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| author | Heiko Schocher <hs@denx.de> | 2020-03-16 09:55:06 +0300 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2020-03-16 09:55:06 +0300 |
| commit | ba6fb2f6aca54c6555742d507290cbfaa655e623 (patch) | |
| tree | aed4a6fccbf47832226a0991a657683c779e1698 /doc | |
| parent | 7383edc2fbd56573819f9ca7401105366191b715 (diff) | |
| download | u-boot-ba6fb2f6aca54c6555742d507290cbfaa655e623.tar.xz | |
dm: i2c-gpio: add support for clock stretching
This adds support for clock stretching to the i2c-gpio driver. This is
accomplished by switching the GPIO used for the SCL line to an input
when it should be driven high, and polling on the SCL line value until
it goes high (indicating that the I2C slave is no longer pulling it
low).
This is enabled by default; for gpios which cannot be configured as
inputs, the i2c-gpio,scl-output-only property can be used to fall back
to the previous behavior.
Signed-off-by: Michael Auchter <michael.auchter@ni.com>
Cc: Heiko Schocher <hs@denx.de>
Reviewed-by: Heiko Schocher <hs@denx.de>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/device-tree-bindings/i2c/i2c-gpio.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/i2c/i2c-gpio.txt b/doc/device-tree-bindings/i2c/i2c-gpio.txt index e29eeba9e6..b06b829933 100644 --- a/doc/device-tree-bindings/i2c/i2c-gpio.txt +++ b/doc/device-tree-bindings/i2c/i2c-gpio.txt @@ -18,6 +18,8 @@ Optional: It not defined, then default is 5us (~50KHz). * i2c-gpio,deblock Run deblocking sequence when the driver gets probed. +* i2c-gpio,scl-output-only; + Set if SCL is an output only Example: |