diff options
| author | Phil Edworthy <phil.edworthy@renesas.com> | 2019-02-28 13:52:09 +0000 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2019-03-20 17:56:55 +0100 |
| commit | bdfdf4b2ba644347d63a61da941f30aea1bd35fc (patch) | |
| tree | 5e07a5be87b94f6130031341109c29d8c8bfb3e0 /Documentation/devicetree/bindings/i2c | |
| parent | 9e98c678c2d6ae3a17cb2de55d17f69dddaa231b (diff) | |
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>
Diffstat (limited to 'Documentation/devicetree/bindings/i2c')
| -rw-r--r-- | Documentation/devicetree/bindings/i2c/i2c-designware.txt | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/i2c/i2c-designware.txt b/Documentation/devicetree/bindings/i2c/i2c-designware.txt index 3e4bcc2fb6f7..08be4d3846e5 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-designware.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-designware.txt @@ -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. |