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