linux-kernel - Re: [PATCH v3 04/14] clk: max77686: Improve Maxim 77686 PMIC clocks binding

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Date:	Wed, 25 Jun 2014 12:19:11 +0200
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Lee Jones <lee.jones@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Mark Brown <broonie@...nel.org>,
	Mike Turquette <mturquette@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Doug Anderson <dianders@...omium.org>,
	Olof Johansson <olof@...om.net>,
	Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
	Daniel Stone <daniels@...labora.com>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 04/14] clk: max77686: Improve Maxim 77686 PMIC clocks
 binding

On czw, 2014-06-19 at 20:20 +0200, Javier Martinez Canillas wrote:
> Like most clock drivers, the Maxim 77686 PMIC clock binding
> follows the convention that the "#clock-cells" property is
> used to specify the number of cells in a clock provider.
> 
> But the binding document is not clear enough that it shall
> be set to 1 since the PMIC support multiple clocks outputs.
> 
> Also, explain that the clocks identifiers are defined in a
> header file that can be included by Device Tree source with
> client nodes to avoid using magic numbers.
> 
> Signed-off-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
> ---
>  .../devicetree/bindings/clock/maxim,max77686.txt          | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)

Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>

Best regards,
Krzysztof


> diff --git a/Documentation/devicetree/bindings/clock/maxim,max77686.txt b/Documentation/devicetree/bindings/clock/maxim,max77686.txt
> index 96ce71b..8dea305 100644
> --- a/Documentation/devicetree/bindings/clock/maxim,max77686.txt
> +++ b/Documentation/devicetree/bindings/clock/maxim,max77686.txt
> @@ -9,13 +9,18 @@ The MAX77686 contains three 32.768khz clock outputs that can be controlled
>  Following properties should be presend in main device node of the MFD chip.
>  
>  Required properties:
> -- #clock-cells: simple one-cell clock specifier format is used, where the
> -  only cell is used as an index of the clock inside the provider. Following
> -  indices are allowed:
> +
> +- #clock-cells: from common clock binding; shall be set to 1.
> +
> +Each clock is assigned an identifier and client nodes can use this identifier
> +to specify the clock which they consume. Following indices are allowed:
>      - 0: 32khz_ap clock,
>      - 1: 32khz_cp clock,
>      - 2: 32khz_pmic clock.
>  
> +Clocks are defined as preprocessor macros in dt-bindings/clock/maxim,max77686.h
> +header and can be used in device tree sources.
> +
>  Example: Node of the MFD chip
>  
>  	max77686: max77686@09 {
> @@ -33,6 +38,6 @@ Example: Clock consumer node
>  	foo@0 {
>  		compatible = "bar,foo";
>  		/* ... */
> -		clock-names = "my-clock";
> -		clocks = <&max77686 2>;
> +		clock-names = "32khz_pmic";
> +		clocks = <&max77686 MAX77686_CLK_PMIC>;
>  	};

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