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clk: clk_set_parent() with current parent shouldn't fail
If a driver calls clk_set_parent(clk, parent) and parent is the current parent of clk we shouldn't fail in any case. Unfortunately if clk is a read-only mux we return -ENOSYS because we think we can't change the parent, except for in this special case where we don't actually need to change the parent at all. Return 0 in such a situation. Signed-off-by: Stephen Boyd <sboyd@codeaurora.org> Acked-by: Philipp Zabel <p.zabel@pengutronix.de> Signed-off-by: Michael Turquette <mturquette@linaro.org>
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@ -2055,16 +2055,18 @@ static int clk_core_set_parent(struct clk_core *clk, struct clk_core *parent)
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if (!clk)
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return 0;
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/* verify ops for for multi-parent clks */
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if ((clk->num_parents > 1) && (!clk->ops->set_parent))
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return -ENOSYS;
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/* prevent racing with updates to the clock topology */
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clk_prepare_lock();
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if (clk->parent == parent)
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goto out;
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/* verify ops for for multi-parent clks */
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if ((clk->num_parents > 1) && (!clk->ops->set_parent)) {
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ret = -ENOSYS;
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goto out;
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}
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/* check that we are allowed to re-parent if the clock is in use */
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if ((clk->flags & CLK_SET_PARENT_GATE) && clk->prepare_count) {
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ret = -EBUSY;
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