The driver requires an undocumented clock property, so detail it.
Add documentation for a separate bus clock.
Signed-off-by: Phil Edworthy <phil.edworthy@xxxxxxxxxxx>
---
Documentation/devicetree/bindings/i2c/i2c-designware.txt | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/i2c/i2c-designware.txt b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
index fbb0a6d..e9f4387 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-designware.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-designware.txt
@@ -1,16 +1,21 @@
* Synopsys DesignWare I2C
Required properties :
-
- compatible : should be "snps,designware-i2c"
- reg : Offset and length of the register set for the device
- interrupts : <IRQ> where IRQ is the interrupt number.
+ - clocks : phandles for the clocks, see the description of clock-names below.
+ The phandle for the "ic_clk" clock is required. The phandle for the "bus"
+ clock is optional. If a single clock is specified but no clock-name, it is
+ the "ic_clk" clock. If both clocks are listed, the "ic_clk" must be first.
Recommended properties :
-
- clock-frequency : desired I2C bus clock frequency in Hz.
Optional properties :
+ - clock-names : Contains the names of the clocks:
+ "ic_clk", for the core clock used to generate the external I2C clock.
+ "bus", the bus clock, sometimes described as pclk, for register accesses.
- 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.
--
2.7.4
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