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dt: snps,designware-i2c: Add clock bindings documentation 

The driver requires an undocumented clock property, so detail it.
Add documentation for a separate, optional, interface clock.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: Gareth Williams <gareth.williams.jx@renesas.com>
Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
hifive-unleashed-5.2
Phil Edworthy 2019-02-28 13:52:09 +00:00 committed by Wolfram Sang
parent 9e98c678c2
commit bdfdf4b2ba
1 changed files with 9 additions and 0 deletions
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Documentation/devicetree/bindings/i2c/i2c-designware.txt
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@ -6,12 +6,21 @@ Required properties :
or "mscc,ocelot-i2c" with "snps,designware-i2c" for fallback
- 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 "pclk"
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.
"pclk", the interface clock, required for register access.
- reg : for "mscc,ocelot-i2c", a second register set to configure the SDA hold
time, named ICPU_CFG:TWI_DELAY in the datasheet.