1 What: /sys/bus/platform/devices/.../driver_override 2 Date: April 2014 3 Contact: Kim Phillips <kim.phillips@freescale.com> 4 Description: 5 This file allows the driver for a device to be specified which 6 will override standard OF, ACPI, ID table, and name matching. 7 When specified, only a driver with a name matching the value 8 written to driver_override will have an opportunity to bind 9 to the device. The override is specified by writing a string 10 to the driver_override file (echo vfio-platform > \ 11 driver_override) and may be cleared with an empty string 12 (echo > driver_override). This returns the device to standard 13 matching rules binding. Writing to driver_override does not 14 automatically unbind the device from its current driver or make 15 any attempt to automatically load the specified driver. If no 16 driver with a matching name is currently loaded in the kernel, 17 the device will not bind to any driver. This also allows 18 devices to opt-out of driver binding using a driver_override 19 name such as "none". Only a single driver may be specified in 20 the override, there is no support for parsing delimiters. 21 22 What: /sys/bus/platform/devices/.../numa_node 23 Date: June 2020 24 Contact: Barry Song <song.bao.hua@hisilicon.com> 25 Description: 26 This file contains the NUMA node to which the platform device 27 is attached. It won't be visible if the node is unknown. The 28 value comes from an ACPI _PXM method or a similar firmware 29 source. Initial users for this file would be devices like 30 arm smmu which are populated by arm64 acpi_iort. 31 32 What: /sys/bus/platform/devices/.../msi_irqs/ 33 Date: August 2021 34 Contact: Barry Song <song.bao.hua@hisilicon.com> 35 Description: 36 The /sys/devices/.../msi_irqs directory contains a variable set 37 of files, with each file being named after a corresponding msi 38 irq vector allocated to that device. 39 40 What: /sys/bus/platform/devices/.../msi_irqs/<N> 41 Date: August 2021 42 Contact: Barry Song <song.bao.hua@hisilicon.com> 43 Description: 44 This attribute will show "msi" if <N> is a valid msi irq 45 46 What: /sys/bus/platform/devices/.../modalias 47 Description: 48 Same as MODALIAS in the uevent at device creation. 49 50 A platform device that it is exposed via devicetree uses: 51 52 - of:N`of node name`T`type` 53 54 Other platform devices use, instead: 55 56 - platform:`driver name` 57