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@xxxxxxxxxxxxxxx>
> ---
> .../devicetree/bindings/clock/maxim,max77686.txt | 15 ++++++++++-----
> 1 file changed, 10 insertions(+), 5 deletions(-)
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
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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