linux-kernel - Re: [PATCH v5 04/14] clk: max77686: Improve Maxim 77686 PMIC clocks binding

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Date:	Tue, 01 Jul 2014 10:29:59 -0700
From:	Mike Turquette <mturquette@...aro.org>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	"Lee Jones" <lee.jones@...aro.org>
Cc:	"Samuel Ortiz" <sameo@...ux.intel.com>,
	"Mark Brown" <broonie@...nel.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>,
	"Krzysztof Kozlowski" <k.kozlowski@...sung.com>,
	"Yadwinder Singh Brar" <yadi.brar01@...il.com>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Javier Martinez Canillas" <javier.martinez@...labora.co.uk>
Subject: Re: [PATCH v5 04/14] clk: max77686: Improve Maxim 77686 PMIC clocks binding

Quoting Javier Martinez Canillas (2014-06-26 11:15:36)
> 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>
> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Reviewed-by: Doug Anderson <dianders@...omium.org>

Looks good to me.

Regards,
Mike

> ---
> 
> Changes since v4: None
> 
> Changes since v3:
>  - Don't change clock-names property to make clear that it's
>    the consumer clock name and should not match the producer clock.
>    Suggested by Doug Anderson.
> 
>  Documentation/devicetree/bindings/clock/maxim,max77686.txt | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/clock/maxim,max77686.txt b/Documentation/devicetree/bindings/clock/maxim,max77686.txt
> index 96ce71b..48e00bb 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 {
> @@ -34,5 +39,5 @@ Example: Clock consumer node
>                 compatible = "bar,foo";
>                 /* ... */
>                 clock-names = "my-clock";
> -               clocks = <&max77686 2>;
> +               clocks = <&max77686 MAX77686_CLK_PMIC>;
>         };
> -- 
> 2.0.0.rc2
> 
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