clk: sunxi: factors: automatic reparenting support

This commit implements .determine_rate, so that our factor clocks can be
reparented when needed.

Signed-off-by: Emilio López <emilio@elopez.com.ar>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/clk/sunxi/clk-factors.c b/drivers/clk/sunxi/clk-factors.c
index 9e232644f07e..3806d97e529b 100644
--- a/drivers/clk/sunxi/clk-factors.c
+++ b/drivers/clk/sunxi/clk-factors.c
@@ -77,6 +77,41 @@ static long clk_factors_round_rate(struct clk_hw *hw, unsigned long rate,
         return rate;
 }
 
+static long clk_factors_determine_rate(struct clk_hw *hw, unsigned long rate,
+                                       unsigned long *best_parent_rate,
+                                       struct clk **best_parent_p)
+{
+        struct clk *clk = hw->clk, *parent, *best_parent = NULL;
+        int i, num_parents;
+        unsigned long parent_rate, best = 0, child_rate, best_child_rate = 0;
+
+        /* find the parent that can help provide the fastest rate <= rate */
+        num_parents = __clk_get_num_parents(clk);
+        for (i = 0; i < num_parents; i++) {
+                parent = clk_get_parent_by_index(clk, i);
+                if (!parent)
+                        continue;
+                if (__clk_get_flags(clk) & CLK_SET_RATE_PARENT)
+                        parent_rate = __clk_round_rate(parent, rate);
+                else
+                        parent_rate = __clk_get_rate(parent);
+
+                child_rate = clk_factors_round_rate(hw, rate, &parent_rate);
+
+                if (child_rate <= rate && child_rate > best_child_rate) {
+                        best_parent = parent;
+                        best = parent_rate;
+                        best_child_rate = child_rate;
+                }
+        }
+
+        if (best_parent)
+                *best_parent_p = best_parent;
+        *best_parent_rate = best;
+
+        return best_child_rate;
+}
+
 static int clk_factors_set_rate(struct clk_hw *hw, unsigned long rate,
                                 unsigned long parent_rate)
 {
@@ -113,6 +148,7 @@ static int clk_factors_set_rate(struct clk_hw *hw, unsigned long rate,
 }
 
 const struct clk_ops clk_factors_ops = {
+        .determine_rate = clk_factors_determine_rate,
         .recalc_rate = clk_factors_recalc_rate,
         .round_rate = clk_factors_round_rate,
         .set_rate = clk_factors_set_rate,