linux-kernel - Re: [PATCH 1/2] dt-bindings: clock: add description of 74aup1g157gw

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Message-ID: <20181017160556.GA14935@bogus>
Date:   Wed, 17 Oct 2018 11:05:56 -0500
From:   Rob Herring <robh@...nel.org>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: clock: add description of 74aup1g157gw

On Wed, Oct 10, 2018 at 02:16:35AM +0000, Kuninori Morimoto wrote:
> 
> From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
> 
> 74aup1g157gw needs i0 and i1 pin as input, select and output it by
> sel gpio pin. This patch adds description for 74aup1g157gw as clock
> multiplexer.
> "nxp,74aup1g157gw-clk" will select most closest input as output,
> "nxp,74aup1g157gw-audio-clk" will select 48kHz/44.1kHz categorized
> input as output.
> 
> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
> ---
>  .../devicetree/bindings/clock/nxp,74aup1g157gw.txt    | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/nxp,74aup1g157gw.txt
> 
> diff --git a/Documentation/devicetree/bindings/clock/nxp,74aup1g157gw.txt b/Documentation/devicetree/bindings/clock/nxp,74aup1g157gw.txt
> new file mode 100644
> index 0000000..d07bc04
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/nxp,74aup1g157gw.txt
> @@ -0,0 +1,19 @@
> +NXP 74AUP1G157GW Low-power 2-input multiplexer for clock
> +
> +Required properties:
> +- compatible:	"nxp,74aup1g157gw-clk"      (select closest input as output)
> +		"nxp,74aup1g157gw-audio-clk (select 48kHz / 44.1kHz as output)

I don't understand why you need the second one.


What's wrong with the existing gpio-mux-clock binding?

> +- clocks:	select input clock as i0, i1
> +- clock-names:	"i0" and "i1"
> +- sel-gpios:	selector pin
> +
> +Examples:
> +
> +	clk {
> +		#clock-cells = <0>;
> +		compatible = "nxp,74aup1g157gw-audio-clk";
> +		clocks = <&clk8snd>, <&clksnd>;
> +		clock-names = "i0", "i1";
> +		sel-gpios = <&gpio_exp_75 13 GPIO_ACTIVE_HIGH>;
> +	};
> +
> -- 
> 2.7.4
>