		consultance.

What:		/sys/devices/platform/hidma-mgmt*/dma_channels
		/sys/devices/platform/QCOM8060:*/dma_channels
Date:		Nov 2015
KernelVersion:	4.4
Contact:	"Sinan Kaya <okaya@kernel.org>"
Description:
		Contains the number of dma channels supported by one instance
		of HIDMA hardware. The value may change from chip to chip.

What:		/sys/devices/platform/hidma-mgmt*/hw_version_major
		/sys/devices/platform/QCOM8060:*/hw_version_major
Date:		Nov 2015
KernelVersion:	4.4
Contact:	"Sinan Kaya <okaya@kernel.org>"
Description:
		Version number major for the hardware.

What:		/sys/devices/platform/hidma-mgmt*/hw_version_minor
		/sys/devices/platform/QCOM8060:*/hw_version_minor
Date:		Nov 2015
KernelVersion:	4.4
Contact:	"Sinan Kaya <okaya@kernel.org>"
Description:
		Version number minor for the hardware.

What:		/sys/devices/platform/hidma-mgmt*/max_rd_xactions
		/sys/devices/platform/QCOM8060:*/max_rd_xactions
Date:		Nov 2015
KernelVersion:	4.4
Contact:	"Sinan Kaya <okaya@kernel.org>"
Description:
		Contains a value between 0 and 31. Maximum number of
		read transactions that can be issued back to back.
		Choosing a higher number gives better performance but
		can also cause performance reduction to other peripherals
		sharing the same bus.

What:		/sys/devices/platform/hidma-mgmt*/max_read_request
		/sys/devices/platform/QCOM8060:*/max_read_request
Date:		Nov 2015
KernelVersion:	4.4
Contact:	"Sinan Kaya <okaya@kernel.org>"
Description:
		Size of each read request. The value needs to be a power
		of two and can be between 128 and 1024.

What:		/sys/devices/platform/hidma-mgmt*/max_wr_xactions
		/sys/devices/platform/QCOM8060:*/max_wr_xactions
Date:		Nov 2015
KernelVersion:	4.4
Contact:	"Sinan Kaya <okaya@kernel.org>"
Description:
		Contains a value between 0 and 31. Maximum number of
		write transactions that can be issued back to back.
		Choosing a higher number gives better performance but
		can also cause performance reduction to other peripherals
		sharing the same bus.


What:		/sys/devices/platform/hidma-mgmt*/max_write_request
		/sys/devices/platform/QCOM8060:*/max_write_request
Date:		Nov 2015
KernelVersion:	4.4
Contact:	"Sinan Kaya <okaya@kernel.org>"
Description:
		Size of each write request. The value needs to be a power
		of two and can be between 128 and 1024.