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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: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
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1 changed files with 27 additions and 0 deletions
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@ -141,6 +141,33 @@ int clk_set_rate(struct clk *clk, unsigned long rate)
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}
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EXPORT_SYMBOL(clk_set_rate);
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int clk_set_parent(struct clk *clk, struct clk *parent)
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{
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unsigned long flags;
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if (clk == NULL || IS_ERR(clk))
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return -EINVAL;
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/* Cannot change parent on enabled clock */
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if (WARN_ON(clk->usecount))
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return -EINVAL;
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mutex_lock(&clocks_mutex);
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clk->parent = parent;
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list_del_init(&clk->childnode);
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list_add(&clk->childnode, &clk->parent->children);
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mutex_unlock(&clocks_mutex);
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spin_lock_irqsave(&clockfw_lock, flags);
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if (clk->recalc)
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clk->rate = clk->recalc(clk);
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propagate_rate(clk);
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spin_unlock_irqrestore(&clockfw_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(clk_set_parent);
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int clk_register(struct clk *clk)
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{
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if (clk == NULL || IS_ERR(clk))
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