leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

docs: i2c: summary: extend introduction

Browse Source 
- state the "official" name (I²C, not I2C, according to the spec) at
   the beginning but keep using the more practical I2C elsewhere
 - mention some known different names
 - add link to the specification document

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Luca Ceresoli 2020-01-29 16:19:27 +01:00 committed by Wolfram Sang
parent 2159393808
commit 096c22f88e
1 changed files with 12 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
Documentation/i2c/summary.rst
View File

@ -2,12 +2,18 @@
I2C and SMBus
=============
I2C (pronounce: I squared C) is a protocol developed by Philips. It is a
slow two-wire protocol (variable speed, up to 400 kHz), with a high speed
extension (3.4 MHz). It provides an inexpensive bus for connecting many
types of devices with infrequent or low bandwidth communications needs.
I2C is widely used with embedded systems. Some systems use variants that
don't meet branding requirements, and so are not advertised as being I2C.
I²C (pronounce: I squared C and written I2C in the kernel documentation) is
a protocol developed by Philips. It is a slow two-wire protocol (variable
speed, up to 400 kHz), with a high speed extension (3.4 MHz). It provides
an inexpensive bus for connecting many types of devices with infrequent or
low bandwidth communications needs. I2C is widely used with embedded
systems. Some systems use variants that don't meet branding requirements,
and so are not advertised as being I2C but come under different names,
e.g. TWI (Two Wire Interface), IIC.
The official I2C specification is the `"I2C-bus specification and user
manual" (UM10204) <https://www.nxp.com/docs/en/user-guide/UM10204.pdf>`_
published by NXP Semiconductors.
SMBus (System Management Bus) is based on the I2C protocol, and is mostly
a subset of I2C protocols and signaling. Many I2C devices will work on an