linux-kernel - Re: [PATCH v2] clk: add device tree fixed-factor-clock binding support

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Date:	Fri, 12 Apr 2013 12:30:10 +0200
From:	Christian Ruppert <christian.ruppert@...lis.com>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	Mike Turquette <mturquette@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	devicetree-discuss@...ts.ozlabs.or,
	Shawn Guo <shawn.guo@...escale.com>
Subject: Re: [PATCH v2] clk: add device tree fixed-factor-clock binding
 support

Hi Gregory,

Just tested the patch and it works perfectly. Did you forget to update
Documentation/devicetree/bindings/clock/fixed-factor-clock.txt, however?

Greetings,
  Christian

On Fri, Apr 12, 2013 at 11:58:28AM +0200, Gregory CLEMENT wrote:
> Add support for DT "fixed-factor-clock" binding to the common fixed
> factor clock support.
> 
> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> ---
>  .../bindings/clock/fixed-factor-clock.txt          |   24 +++++++++++++
>  drivers/clk/clk-fixed-factor.c                     |   36 ++++++++++++++++++++
>  include/linux/clk-provider.h                       |    2 ++
>  3 files changed, 62 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/clock/fixed-factor-clock.txt
> 
> diff --git a/Documentation/devicetree/bindings/clock/fixed-factor-clock.txt b/Documentation/devicetree/bindings/clock/fixed-factor-clock.txt
> new file mode 100644
> index 0000000..7ed236f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/clock/fixed-factor-clock.txt
> @@ -0,0 +1,24 @@
> +Binding for simple fixed factor rate clock sources.
> +
> +This binding uses the common clock binding[1].
> +
> +[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
> +
> +Required properties:
> +- compatible : shall be "fixed-factor-clock".
> +- #clock-cells : from common clock binding; shall be set to 0.
> +- div: fixed divider.
> +- mult: fixed multiplier.
> +- clocks: parent clock.
> +
> +Optional properties:
> +- clock-output-names : From common clock binding.
> +
> +Example:
> +	clock {
> +		compatible = "fixed-factor-clock";
> +		clocks = <&parentclk>;
> +		#clock-cells = <0>;
> +		div = <2>;
> +		mult = <1>;
> +	};
> diff --git a/drivers/clk/clk-fixed-factor.c b/drivers/clk/clk-fixed-factor.c
> index 1ef271e..9ff7d51 100644
> --- a/drivers/clk/clk-fixed-factor.c
> +++ b/drivers/clk/clk-fixed-factor.c
> @@ -11,6 +11,7 @@
>  #include <linux/clk-provider.h>
>  #include <linux/slab.h>
>  #include <linux/err.h>
> +#include <linux/of.h>
>  
>  /*
>   * DOC: basic fixed multiplier and divider clock that cannot gate
> @@ -96,3 +97,38 @@ struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
>  
>  	return clk;
>  }
> +#ifdef CONFIG_OF
> +/**
> + * of_fixed_factor_clk_setup() - Setup function for simple fixed factor clock
> + */
> +void __init of_fixed_factor_clk_setup(struct device_node *node)
> +{
> +	struct clk *clk;
> +	const char *clk_name = node->name;
> +	const char *parent_name;
> +	u32 div, mult;
> +
> +	if (of_property_read_u32(node, "clock-div", &div)) {
> +		pr_err("%s Fixed factor clock <%s> must have a clock-div property\n",
> +			__func__, node->name);
> +		return;
> +	}
> +
> +	if (of_property_read_u32(node, "clock-mult", &mult)) {
> +		pr_err("%s Fixed factor clock <%s> must have a clokc-mult property\n",
> +			__func__, node->name);
> +		return;
> +	}
> +
> +	of_property_read_string(node, "clock-output-names", &clk_name);
> +	parent_name = of_clk_get_parent_name(node, 0);
> +
> +	clk = clk_register_fixed_factor(NULL, clk_name, parent_name, 0,
> +					mult, div);
> +	if (!IS_ERR(clk))
> +		of_clk_add_provider(node, of_clk_src_simple_get, clk);
> +}
> +EXPORT_SYMBOL_GPL(of_fixed_factor_clk_setup);
> +CLK_OF_DECLARE(fixed_factor_clk, "fixed-factor-clock",
> +		of_fixed_factor_clk_setup);
> +#endif
> diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
> index 7f197d7..7ea501b 100644
> --- a/include/linux/clk-provider.h
> +++ b/include/linux/clk-provider.h
> @@ -325,6 +325,8 @@ struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
>  		const char *parent_name, unsigned long flags,
>  		unsigned int mult, unsigned int div);
>  
> +void of_fixed_factor_clk_setup(struct device_node *node);
> +
>  /**
>   * clk_register - allocate a new clock, register it and return an opaque cookie
>   * @dev: device that is registering this clock
> -- 
> 1.7.9.5
> 

-- 
  Christian Ruppert              ,          <christian.ruppert@...lis.com>
                                /|
  Tel: +41/(0)22 816 19-42     //|                 3, Chemin du Pré-Fleuri
                             _// | bilis Systems   CH-1228 Plan-les-Ouates
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