From 05bd07280d5f70920c3619998b3a79742e4cde30 Mon Sep 17 00:00:00 2001 From: Wolfram Sang <wsa+renesas@sang-engineering.com> Date: Mon, 21 Jan 2019 15:16:57 +0100 Subject: i2c: gpio: fault-injector: better SPHINX style in docs We don't use SPHINX currently in I2C documentation; but preparing the I2C fault injector docs already is a good idea since it makes it easier to read. Especially as new stuff is going to be added soon. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> --- Documentation/i2c/gpio-fault-injection | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) (limited to 'Documentation/i2c') diff --git a/Documentation/i2c/gpio-fault-injection b/Documentation/i2c/gpio-fault-injection index a4ce62090fd5..1a44e3edc0c4 100644 --- a/Documentation/i2c/gpio-fault-injection +++ b/Documentation/i2c/gpio-fault-injection @@ -1,3 +1,4 @@ +========================= Linux I2C fault injection ========================= @@ -13,6 +14,9 @@ mounted at /sys/kernel/debug. There will be a separate subdirectory per GPIO driven I2C bus. Each subdirectory will contain files to trigger the fault injection. They will be described now along with their intended use-cases. +Wire states +=========== + "scl" ----- @@ -34,10 +38,10 @@ I2C specification version 4, section 3.1.16) using the helpers of the Linux I2C core (see 'struct bus_recovery_info'). However, the bus recovery will not succeed because SDA is still pinned low until you manually release it again with "echo 1 > sda". A test with an automatic release can be done with the -following class of fault injectors. +"incomplete transfers" class of fault injectors. -Introduction to incomplete transfers ------------------------------------- +Incomplete transfers +==================== The following fault injectors create situations where SDA will be held low by a device. Bus recovery should be able to fix these situations. But please note: -- cgit v1.2.3