drivers/clk/clk-composite.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2013 NVIDIA CORPORATION.  All rights reserved.
  */

 #include <linux/clk-provider.h>
 #include <linux/err.h>
 #include <linux/slab.h>

 static u8 clk_composite_get_parent(struct clk_hw *hw)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *mux_ops = composite->mux_ops;
 	struct clk_hw *mux_hw = composite->mux_hw;

 	__clk_hw_set_clk(mux_hw, hw);

 	return mux_ops->get_parent(mux_hw);
 }

 static int clk_composite_set_parent(struct clk_hw *hw, u8 index)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *mux_ops = composite->mux_ops;
 	struct clk_hw *mux_hw = composite->mux_hw;

 	__clk_hw_set_clk(mux_hw, hw);

 	return mux_ops->set_parent(mux_hw, index);
 }

 static unsigned long clk_composite_recalc_rate(struct clk_hw *hw,
 					    unsigned long parent_rate)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *rate_ops = composite->rate_ops;
 	struct clk_hw *rate_hw = composite->rate_hw;

 	__clk_hw_set_clk(rate_hw, hw);

 	return rate_ops->recalc_rate(rate_hw, parent_rate);
 }

 static int clk_composite_determine_rate(struct clk_hw *hw,
 					struct clk_rate_request *req)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *rate_ops = composite->rate_ops;
 	const struct clk_ops *mux_ops = composite->mux_ops;
 	struct clk_hw *rate_hw = composite->rate_hw;
 	struct clk_hw *mux_hw = composite->mux_hw;
 	struct clk_hw *parent;
 	unsigned long parent_rate;
 	long tmp_rate, best_rate = 0;
 	unsigned long rate_diff;
 	unsigned long best_rate_diff = ULONG_MAX;
 	long rate;
 	int i;

 	if (rate_hw && rate_ops && rate_ops->determine_rate) {
 		__clk_hw_set_clk(rate_hw, hw);
 		return rate_ops->determine_rate(rate_hw, req);
 	} else if (rate_hw && rate_ops && rate_ops->round_rate &&
 		   mux_hw && mux_ops && mux_ops->set_parent) {
 		req->best_parent_hw = NULL;

 		if (clk_hw_get_flags(hw) & CLK_SET_RATE_NO_REPARENT) {
 			parent = clk_hw_get_parent(mux_hw);
 			req->best_parent_hw = parent;
 			req->best_parent_rate = clk_hw_get_rate(parent);

 			rate = rate_ops->round_rate(rate_hw, req->rate,
 						    &req->best_parent_rate);
 			if (rate < 0)
 				return rate;

 			req->rate = rate;
 			return 0;
 		}

 		for (i = 0; i < clk_hw_get_num_parents(mux_hw); i++) {
 			parent = clk_hw_get_parent_by_index(mux_hw, i);
 			if (!parent)
 				continue;

 			parent_rate = clk_hw_get_rate(parent);

 			tmp_rate = rate_ops->round_rate(rate_hw, req->rate,
 							&parent_rate);
 			if (tmp_rate < 0)
 				continue;

 			rate_diff = abs(req->rate - tmp_rate);

 			if (!rate_diff || !req->best_parent_hw
 				       || best_rate_diff > rate_diff) {
 				req->best_parent_hw = parent;
 				req->best_parent_rate = parent_rate;
 				best_rate_diff = rate_diff;
 				best_rate = tmp_rate;
 			}

 			if (!rate_diff)
 				return 0;
 		}

 		req->rate = best_rate;
 		return 0;
 	} else if (mux_hw && mux_ops && mux_ops->determine_rate) {
 		__clk_hw_set_clk(mux_hw, hw);
 		return mux_ops->determine_rate(mux_hw, req);
 	} else {
 		pr_err("clk: clk_composite_determine_rate function called, but no mux or rate callback set!\n");
 		return -EINVAL;
 	}
 }

 static long clk_composite_round_rate(struct clk_hw *hw, unsigned long rate,
 				  unsigned long *prate)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *rate_ops = composite->rate_ops;
 	struct clk_hw *rate_hw = composite->rate_hw;

 	__clk_hw_set_clk(rate_hw, hw);

 	return rate_ops->round_rate(rate_hw, rate, prate);
 }

 static int clk_composite_set_rate(struct clk_hw *hw, unsigned long rate,
 			       unsigned long parent_rate)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *rate_ops = composite->rate_ops;
 	struct clk_hw *rate_hw = composite->rate_hw;

 	__clk_hw_set_clk(rate_hw, hw);

 	return rate_ops->set_rate(rate_hw, rate, parent_rate);
 }

 static int clk_composite_set_rate_and_parent(struct clk_hw *hw,
 					     unsigned long rate,
 					     unsigned long parent_rate,
 					     u8 index)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *rate_ops = composite->rate_ops;
 	const struct clk_ops *mux_ops = composite->mux_ops;
 	struct clk_hw *rate_hw = composite->rate_hw;
 	struct clk_hw *mux_hw = composite->mux_hw;
 	unsigned long temp_rate;

 	__clk_hw_set_clk(rate_hw, hw);
 	__clk_hw_set_clk(mux_hw, hw);

 	temp_rate = rate_ops->recalc_rate(rate_hw, parent_rate);
 	if (temp_rate > rate) {
 		rate_ops->set_rate(rate_hw, rate, parent_rate);
 		mux_ops->set_parent(mux_hw, index);
 	} else {
 		mux_ops->set_parent(mux_hw, index);
 		rate_ops->set_rate(rate_hw, rate, parent_rate);
 	}

 	return 0;
 }

 static int clk_composite_is_enabled(struct clk_hw *hw)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *gate_ops = composite->gate_ops;
 	struct clk_hw *gate_hw = composite->gate_hw;

 	__clk_hw_set_clk(gate_hw, hw);

 	return gate_ops->is_enabled(gate_hw);
 }

 static int clk_composite_enable(struct clk_hw *hw)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *gate_ops = composite->gate_ops;
 	struct clk_hw *gate_hw = composite->gate_hw;

 	__clk_hw_set_clk(gate_hw, hw);

 	return gate_ops->enable(gate_hw);
 }

 static void clk_composite_disable(struct clk_hw *hw)
 {
 	struct clk_composite *composite = to_clk_composite(hw);
 	const struct clk_ops *gate_ops = composite->gate_ops;
 	struct clk_hw *gate_hw = composite->gate_hw;

 	__clk_hw_set_clk(gate_hw, hw);

 	gate_ops->disable(gate_hw);
 }

 static struct clk_hw *__clk_hw_register_composite(struct device *dev,
 			const char *name, const char * const *parent_names,
 			const struct clk_parent_data *pdata, int num_parents,
 			struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
 			struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
 			struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
 			unsigned long flags)
 {
 	struct clk_hw *hw;
 	struct clk_init_data init = {};
 	struct clk_composite *composite;
 	struct clk_ops *clk_composite_ops;
 	int ret;

 	composite = kzalloc(sizeof(*composite), GFP_KERNEL);
 	if (!composite)
 		return ERR_PTR(-ENOMEM);

 	init.name = name;
 	init.flags = flags;
 	if (parent_names)
 		init.parent_names = parent_names;
 	else
 		init.parent_data = pdata;
 	init.num_parents = num_parents;
 	hw = &composite->hw;

 	clk_composite_ops = &composite->ops;

 	if (mux_hw && mux_ops) {
 		if (!mux_ops->get_parent) {
 			hw = ERR_PTR(-EINVAL);
 			goto err;
 		}

 		composite->mux_hw = mux_hw;
 		composite->mux_ops = mux_ops;
 		clk_composite_ops->get_parent = clk_composite_get_parent;
 		if (mux_ops->set_parent)
 			clk_composite_ops->set_parent = clk_composite_set_parent;
 		if (mux_ops->determine_rate)
 			clk_composite_ops->determine_rate = clk_composite_determine_rate;
 	}

 	if (rate_hw && rate_ops) {
 		if (!rate_ops->recalc_rate) {
 			hw = ERR_PTR(-EINVAL);
 			goto err;
 		}
 		clk_composite_ops->recalc_rate = clk_composite_recalc_rate;

 		if (rate_ops->determine_rate)
 			clk_composite_ops->determine_rate =
 				clk_composite_determine_rate;
 		else if (rate_ops->round_rate)
 			clk_composite_ops->round_rate =
 				clk_composite_round_rate;

 		/* .set_rate requires either .round_rate or .determine_rate */
 		if (rate_ops->set_rate) {
 			if (rate_ops->determine_rate || rate_ops->round_rate)
 				clk_composite_ops->set_rate =
 						clk_composite_set_rate;
 			else
 				WARN(1, "%s: missing round_rate op is required\n",
 						__func__);
 		}

 		composite->rate_hw = rate_hw;
 		composite->rate_ops = rate_ops;
 	}

 	if (mux_hw && mux_ops && rate_hw && rate_ops) {
 		if (mux_ops->set_parent && rate_ops->set_rate)
 			clk_composite_ops->set_rate_and_parent =
 			clk_composite_set_rate_and_parent;
 	}

 	if (gate_hw && gate_ops) {
 		if (!gate_ops->is_enabled || !gate_ops->enable ||
 		    !gate_ops->disable) {
 			hw = ERR_PTR(-EINVAL);
 			goto err;
 		}

 		composite->gate_hw = gate_hw;
 		composite->gate_ops = gate_ops;
 		clk_composite_ops->is_enabled = clk_composite_is_enabled;
 		clk_composite_ops->enable = clk_composite_enable;
 		clk_composite_ops->disable = clk_composite_disable;
 	}

 	init.ops = clk_composite_ops;
 	composite->hw.init = &init;

 	ret = clk_hw_register(dev, hw);
 	if (ret) {
 		hw = ERR_PTR(ret);
 		goto err;
 	}

 	if (composite->mux_hw)
 		composite->mux_hw->clk = hw->clk;

 	if (composite->rate_hw)
 		composite->rate_hw->clk = hw->clk;

 	if (composite->gate_hw)
 		composite->gate_hw->clk = hw->clk;

 	return hw;

 err:
 	kfree(composite);
 	return hw;
 }

 struct clk_hw *clk_hw_register_composite(struct device *dev, const char *name,
 			const char * const *parent_names, int num_parents,
 			struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
 			struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
 			struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
 			unsigned long flags)
 {
 	return __clk_hw_register_composite(dev, name, parent_names, NULL,
 					   num_parents, mux_hw, mux_ops,
 					   rate_hw, rate_ops, gate_hw,
 					   gate_ops, flags);
 }
 EXPORT_SYMBOL_GPL(clk_hw_register_composite);

 struct clk_hw *clk_hw_register_composite_pdata(struct device *dev,
 			const char *name,
 			const struct clk_parent_data *parent_data,
 			int num_parents,
 			struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
 			struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
 			struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
 			unsigned long flags)
 {
 	return __clk_hw_register_composite(dev, name, NULL, parent_data,
 					   num_parents, mux_hw, mux_ops,
 					   rate_hw, rate_ops, gate_hw,
 					   gate_ops, flags);
 }

 struct clk *clk_register_composite(struct device *dev, const char *name,
 			const char * const *parent_names, int num_parents,
 			struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
 			struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
 			struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
 			unsigned long flags)
 {
 	struct clk_hw *hw;

 	hw = clk_hw_register_composite(dev, name, parent_names, num_parents,
 			mux_hw, mux_ops, rate_hw, rate_ops, gate_hw, gate_ops,
 			flags);
 	if (IS_ERR(hw))
 		return ERR_CAST(hw);
 	return hw->clk;
 }
 EXPORT_SYMBOL_GPL(clk_register_composite);

 struct clk *clk_register_composite_pdata(struct device *dev, const char *name,
 			const struct clk_parent_data *parent_data,
 			int num_parents,
 			struct clk_hw *mux_hw, const struct clk_ops *mux_ops,
 			struct clk_hw *rate_hw, const struct clk_ops *rate_ops,
 			struct clk_hw *gate_hw, const struct clk_ops *gate_ops,
 			unsigned long flags)
 {
 	struct clk_hw *hw;

 	hw = clk_hw_register_composite_pdata(dev, name, parent_data,
 			num_parents, mux_hw, mux_ops, rate_hw, rate_ops,
 			gate_hw, gate_ops, flags);
 	if (IS_ERR(hw))
 		return ERR_CAST(hw);
 	return hw->clk;
 }

 void clk_unregister_composite(struct clk *clk)
 {
 	struct clk_composite *composite;
 	struct clk_hw *hw;

 	hw = __clk_get_hw(clk);
 	if (!hw)
 		return;

 	composite = to_clk_composite(hw);

 	clk_unregister(clk);
 	kfree(composite);
 }

 void clk_hw_unregister_composite(struct clk_hw *hw)
 {
 	struct clk_composite *composite;

 	composite = to_clk_composite(hw);

 	clk_hw_unregister(hw);
 	kfree(composite);
 }
 EXPORT_SYMBOL_GPL(clk_hw_unregister_composite);
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2013 NVIDIA CORPORATION. All rights reserved.
	*/

	#include <linux/clk-provider.h>
	#include <linux/err.h>
	#include <linux/slab.h>

	static u8 clk_composite_get_parent(struct clk_hw *hw)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *mux_ops = composite->mux_ops;
	struct clk_hw *mux_hw = composite->mux_hw;

	__clk_hw_set_clk(mux_hw, hw);

	return mux_ops->get_parent(mux_hw);
	}

	static int clk_composite_set_parent(struct clk_hw *hw, u8 index)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *mux_ops = composite->mux_ops;
	struct clk_hw *mux_hw = composite->mux_hw;

	__clk_hw_set_clk(mux_hw, hw);

	return mux_ops->set_parent(mux_hw, index);
	}

	static unsigned long clk_composite_recalc_rate(struct clk_hw *hw,
	unsigned long parent_rate)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *rate_ops = composite->rate_ops;
	struct clk_hw *rate_hw = composite->rate_hw;

	__clk_hw_set_clk(rate_hw, hw);

	return rate_ops->recalc_rate(rate_hw, parent_rate);
	}

	static int clk_composite_determine_rate(struct clk_hw *hw,
	struct clk_rate_request *req)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *rate_ops = composite->rate_ops;
	const struct clk_ops *mux_ops = composite->mux_ops;
	struct clk_hw *rate_hw = composite->rate_hw;
	struct clk_hw *mux_hw = composite->mux_hw;
	struct clk_hw *parent;
	unsigned long parent_rate;
	long tmp_rate, best_rate = 0;
	unsigned long rate_diff;
	unsigned long best_rate_diff = ULONG_MAX;
	long rate;
	int i;

	if (rate_hw && rate_ops && rate_ops->determine_rate) {
	__clk_hw_set_clk(rate_hw, hw);
	return rate_ops->determine_rate(rate_hw, req);
	} else if (rate_hw && rate_ops && rate_ops->round_rate &&
	mux_hw && mux_ops && mux_ops->set_parent) {
	req->best_parent_hw = NULL;

	if (clk_hw_get_flags(hw) & CLK_SET_RATE_NO_REPARENT) {
	parent = clk_hw_get_parent(mux_hw);
	req->best_parent_hw = parent;
	req->best_parent_rate = clk_hw_get_rate(parent);

	rate = rate_ops->round_rate(rate_hw, req->rate,
	&req->best_parent_rate);
	if (rate < 0)
	return rate;

	req->rate = rate;
	return 0;
	}

	for (i = 0; i < clk_hw_get_num_parents(mux_hw); i++) {
	parent = clk_hw_get_parent_by_index(mux_hw, i);
	if (!parent)
	continue;

	parent_rate = clk_hw_get_rate(parent);

	tmp_rate = rate_ops->round_rate(rate_hw, req->rate,
	&parent_rate);
	if (tmp_rate < 0)
	continue;

	rate_diff = abs(req->rate - tmp_rate);

	if (!rate_diff \|\| !req->best_parent_hw
	\|\| best_rate_diff > rate_diff) {
	req->best_parent_hw = parent;
	req->best_parent_rate = parent_rate;
	best_rate_diff = rate_diff;
	best_rate = tmp_rate;
	}

	if (!rate_diff)
	return 0;
	}

	req->rate = best_rate;
	return 0;
	} else if (mux_hw && mux_ops && mux_ops->determine_rate) {
	__clk_hw_set_clk(mux_hw, hw);
	return mux_ops->determine_rate(mux_hw, req);
	} else {
	pr_err("clk: clk_composite_determine_rate function called, but no mux or rate callback set!\n");
	return -EINVAL;
	}
	}

	static long clk_composite_round_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long *prate)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *rate_ops = composite->rate_ops;
	struct clk_hw *rate_hw = composite->rate_hw;

	__clk_hw_set_clk(rate_hw, hw);

	return rate_ops->round_rate(rate_hw, rate, prate);
	}

	static int clk_composite_set_rate(struct clk_hw *hw, unsigned long rate,
	unsigned long parent_rate)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *rate_ops = composite->rate_ops;
	struct clk_hw *rate_hw = composite->rate_hw;

	__clk_hw_set_clk(rate_hw, hw);

	return rate_ops->set_rate(rate_hw, rate, parent_rate);
	}

	static int clk_composite_set_rate_and_parent(struct clk_hw *hw,
	unsigned long rate,
	unsigned long parent_rate,
	u8 index)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *rate_ops = composite->rate_ops;
	const struct clk_ops *mux_ops = composite->mux_ops;
	struct clk_hw *rate_hw = composite->rate_hw;
	struct clk_hw *mux_hw = composite->mux_hw;
	unsigned long temp_rate;

	__clk_hw_set_clk(rate_hw, hw);
	__clk_hw_set_clk(mux_hw, hw);

	temp_rate = rate_ops->recalc_rate(rate_hw, parent_rate);
	if (temp_rate > rate) {
	rate_ops->set_rate(rate_hw, rate, parent_rate);
	mux_ops->set_parent(mux_hw, index);
	} else {
	mux_ops->set_parent(mux_hw, index);
	rate_ops->set_rate(rate_hw, rate, parent_rate);
	}

	return 0;
	}

	static int clk_composite_is_enabled(struct clk_hw *hw)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *gate_ops = composite->gate_ops;
	struct clk_hw *gate_hw = composite->gate_hw;

	__clk_hw_set_clk(gate_hw, hw);

	return gate_ops->is_enabled(gate_hw);
	}

	static int clk_composite_enable(struct clk_hw *hw)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *gate_ops = composite->gate_ops;
	struct clk_hw *gate_hw = composite->gate_hw;

	__clk_hw_set_clk(gate_hw, hw);

	return gate_ops->enable(gate_hw);
	}

	static void clk_composite_disable(struct clk_hw *hw)
	{
	struct clk_composite *composite = to_clk_composite(hw);
	const struct clk_ops *gate_ops = composite->gate_ops;
	struct clk_hw *gate_hw = composite->gate_hw;

	__clk_hw_set_clk(gate_hw, hw);

	gate_ops->disable(gate_hw);
	}

	static struct clk_hw __clk_hw_register_composite(struct device dev,
	const char name, const char const *parent_names,
	const struct clk_parent_data *pdata, int num_parents,
	struct clk_hw mux_hw, const struct clk_ops mux_ops,
	struct clk_hw rate_hw, const struct clk_ops rate_ops,
	struct clk_hw gate_hw, const struct clk_ops gate_ops,
	unsigned long flags)
	{
	struct clk_hw *hw;
	struct clk_init_data init = {};
	struct clk_composite *composite;
	struct clk_ops *clk_composite_ops;
	int ret;

	composite = kzalloc(sizeof(*composite), GFP_KERNEL);
	if (!composite)
	return ERR_PTR(-ENOMEM);

	init.name = name;
	init.flags = flags;
	if (parent_names)
	init.parent_names = parent_names;
	else
	init.parent_data = pdata;
	init.num_parents = num_parents;
	hw = &composite->hw;

	clk_composite_ops = &composite->ops;

	if (mux_hw && mux_ops) {
	if (!mux_ops->get_parent) {
	hw = ERR_PTR(-EINVAL);
	goto err;
	}

	composite->mux_hw = mux_hw;
	composite->mux_ops = mux_ops;
	clk_composite_ops->get_parent = clk_composite_get_parent;
	if (mux_ops->set_parent)
	clk_composite_ops->set_parent = clk_composite_set_parent;
	if (mux_ops->determine_rate)
	clk_composite_ops->determine_rate = clk_composite_determine_rate;
	}

	if (rate_hw && rate_ops) {
	if (!rate_ops->recalc_rate) {
	hw = ERR_PTR(-EINVAL);
	goto err;
	}
	clk_composite_ops->recalc_rate = clk_composite_recalc_rate;

	if (rate_ops->determine_rate)
	clk_composite_ops->determine_rate =
	clk_composite_determine_rate;
	else if (rate_ops->round_rate)
	clk_composite_ops->round_rate =
	clk_composite_round_rate;

	/* .set_rate requires either .round_rate or .determine_rate */
	if (rate_ops->set_rate) {
	if (rate_ops->determine_rate \|\| rate_ops->round_rate)
	clk_composite_ops->set_rate =
	clk_composite_set_rate;
	else
	WARN(1, "%s: missing round_rate op is required\n",
	__func__);
	}

	composite->rate_hw = rate_hw;
	composite->rate_ops = rate_ops;
	}

	if (mux_hw && mux_ops && rate_hw && rate_ops) {
	if (mux_ops->set_parent && rate_ops->set_rate)
	clk_composite_ops->set_rate_and_parent =
	clk_composite_set_rate_and_parent;
	}

	if (gate_hw && gate_ops) {
	if (!gate_ops->is_enabled \|\| !gate_ops->enable \|\|
	!gate_ops->disable) {
	hw = ERR_PTR(-EINVAL);
	goto err;
	}

	composite->gate_hw = gate_hw;
	composite->gate_ops = gate_ops;
	clk_composite_ops->is_enabled = clk_composite_is_enabled;
	clk_composite_ops->enable = clk_composite_enable;
	clk_composite_ops->disable = clk_composite_disable;
	}

	init.ops = clk_composite_ops;
	composite->hw.init = &init;

	ret = clk_hw_register(dev, hw);
	if (ret) {
	hw = ERR_PTR(ret);
	goto err;
	}

	if (composite->mux_hw)
	composite->mux_hw->clk = hw->clk;

	if (composite->rate_hw)
	composite->rate_hw->clk = hw->clk;

	if (composite->gate_hw)
	composite->gate_hw->clk = hw->clk;

	return hw;

	err:
	kfree(composite);
	return hw;
	}

	struct clk_hw clk_hw_register_composite(struct device dev, const char *name,
	const char * const *parent_names, int num_parents,
	struct clk_hw mux_hw, const struct clk_ops mux_ops,
	struct clk_hw rate_hw, const struct clk_ops rate_ops,
	struct clk_hw gate_hw, const struct clk_ops gate_ops,
	unsigned long flags)
	{
	return __clk_hw_register_composite(dev, name, parent_names, NULL,
	num_parents, mux_hw, mux_ops,
	rate_hw, rate_ops, gate_hw,
	gate_ops, flags);
	}
	EXPORT_SYMBOL_GPL(clk_hw_register_composite);

	struct clk_hw clk_hw_register_composite_pdata(struct device dev,
	const char *name,
	const struct clk_parent_data *parent_data,
	int num_parents,
	struct clk_hw mux_hw, const struct clk_ops mux_ops,
	struct clk_hw rate_hw, const struct clk_ops rate_ops,
	struct clk_hw gate_hw, const struct clk_ops gate_ops,
	unsigned long flags)
	{
	return __clk_hw_register_composite(dev, name, NULL, parent_data,
	num_parents, mux_hw, mux_ops,
	rate_hw, rate_ops, gate_hw,
	gate_ops, flags);
	}

	struct clk clk_register_composite(struct device dev, const char *name,
	const char * const *parent_names, int num_parents,
	struct clk_hw mux_hw, const struct clk_ops mux_ops,
	struct clk_hw rate_hw, const struct clk_ops rate_ops,
	struct clk_hw gate_hw, const struct clk_ops gate_ops,
	unsigned long flags)
	{
	struct clk_hw *hw;

	hw = clk_hw_register_composite(dev, name, parent_names, num_parents,
	mux_hw, mux_ops, rate_hw, rate_ops, gate_hw, gate_ops,
	flags);
	if (IS_ERR(hw))
	return ERR_CAST(hw);
	return hw->clk;
	}
	EXPORT_SYMBOL_GPL(clk_register_composite);

	struct clk clk_register_composite_pdata(struct device dev, const char *name,
	const struct clk_parent_data *parent_data,
	int num_parents,
	struct clk_hw mux_hw, const struct clk_ops mux_ops,
	struct clk_hw rate_hw, const struct clk_ops rate_ops,
	struct clk_hw gate_hw, const struct clk_ops gate_ops,
	unsigned long flags)
	{
	struct clk_hw *hw;

	hw = clk_hw_register_composite_pdata(dev, name, parent_data,
	num_parents, mux_hw, mux_ops, rate_hw, rate_ops,
	gate_hw, gate_ops, flags);
	if (IS_ERR(hw))
	return ERR_CAST(hw);
	return hw->clk;
	}

	void clk_unregister_composite(struct clk *clk)
	{
	struct clk_composite *composite;
	struct clk_hw *hw;

	hw = __clk_get_hw(clk);
	if (!hw)
	return;

	composite = to_clk_composite(hw);

	clk_unregister(clk);
	kfree(composite);
	}

	void clk_hw_unregister_composite(struct clk_hw *hw)
	{
	struct clk_composite *composite;

	composite = to_clk_composite(hw);

	clk_hw_unregister(hw);
	kfree(composite);
	}
	EXPORT_SYMBOL_GPL(clk_hw_unregister_composite);