Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit b82a51e8 authored by Sekhar Nori's avatar Sekhar Nori Committed by Kevin Hilman
Browse files

davinci: support re-parenting a clock in the clock framework 



The clk_set_parent() API is implemented to enable re-parenting
clocks in the clock tree.

This is useful in DVFS and helps by shifting clocks to an asynchronous
domain where supported by hardware

Signed-off-by: default avatarSekhar Nori <nsekhar@ti.com>
Signed-off-by: default avatarKevin Hilman <khilman@deeprootsystems.com>
parent d6a61563

arch/arm/mach-davinci/clock.c

+27 −0
Original line number Diff line number Diff line
@@ -141,6 +141,33 @@ int clk_set_rate(struct clk *clk, unsigned long rate) 
}

EXPORT_SYMBOL(clk_set_rate);



int clk_set_parent(struct clk *clk, struct clk *parent)

{

	unsigned long flags;



	if (clk == NULL || IS_ERR(clk))

		return -EINVAL;



	/* Cannot change parent on enabled clock */

	if (WARN_ON(clk->usecount))

		return -EINVAL;



	mutex_lock(&clocks_mutex);

	clk->parent = parent;

	list_del_init(&clk->childnode);

	list_add(&clk->childnode, &clk->parent->children);

	mutex_unlock(&clocks_mutex);



	spin_lock_irqsave(&clockfw_lock, flags);

	if (clk->recalc)

		clk->rate = clk->recalc(clk);

	propagate_rate(clk);

	spin_unlock_irqrestore(&clockfw_lock, flags);



	return 0;

}

EXPORT_SYMBOL(clk_set_parent);



int clk_register(struct clk *clk)

{

	if (clk == NULL || IS_ERR(clk))