73 lines
2.3 KiB
Diff
73 lines
2.3 KiB
Diff
From b416520f239aeaa4207ebe84c22247cff2da444f Mon Sep 17 00:00:00 2001
|
|
From: =?UTF-8?q?Emilio=20L=C3=B3pez?= <emilio@elopez.com.ar>
|
|
Date: Thu, 5 Sep 2013 19:52:41 -0300
|
|
Subject: [PATCH] clk: sunxi: factors: automatic reparenting support
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
This commit implements .determine_rate, so that our factor clocks can be
|
|
reparented when needed.
|
|
|
|
Signed-off-by: Emilio López <emilio@elopez.com.ar>
|
|
---
|
|
drivers/clk/sunxi/clk-factors.c | 36 ++++++++++++++++++++++++++++++++++++
|
|
1 file changed, 36 insertions(+)
|
|
|
|
diff --git a/drivers/clk/sunxi/clk-factors.c b/drivers/clk/sunxi/clk-factors.c
|
|
index 9e23264..3806d97 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,
|
|
--
|
|
2.0.3
|
|
|