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dt-bindings: i2c: designware: document MSCC Ocelot bindings

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Document bindings for the Microsemi Ocelot integration of the Designware
I2C controller.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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Alexandre Belloni 2018-08-31 17:11:11 +02:00 • committed by Wolfram Sang
parent c7fa7aeff8
commit ffbc01bff2
1 changed files with 6 additions and 1 deletions
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7
Documentation/devicetree/bindings/i2c/i2c-designware.txt
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@ -3,6 +3,7 @@
Required properties : Required properties :
- compatible : should be "snps,designware-i2c" - compatible : should be "snps,designware-i2c"
or "mscc,ocelot-i2c" with "snps,designware-i2c" for fallback
- reg : Offset and length of the register set for the device - reg : Offset and length of the register set for the device
- interrupts : <IRQ> where IRQ is the interrupt number. - interrupts : <IRQ> where IRQ is the interrupt number.
@ -11,8 +12,12 @@ Recommended properties :
- clock-frequency : desired I2C bus clock frequency in Hz. - clock-frequency : desired I2C bus clock frequency in Hz.
Optional properties : Optional properties :
- reg : for "mscc,ocelot-i2c", a second register set to configure the SDA hold
time, named ICPU_CFG:TWI_DELAY in the datasheet.
- i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds. - i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds.
This option is only supported in hardware blocks version 1.11a or newer. This option is only supported in hardware blocks version 1.11a or newer and
on Microsemi SoCs ("mscc,ocelot-i2c" compatible).
- i2c-scl-falling-time-ns : should contain the SCL falling time in nanoseconds. - i2c-scl-falling-time-ns : should contain the SCL falling time in nanoseconds.
This value which is by default 300ns is used to compute the tLOW period. This value which is by default 300ns is used to compute the tLOW period.