linux-kernel - Re: [PATCH v4 1/7] mfd: ac100: Add device tree bindings for X-Powers AC100 codec/RTC combo IC

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Date:	Fri, 1 Jul 2016 09:40:50 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org, rtc-linux@...glegroups.com,
	linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/7] mfd: ac100: Add device tree bindings for X-Powers
 AC100 codec/RTC combo IC

On Thu, 30 Jun 2016, Chen-Yu Tsai wrote:

> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
> Changes since v3:
> 
>   - Fixed device node names and added labels.
>   - Added clock output from codec and input to rtc.
> 
> Changes since v2:
> 
>   - Fix interrupt line for ac100_codec in provided example.
> 
> ---
>  Documentation/devicetree/bindings/mfd/ac100.txt | 49 +++++++++++++++++++++++++
>  1 file changed, 49 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/ac100.txt
> 
> diff --git a/Documentation/devicetree/bindings/mfd/ac100.txt b/Documentation/devicetree/bindings/mfd/ac100.txt
> new file mode 100644
> index 000000000000..31e6f9cc41bc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/ac100.txt
> @@ -0,0 +1,49 @@
> +X-Powers AC100 Codec/RTC IC device tree bindings

Nit: Device Tree

> +AC100 is a audio codec and RTC subsystem combo IC. The 2 parts are
> +separated, including power supplies and interrupt lines, but share
> +a common register address space and host interface.
> +
> +Required properties:
> +- compatible: "x-powers,ac100"
> +- reg: The I2C slave address or RSB hardware address for the chip
> +- sub-nodes:
> +  - codec
> +    - compatible: "x-powers,ac100-codec"
> +    - interrupt-parent: The parent interrupt controller
> +    - interrupts: SoC NMI / GPIO interrupt connected to the IRQ_AUDIO pin
> +    - #clock-cells: shall be 0

Nit: Shall

> +    - clock-output-names: "4M_adda"
> +    - see clock/clock-bindings.txt for common clock bindings

    - compatible:           "x-powers,ac100-codec"
    - interrupt-parent:	    The parent interrupt controller
    - interrupts: 	    SoC NMI / GPIO interrupt connected to the IRQ_AUDIO pin
    - #clock-cells:   	    shall be 0
    - clock-output-names:   "4M_adda"

    - see clock/clock-bindings.txt for common clock bindings

Don't you think these are easier to read when they're separated?

> +  - rtc
> +    - compatible: "x-powers,ac100-rtc"
> +    - interrupt-parent: The parent interrupt controller
> +    - interrupts: SoC NMI / GPIO interrupt connected to the IRQ_RTC pin
> +    - clocks: A phandle to the codec's "4M_adda" clock
> +    - #clock-cells: shall be 1

Nit: Shall

> +    - clock-output-names: "cko1_rtc", "cko2_rtc", "cko3_rtc"
> +    - see clock/clock-bindings.txt for common clock bindings

Same here.

> +Example:
> +
> +ac100: codec@e89 {
> +	compatible = "x-powers,ac100";
> +	reg = <0xe89>;
> +
> +	ac100_codec: codec {
> +		compatible = "x-powers,ac100-codec";
> +		interrupt-parent = <&r_pio>;
> +		interrupts = <0 9 IRQ_TYPE_LEVEL_LOW>; /* PL9 */
> +		#clock-cells = <0>;
> +		clock-output-names = "4M_adda";
> +	};
> +
> +	ac100_rtc: rtc {
> +		compatible = "x-powers,ac100-rtc";
> +		interrupt-parent = <&nmi_intc>;
> +		interrupts = <0 IRQ_TYPE_LEVEL_LOW>;
> +		clocks = <&ac100_codec>;
> +		#clock-cells = <1>;
> +		clock-output-names = "cko1_rtc", "cko2_rtc", "cko3_rtc";
> +	};
> +};

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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