diff mbox

[v7,3/5] i2c: aspeed: added documentation for Aspeed I2C driver

Message ID 20170424181818.2754-4-brendanhiggins@google.com
State Superseded
Headers show

Commit Message

Brendan Higgins April 24, 2017, 6:18 p.m. UTC
Added device tree binding documentation for Aspeed I2C busses.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
---
Changes for v2:
  - None
Changes for v3:
  - Removed reference to "bus" device tree param
Changes for v4:
  - None
Changes for v5:
  - None
Changes for v6:
  - Replaced the controller property with and interrupt controller, leaving only
    the busses in the I2C documentation.
Changes for v7:
  - Changed clock-frequency to bus-frequency in device tree
---
 .../devicetree/bindings/i2c/i2c-aspeed.txt         | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/i2c/i2c-aspeed.txt

Comments

Rob Herring April 28, 2017, 6:21 p.m. UTC | #1
On Mon, Apr 24, 2017 at 11:18:16AM -0700, Brendan Higgins wrote:
> Added device tree binding documentation for Aspeed I2C busses.
> 
> Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
> ---
> Changes for v2:
>   - None
> Changes for v3:
>   - Removed reference to "bus" device tree param
> Changes for v4:
>   - None
> Changes for v5:
>   - None
> Changes for v6:
>   - Replaced the controller property with and interrupt controller, leaving only
>     the busses in the I2C documentation.
> Changes for v7:
>   - Changed clock-frequency to bus-frequency in device tree
> ---
>  .../devicetree/bindings/i2c/i2c-aspeed.txt         | 47 ++++++++++++++++++++++
>  1 file changed, 47 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/i2c/i2c-aspeed.txt

Acked-by: Rob Herring <robh@kernel.org>
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diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt
new file mode 100644
index 000000000000..08ae65251080
--- /dev/null
+++ b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt
@@ -0,0 +1,47 @@ 
+Device tree configuration for the I2C busses on the AST24XX and AST25XX SoCs.
+
+Required Properties:
+- #address-cells	: should be 1
+- #size-cells		: should be 0
+- reg			: address offset and range of bus
+- compatible		: should be "aspeed,ast2400-i2c-bus"
+			  or "aspeed,ast2500-i2c-bus"
+- clocks		: root clock of bus, should reference the APB
+			  clock
+- interrupts		: interrupt number
+- interrupt-parent	: interrupt controller for bus, should reference a
+			  aspeed,ast2400-i2c-ic or aspeed,ast2500-i2c-ic
+			  interrupt controller
+
+Optional Properties:
+- bus-frequency	: frequency of the bus clock in Hz defaults to 100 kHz when not
+		  specified
+
+Example:
+
+i2c {
+	compatible = "simple-bus";
+	#address-cells = <1>;
+	#size-cells = <1>;
+	ranges = <0 0x1e78a000 0x1000>;
+
+	i2c_ic: interrupt-controller@0 {
+		#interrupt-cells = <1>;
+		compatible = "aspeed,ast2400-i2c-ic";
+		reg = <0x0 0x40>;
+		interrupts = <12>;
+		interrupt-controller;
+	};
+
+	i2c0: i2c-bus@40 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		#interrupt-cells = <1>;
+		reg = <0x40 0x40>;
+		compatible = "aspeed,ast2400-i2c-bus";
+		clocks = <&clk_apb>;
+		bus-frequency = <100000>;
+		interrupts = <0>;
+		interrupt-parent = <&i2c_ic>;
+	};
+};