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authorJack Rosenthal <jrosenth@chromium.org>2021-11-04 12:11:58 -0600
committerCommit Bot <commit-bot@chromium.org>2021-11-05 04:22:34 +0000
commit252457d4b21f46889eebad61d4c0a65331919cec (patch)
tree01856c4d31d710b20e85a74c8d7b5836e35c3b98 /extra/i2c_pseudo/README
parent08f5a1e6fc2c9467230444ac9b582dcf4d9f0068 (diff)
downloadchrome-ec-stabilize-14469.41.B-ish.tar.gz
In the interest of making long-term branch maintenance incur as little technical debt on us as possible, we should not maintain any files on the branch we are not actually using. This has the added effect of making it extremely clear when merging CLs from the main branch when changes have the possibility to affect us. The follow-on CL adds a convenience script to actually pull updates from the main branch and generate a CL for the update. BUG=b:204206272 BRANCH=ish TEST=make BOARD=arcada_ish && make BOARD=drallion_ish Signed-off-by: Jack Rosenthal <jrosenth@chromium.org> Change-Id: I17e4694c38219b5a0823e0a3e55a28d1348f4b18 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3262038 Reviewed-by: Jett Rink <jettrink@chromium.org> Reviewed-by: Tom Hughes <tomhughes@chromium.org>
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-This directory contains the i2c-pseudo Linux kernel module.
-
-The i2c-pseudo module was written with the intention of being submitted upstream
-in the Linux kernel. This copy exists because of as 2019-03 this module is not
-yet in the upstream kernel, and even if/when this is included, it may take years
-before making its way to the prepackaged Linux distribution kernels typically
-used by CrOS developers.
-
-See Documentation.txt for more information about the module itself. That file
-is Documentation/i2c/pseudo-controller-interface in the upstream patch.
-
-When servod starts, if the i2c-pseudo module is loaded servod will automatically
-create an I2C pseudo adapter for the Servo I2C bus. That I2C adapter may then
-be used in userspace through i2c-dev (/dev/i2c-<N>). The i2c-tools package
-provides command line utilities for interfacing with i2c-dev devices, and some
-CrOS software can work directly with i2c-dev devices as well, such as iteflash
-which is used by flash_ec when reflashing an ITE EC through a Servo.
-
-Automated installation:
-$ ./install