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Commit bdfdf4b2 authored by Phil Edworthy's avatar Phil Edworthy Committed by Wolfram Sang
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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: default avatarPhil Edworthy <phil.edworthy@renesas.com>
Signed-off-by: default avatarGareth Williams <gareth.williams.jx@renesas.com>
Acked-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Reviewed-by: default avatarJarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 9e98c678

Documentation/devicetree/bindings/i2c/i2c-designware.txt

+9 −0
Original line number Diff line number Diff line
@@ -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.