linux-kernel - Re: [PATCH v6 3/5] i2c: aspeed: added documentation for Aspeed I2C driver

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Date:   Mon, 3 Apr 2017 09:24:10 -0500
From:   Rob Herring <robh@...nel.org>
To:     Brendan Higgins <brendanhiggins@...gle.com>
Cc:     wsa@...-dreams.de, mark.rutland@....com, tglx@...utronix.de,
        jason@...edaemon.net, marc.zyngier@....com, joel@....id.au,
        vz@...ia.com, mouse@...c.ru, clg@...d.org,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, openbmc@...ts.ozlabs.org,
        benh@...nel.crashing.org
Subject: Re: [PATCH v6 3/5] i2c: aspeed: added documentation for Aspeed I2C
 driver

On Mon, Mar 27, 2017 at 10:12:24PM -0700, Brendan Higgins wrote:
> Added device tree binding documentation for Aspeed I2C busses.
> 
> Signed-off-by: Brendan Higgins <brendanhiggins@...gle.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.
> ---
>  .../devicetree/bindings/i2c/i2c-aspeed.txt         | 49 ++++++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/i2c/i2c-aspeed.txt
> 
> diff --git a/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt
> new file mode 100644
> index 000000000000..fbcc501706b1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/i2c-aspeed.txt
> @@ -0,0 +1,49 @@
> +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:
> +- clock-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";
> +		bus = <0>;

Not documented and what's it for?

> +		clocks = <&clk_apb>;
> +		clock-frequency = <100000>;
> +		status = "disabled";

Drop status from examples.

> +		interrupts = <0>;
> +		interrupt-parent = <&i2c_ic>;
> +	};
> +};
> -- 
> 2.12.2.564.g063fe858b8-goog
>