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Subject[PATCH] devices.txt: improve entry for comedi (char major 98)
Date
Describe how the comedi minor device numbers are split across comedi
devices and comedi subdevices.

Replace the current, long dead URL with an official URL for the Comedi
project.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
---
Documentation/admin-guide/devices.txt | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/Documentation/admin-guide/devices.txt b/Documentation/admin-guide/devices.txt
index e56e00655153..1c5d2281efc9 100644
--- a/Documentation/admin-guide/devices.txt
+++ b/Documentation/admin-guide/devices.txt
@@ -1647,8 +1647,17 @@
0 = /dev/comedi0 First comedi device
1 = /dev/comedi1 Second comedi device
...
+ 47 = /dev/comedi47 48th comedi device

- See http://stm.lbl.gov/comedi.
+ Minors 48 to 255 are reserved for comedi subdevices with
+ pathnames of the form "/dev/comediX_subdY", where "X" is the
+ minor number of the associated comedi device and "Y" is the
+ subdevice number. These subdevice minors are assigned
+ dynamically, so there is no fixed mapping from subdevice
+ pathnames to minor numbers.
+
+ See http://www.comedi.org/ for information about the Comedi
+ project.

98 block User-mode virtual block device
0 = /dev/ubda First user-mode block device
--
2.23.0
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