0197b3ea0f
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@codeaurora.org> [mturquette@linaro.org: kept DEFINE_CLK_* macros and __clk_init] Signed-off-by: Mike Turquette <mturquette@linaro.org> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Rob Herring <rob.herring@calxeda.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Jeremy Kerr <jeremy.kerr@canonical.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Arnd Bergman <arnd.bergmann@linaro.org> Cc: Paul Walmsley <paul@pwsan.com> Cc: Shawn Guo <shawn.guo@freescale.com> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: Jamie Iles <jamie@jamieiles.com> Cc: Richard Zhao <richard.zhao@linaro.org> Cc: Saravana Kannan <skannan@codeaurora.org> Cc: Magnus Damm <magnus.damm@gmail.com> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: Linus Walleij <linus.walleij@stericsson.com> Cc: Stephen Boyd <sboyd@codeaurora.org> Cc: Amit Kucheria <amit.kucheria@linaro.org> Cc: Deepak Saxena <dsaxena@linaro.org> Cc: Grant Likely <grant.likely@secretlab.ca>
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/*
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* Copyright (C) 2010-2011 Canonical Ltd <jeremy.kerr@canonical.com>
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* Copyright (C) 2011-2012 Mike Turquette, Linaro Ltd <mturquette@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Fixed rate clock implementation
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*/
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#include <linux/clk-provider.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/err.h>
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/*
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* DOC: basic fixed-rate clock that cannot gate
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*
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* Traits of this clock:
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* prepare - clk_(un)prepare only ensures parents are prepared
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* enable - clk_enable only ensures parents are enabled
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* rate - rate is always a fixed value. No clk_set_rate support
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* parent - fixed parent. No clk_set_parent support
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*/
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#define to_clk_fixed_rate(_hw) container_of(_hw, struct clk_fixed_rate, hw)
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static unsigned long clk_fixed_rate_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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return to_clk_fixed_rate(hw)->fixed_rate;
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}
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const struct clk_ops clk_fixed_rate_ops = {
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.recalc_rate = clk_fixed_rate_recalc_rate,
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};
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EXPORT_SYMBOL_GPL(clk_fixed_rate_ops);
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/**
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* clk_register_fixed_rate - register fixed-rate clock with the clock framework
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* @dev: device that is registering this clock
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* @name: name of this clock
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* @parent_name: name of clock's parent
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* @flags: framework-specific flags
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* @fixed_rate: non-adjustable clock rate
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*/
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struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
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const char *parent_name, unsigned long flags,
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unsigned long fixed_rate)
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{
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struct clk_fixed_rate *fixed;
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struct clk *clk;
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struct clk_init_data init;
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/* allocate fixed-rate clock */
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fixed = kzalloc(sizeof(struct clk_fixed_rate), GFP_KERNEL);
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if (!fixed) {
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pr_err("%s: could not allocate fixed clk\n", __func__);
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return ERR_PTR(-ENOMEM);
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}
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init.name = name;
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init.ops = &clk_fixed_rate_ops;
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init.flags = flags;
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init.parent_names = (parent_name ? &parent_name: NULL);
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init.num_parents = (parent_name ? 1 : 0);
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/* struct clk_fixed_rate assignments */
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fixed->fixed_rate = fixed_rate;
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fixed->hw.init = &init;
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/* register the clock */
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clk = clk_register(dev, &fixed->hw);
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if (IS_ERR(clk))
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kfree(fixed);
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return clk;
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}
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