linux-kernel - Re: [PATCH] clk: Use a separate struct for holding init data.

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Date:	Wed, 2 May 2012 11:58:16 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Saravana Kannan <skannan@...eaurora.org>
Cc:	Mike Turquette <mturquette@...aro.org>,
	Arnd Bergman <arnd.bergmann@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, Andrew Lunn <andrew@...n.ch>,
	Paul Walmsley <paul@...an.com>,
	Russell King <linux@....linux.org.uk>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	linux-arm-msm@...r.kernel.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Magnus Damm <magnus.damm@...il.com>,
	linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Richard Zhao <richard.zhao@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Deepak Saxena <dsaxena@...aro.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Jamie Iles <jamie@...ieiles.com>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Shawn Guo <shawn.guo@...escale.com>
Subject: Re: [PATCH] clk: Use a separate struct for holding init data.

On Wed, Apr 25, 2012 at 10:58:56PM -0700, Saravana Kannan wrote:
> Create a struct clk_init_data to hold all data that needs to be passed from
> the platfrom specific driver to the common clock framework during clock
> registration. Add a pointer to this struct inside clk_hw.
> 
> This has several advantages:
> * Completely hides struct clk from many clock platform drivers and static
>   clock initialization code that don't care for static initialization of
>   the struct clks.
> * For platforms that want to do complete static initialization, it removed
>   the need to directly mess with the struct clk's fields while still
>   allowing to statically allocate struct clk. This keeps the code more
>   future proof even if they include clk-private.h.
> * Simplifies the generic clk_register() function and allows adding optional
>   fields in the future without modifying the function signature.
> * Simplifies the static initialization of clocks on all platforms by
>   removing the need for forward delcarations or convoluted macros.
> 
> Signed-off-by: Saravana Kannan <skannan@...eaurora.org>
> Cc: Mike Turquette <mturquette@...aro.org>
> Cc: Andrew Lunn <andrew@...n.ch>
> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Jeremy Kerr <jeremy.kerr@...onical.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Arnd Bergman <arnd.bergmann@...aro.org>
> Cc: Paul Walmsley <paul@...an.com>
> Cc: Shawn Guo <shawn.guo@...escale.com>
> Cc: Sascha Hauer <s.hauer@...gutronix.de>
> Cc: Jamie Iles <jamie@...ieiles.com>
> Cc: Richard Zhao <richard.zhao@...aro.org>
> Cc: Saravana Kannan <skannan@...eaurora.org>
> Cc: Magnus Damm <magnus.damm@...il.com>
> Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> Cc: Linus Walleij <linus.walleij@...ricsson.com>
> Cc: Stephen Boyd <sboyd@...eaurora.org>
> Cc: Amit Kucheria <amit.kucheria@...aro.org>
> Cc: Deepak Saxena <dsaxena@...aro.org>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> ---
>  drivers/clk/clk-divider.c    |   14 +++--
>  drivers/clk/clk-fixed-rate.c |   14 +++--
>  drivers/clk/clk-gate.c       |   15 +++--
>  drivers/clk/clk-mux.c        |   10 +++-
>  drivers/clk/clk.c            |   91 +++++++++++++++++++------------
>  include/linux/clk-private.h  |  121 +-----------------------------------------
>  include/linux/clk-provider.h |   59 +++++++++++++-------
>  7 files changed, 129 insertions(+), 195 deletions(-)
> 
> diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
> index 6e58f11..8e97491 100644
> --- a/drivers/clk/clk-mux.c
> +++ b/drivers/clk/clk-mux.c
> @@ -95,6 +95,7 @@ struct clk *clk_register_mux(struct device *dev, const char *name,
>  {
>  	struct clk_mux *mux;
>  	struct clk *clk;
> +	struct clk_init_data init;
>  
>  	/* allocate the mux */
>  	mux = kzalloc(sizeof(struct clk_mux), GFP_KERNEL);
> @@ -103,6 +104,12 @@ struct clk *clk_register_mux(struct device *dev, const char *name,
>  		return ERR_PTR(-ENOMEM);
>  	}
>  
> +	init.name = name;
> +	init.ops = &clk_mux_ops;
> +	init.flags = flags;
> +	init.parent_names = parent_names;
> +	init.num_parents = num_parents;
> +
>  	/* struct clk_mux assignments */
>  	mux->reg = reg;
>  	mux->shift = shift;
> @@ -110,8 +117,7 @@ struct clk *clk_register_mux(struct device *dev, const char *name,
>  	mux->flags = clk_mux_flags;
>  	mux->lock = lock;

There is a mux->hw.init = &init missing here.

Sascha

>  
> -	clk = clk_register(dev, name, &clk_mux_ops, &mux->hw,
> -			parent_names, num_parents, flags);
> +	clk = clk_register(dev, &mux->hw);
>  
>  	if (IS_ERR(clk))
>  		kfree(mux);

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