i2c: document generic DT bindings for timing parameters

[cascardo/linux.git] / Documentation / devicetree / bindings / i2c / i2c.txt

diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt
index 8a99150..a00219f 100644 (file)
--- 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.
 
 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
 
 Binding may contain optional "interrupts" property, describing interrupts
 used by the device. I2C core will assign "irq" interrupt (or the very first