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authorWolfram Sang <wsa+renesas@sang-engineering.com>2015-12-08 10:37:45 +0100
committerWolfram Sang <wsa@the-dreams.de>2015-12-14 10:39:01 +0100
commit99b809d7bdd17de7a68f1625a8973052c8311657 (patch)
treee2048c0ea9099daad6a2342c9e30670fafe69bc4 /Documentation/devicetree/bindings/i2c
parentc31d0a00021d7289c01edc3d9670da52132d0457 (diff)
i2c: document generic DT bindings for timing parameters
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>
Diffstat (limited to 'Documentation/devicetree/bindings/i2c')
-rw-r--r--Documentation/devicetree/bindings/i2c/i2c.txt31
1 files changed, 26 insertions, 5 deletions
diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt
index 8a99150ac3a7..a00219f5ee07 100644
--- a/Documentation/devicetree/bindings/i2c/i2c.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c.txt
@@ -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