Commit 27d54591 authored by Mike Turquette's avatar Mike Turquette
Browse files

clk: basic: improve parent_names & return errors 



This patch is the basic clk version of 'clk: core: copy parent_names &
return error codes'.

The registration functions are changed to allow the core code to copy
the array of strings and allow platforms to declare those arrays as
__initdata.

This patch also converts all of the basic clk registration functions to
return error codes which better aligns them with the existing clk.h api.

Signed-off-by: default avatarMike Turquette <mturquette@linaro.org>
parent d1302a36

drivers/clk/clk-divider.c

+19 −15
Original line number Diff line number Diff line
@@ -153,6 +153,18 @@ const struct clk_ops clk_divider_ops = { 
};

EXPORT_SYMBOL_GPL(clk_divider_ops);



/**

 * clk_register_divider - register a divider clock with the clock framework

 * @dev: device registering this clock

 * @name: name of this clock

 * @parent_name: name of clock's parent

 * @flags: framework-specific flags

 * @reg: register address to adjust divider

 * @shift: number of bits to shift the bitfield

 * @width: width of the bitfield

 * @clk_divider_flags: divider-specific flags for this clock

 * @lock: shared register lock for this clock

 */

struct clk *clk_register_divider(struct device *dev, const char *name,

		const char *parent_name, unsigned long flags,

		void __iomem *reg, u8 shift, u8 width,
@@ -161,11 +173,11 @@ struct clk *clk_register_divider(struct device *dev, const char *name, 
	struct clk_divider *div;

	struct clk *clk;



	/* allocate the divider */

	div = kzalloc(sizeof(struct clk_divider), GFP_KERNEL);



	if (!div) {

		pr_err("%s: could not allocate divider clk\n", __func__);

		return NULL;

		return ERR_PTR(-ENOMEM);

	}



	/* struct clk_divider assignments */
@@ -175,23 +187,15 @@ struct clk *clk_register_divider(struct device *dev, const char *name, 
	div->flags = clk_divider_flags;

	div->lock = lock;



	if (parent_name) {

		div->parent[0] = kstrdup(parent_name, GFP_KERNEL);

		if (!div->parent[0])

			goto out;

	}



	/* register the clock */

	clk = clk_register(dev, name,

			&clk_divider_ops, &div->hw,

			div->parent,

			(parent_name ? &parent_name: NULL),

			(parent_name ? 1 : 0),

			flags);

	if (clk)

		return clk;



out:

	kfree(div->parent[0]);

	if (IS_ERR(clk))

		kfree(div);



	return NULL;

	return clk;

}

drivers/clk/clk-fixed-rate.c

+18 −22
Original line number Diff line number Diff line
@@ -38,16 +38,23 @@ const struct clk_ops clk_fixed_rate_ops = { 
};

EXPORT_SYMBOL_GPL(clk_fixed_rate_ops);



/**

 * clk_register_fixed_rate - register fixed-rate clock with the clock framework

 * @dev: device that is registering this clock

 * @name: name of this clock

 * @parent_name: name of clock's parent

 * @flags: framework-specific flags

 * @fixed_rate: non-adjustable clock rate

 */

struct clk *clk_register_fixed_rate(struct device *dev, const char *name,

		const char *parent_name, unsigned long flags,

		unsigned long fixed_rate)

{

	struct clk_fixed_rate *fixed;

	char **parent_names = NULL;

	u8 len;

	struct clk *clk;



	/* allocate fixed-rate clock */

	fixed = kzalloc(sizeof(struct clk_fixed_rate), GFP_KERNEL);



	if (!fixed) {

		pr_err("%s: could not allocate fixed clk\n", __func__);

		return ERR_PTR(-ENOMEM);
@@ -56,26 +63,15 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name, 
	/* struct clk_fixed_rate assignments */

	fixed->fixed_rate = fixed_rate;



	if (parent_name) {

		parent_names = kmalloc(sizeof(char *), GFP_KERNEL);



		if (! parent_names)

			goto out;



		len = sizeof(char) * strlen(parent_name);



		parent_names[0] = kmalloc(len, GFP_KERNEL);



		if (!parent_names[0])

			goto out;



		strncpy(parent_names[0], parent_name, len);

	}



out:

	return clk_register(dev, name,

	/* register the clock */

	clk = clk_register(dev, name,

			&clk_fixed_rate_ops, &fixed->hw,

			parent_names,

			(parent_name ? &parent_name : NULL),

			(parent_name ? 1 : 0),

			flags);



	if (IS_ERR(clk))

		kfree(fixed);



	return clk;

}

drivers/clk/clk-gate.c

+19 −15
Original line number Diff line number Diff line
@@ -105,6 +105,17 @@ const struct clk_ops clk_gate_ops = { 
};

EXPORT_SYMBOL_GPL(clk_gate_ops);



/**

 * clk_register_gate - register a gate clock with the clock framework

 * @dev: device that is registering this clock

 * @name: name of this clock

 * @parent_name: name of this clock's parent

 * @flags: framework-specific flags for this clock

 * @reg: register address to control gating of this clock

 * @bit_idx: which bit in the register controls gating of this clock

 * @clk_gate_flags: gate-specific flags for this clock

 * @lock: shared register lock for this clock

 */

struct clk *clk_register_gate(struct device *dev, const char *name,

		const char *parent_name, unsigned long flags,

		void __iomem *reg, u8 bit_idx,
@@ -113,11 +124,11 @@ struct clk *clk_register_gate(struct device *dev, const char *name, 
	struct clk_gate *gate;

	struct clk *clk;



	/* allocate the gate */

	gate = kzalloc(sizeof(struct clk_gate), GFP_KERNEL);



	if (!gate) {

		pr_err("%s: could not allocate gated clk\n", __func__);

		return NULL;

		return ERR_PTR(-ENOMEM);

	}



	/* struct clk_gate assignments */
@@ -126,22 +137,15 @@ struct clk *clk_register_gate(struct device *dev, const char *name, 
	gate->flags = clk_gate_flags;

	gate->lock = lock;



	if (parent_name) {

		gate->parent[0] = kstrdup(parent_name, GFP_KERNEL);

		if (!gate->parent[0])

			goto out;

	}



	/* register the clock */

	clk = clk_register(dev, name,

			&clk_gate_ops, &gate->hw,

			gate->parent,

			(parent_name ? &parent_name : NULL),

			(parent_name ? 1 : 0),

			flags);

	if (clk)

		return clk;

out:

	kfree(gate->parent[0]);



	if (IS_ERR(clk))

		kfree(gate);



	return NULL;

	return clk;

}

drivers/clk/clk-mux.c

+8 −2
Original line number Diff line number Diff line
@@ -94,9 +94,10 @@ struct clk *clk_register_mux(struct device *dev, const char *name, 
		u8 clk_mux_flags, spinlock_t *lock)

{

	struct clk_mux *mux;

	struct clk *clk;



	/* allocate the mux */

	mux = kzalloc(sizeof(struct clk_mux), GFP_KERNEL);



	if (!mux) {

		pr_err("%s: could not allocate mux clk\n", __func__);

		return ERR_PTR(-ENOMEM);
@@ -109,6 +110,11 @@ struct clk *clk_register_mux(struct device *dev, const char *name, 
	mux->flags = clk_mux_flags;

	mux->lock = lock;



	return clk_register(dev, name, &clk_mux_ops, &mux->hw,

	clk = clk_register(dev, name, &clk_mux_ops, &mux->hw,

			parent_names, num_parents, flags);



	if (IS_ERR(clk))

		kfree(mux);



	return clk;

}

include/linux/clk-provider.h

+0 −2
Original line number Diff line number Diff line
@@ -176,7 +176,6 @@ struct clk_gate { 
	u8		bit_idx;

	u8		flags;

	spinlock_t	*lock;

	const char	*parent[1];

};



#define CLK_GATE_SET_TO_DISABLE		BIT(0)
@@ -214,7 +213,6 @@ struct clk_divider { 
	u8		width;

	u8		flags;

	spinlock_t	*lock;

	const char	*parent[1];

};



#define CLK_DIVIDER_ONE_BASED		BIT(0)

CRA Git | Maintained and supported by SUSTech CRA and CCSE