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i2c: document generic DT bindings for timing parameters

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Also, sort the properties alphabetically and make indentation
consistent. Wording largely taken from i2c-rk3x.txt, thanks guys!

Only "i2c-scl-internal-delay-ns" is new, the rest is used by two drivers
already and was documented in their driver binding documentation.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2015-12-08 10:37:45 +01:00 committed by Wolfram Sang
parent c31d0a0002
commit 99b809d7bd
1 changed files with 26 additions and 5 deletions
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31
Documentation/devicetree/bindings/i2c/i2c.txt
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@ -29,12 +29,33 @@ Optional properties
These properties may not be supported by all drivers. However, if a driver
wants to support one of the below features, it should adapt the bindings below.
- clock-frequency - frequency of bus clock in Hz.
- wakeup-source - device can be used as a wakeup source.
- clock-frequency
frequency of bus clock in Hz.
- interrupts - interrupts used by the device.
- interrupt-names - "irq" and "wakeup" names are recognized by I2C core,
other names are left to individual drivers.
- i2c-scl-falling-time-ns
Number of nanoseconds the SCL signal takes to fall; t(f) in the I2C
specification.
- i2c-scl-internal-delay-ns
Number of nanoseconds the IP core additionally needs to setup SCL.
- i2c-scl-rising-time-ns
Number of nanoseconds the SCL signal takes to rise; t(r) in the I2C
specification.
- i2c-sda-falling-time-ns
Number of nanoseconds the SDA signal takes to fall; t(f) in the I2C
specification.
- interrupts
interrupts used by the device.
- interrupt-names
"irq" and "wakeup" names are recognized by I2C core, other names are
left to individual drivers.
- wakeup-source
device can be used as a wakeup source.
Binding may contain optional "interrupts" property, describing interrupts
used by the device. I2C core will assign "irq" interrupt (or the very first