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Commit b904878a authored by David Dai's avatar David Dai Committed by Gerrit - the friendly Code Review server
Browse files

clk: Add support to set custom flags with clk_set_flags 



The new API clk_set_flags could be used by hardware specific clock drivers
or clients for specific hardware requirements. These flags could be custom
defined as per hardware needs.

Change-Id: Ia67373ee2b8934c898052c68338fa86cb16070dd
Signed-off-by: default avatarTaniya Das <tdas@codeaurora.org>
Signed-off-by: default avatarDeepak Katragadda <dkatraga@codeaurora.org>
Signed-off-by: default avatarDavid Dai <daidavid1@codeaurora.org>
parent 72969e94

drivers/clk/clk.c

+12 −0
Original line number Diff line number Diff line
@@ -2604,6 +2604,18 @@ bool clk_is_match(const struct clk *p, const struct clk *q) 
}

EXPORT_SYMBOL_GPL(clk_is_match);



int clk_set_flags(struct clk *clk, unsigned long flags)

{

	if (!clk)

		return 0;



	if (!clk->core->ops->set_flags)

		return -EINVAL;



	return clk->core->ops->set_flags(clk->core->hw, flags);

}

EXPORT_SYMBOL_GPL(clk_set_flags);



/***        debugfs support        ***/



#ifdef CONFIG_DEBUG_FS

drivers/clk/qcom/clk-branch.c

+49 −1
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (c) 2013, The Linux Foundation. All rights reserved.

 * Copyright (c) 2013, 2017, The Linux Foundation. All rights reserved.

 */



#include <linux/kernel.h>
@@ -117,15 +117,62 @@ static int clk_branch_enable(struct clk_hw *hw) 
	return clk_branch_toggle(hw, true, clk_branch_check_halt);

}



static int clk_cbcr_set_flags(struct regmap *regmap, unsigned int reg,

				unsigned long flags)

{

	u32 cbcr_val;



	regmap_read(regmap, reg, &cbcr_val);



	switch (flags) {

	case CLKFLAG_PERIPH_OFF_SET:

		cbcr_val |= BIT(12);

		break;

	case CLKFLAG_PERIPH_OFF_CLEAR:

		cbcr_val &= ~BIT(12);

		break;

	case CLKFLAG_RETAIN_PERIPH:

		cbcr_val |= BIT(13);

		break;

	case CLKFLAG_NORETAIN_PERIPH:

		cbcr_val &= ~BIT(13);

		break;

	case CLKFLAG_RETAIN_MEM:

		cbcr_val |= BIT(14);

		break;

	case CLKFLAG_NORETAIN_MEM:

		cbcr_val &= ~BIT(14);

		break;

	default:

		return -EINVAL;

	}



	regmap_write(regmap, reg, cbcr_val);



	/* Make sure power is enabled/disabled before returning. */

	mb();

	udelay(1);



	return 0;

}



static void clk_branch_disable(struct clk_hw *hw)

{

	clk_branch_toggle(hw, false, clk_branch_check_halt);

}



static int clk_branch_set_flags(struct clk_hw *hw, unsigned int flags)

{

	struct clk_branch *br = to_clk_branch(hw);



	return clk_cbcr_set_flags(br->clkr.regmap, br->halt_reg, flags);

}



const struct clk_ops clk_branch_ops = {

	.enable = clk_branch_enable,

	.disable = clk_branch_disable,

	.is_enabled = clk_is_enabled_regmap,

	.set_flags = clk_branch_set_flags,

};

EXPORT_SYMBOL_GPL(clk_branch_ops);
@@ -143,6 +190,7 @@ const struct clk_ops clk_branch2_ops = { 
	.enable = clk_branch2_enable,

	.disable = clk_branch2_disable,

	.is_enabled = clk_is_enabled_regmap,

	.set_flags = clk_branch_set_flags,

};

EXPORT_SYMBOL_GPL(clk_branch2_ops);

drivers/clk/qcom/clk-branch.h

+10 −1
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/* Copyright (c) 2013, The Linux Foundation. All rights reserved. */

/* Copyright (c) 2013, 2017, The Linux Foundation. All rights reserved. */



#ifndef __QCOM_CLK_BRANCH_H__

#define __QCOM_CLK_BRANCH_H__
@@ -44,4 +44,13 @@ extern const struct clk_ops clk_branch_simple_ops; 
#define to_clk_branch(_hw) \

	container_of(to_clk_regmap(_hw), struct clk_branch, clkr)



enum branch_mem_flags {

	CLKFLAG_RETAIN_PERIPH,

	CLKFLAG_NORETAIN_PERIPH,

	CLKFLAG_RETAIN_MEM,

	CLKFLAG_NORETAIN_MEM,

	CLKFLAG_PERIPH_OFF_SET,

	CLKFLAG_PERIPH_OFF_CLEAR,

};



#endif

drivers/clk/qcom/clk-dummy.c

+6 −0
Original line number Diff line number Diff line
@@ -43,10 +43,16 @@ static unsigned long dummy_clk_recalc_rate(struct clk_hw *hw, 
	return dummy->rrate;

}



static int dummy_clk_set_flags(struct clk_hw *hw, unsigned int flags)

{

	return 0;

}



const struct clk_ops clk_dummy_ops = {

	.set_rate = dummy_clk_set_rate,

	.round_rate = dummy_clk_round_rate,

	.recalc_rate = dummy_clk_recalc_rate,

	.set_flags = dummy_clk_set_flags,

};

EXPORT_SYMBOL(clk_dummy_ops);

include/linux/clk-provider.h

+3 −0
Original line number Diff line number Diff line
@@ -202,6 +202,8 @@ struct clk_duty { 
 *		directory is provided as an argument.  Called with

 *		prepare_lock held.  Returns 0 on success, -EERROR otherwise.

 *

 * @set_flags: Set custom flags which deal with hardware specifics. Returns 0

 *	       on success, -EERROR otherwise.

 *

 * The clk_enable/clk_disable and clk_prepare/clk_unprepare pairs allow

 * implementations to split any work between atomic (enable) and sleepable
@@ -246,6 +248,7 @@ struct clk_ops { 
					  struct clk_duty *duty);

	void		(*init)(struct clk_hw *hw);

	void		(*debug_init)(struct clk_hw *hw, struct dentry *dentry);

	int		(*set_flags)(struct clk_hw *hw, unsigned int flags);

};



/**