From 365d851d4c1c5994300f6660d02c0ab094cc5ff3 Mon Sep 17 00:00:00 2001
From: Afzal Mohammed <afzal@ti.com>
Date: Tue, 22 Jan 2013 20:33:56 +0530
Subject: [PATCH 07/51] clk: divider: handle minimum divider

Some of clocks can have a limit on minimum divider value that can be
programmed. Modify basic clock divider to take care of this aspect.

Signed-off-by: Afzal Mohammed <afzal@ti.com>
---
 drivers/clk/clk-divider.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index da121ac..9f5f8e7 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -32,6 +32,11 @@
 
 #define div_mask(d)    ((1 << ((d)->width)) - 1)
 
+static unsigned int _get_mindiv(struct clk_divider *divider)
+{
+       return divider->min_div;
+}
+
 static unsigned int _get_table_maxdiv(const struct clk_div_table *table)
 {
        unsigned int maxdiv = 0;
@@ -149,18 +154,19 @@ static int clk_divider_bestdiv(struct clk_hw *hw, unsigned long rate,
 {
        struct clk_divider *divider = to_clk_divider(hw);
        int i, bestdiv = 0;
-       unsigned long parent_rate, best = 0, now, maxdiv;
+       unsigned long parent_rate, best = 0, now, maxdiv, mindiv;
        unsigned long parent_rate_saved = *best_parent_rate;
 
        if (!rate)
                rate = 1;
 
        maxdiv = _get_maxdiv(divider);
+       mindiv = _get_mindiv(divider);
 
        if (!(__clk_get_flags(hw->clk) & CLK_SET_RATE_PARENT)) {
                parent_rate = *best_parent_rate;
                bestdiv = DIV_ROUND_UP(parent_rate, rate);
-               bestdiv = bestdiv == 0 ? 1 : bestdiv;
+               bestdiv = bestdiv == 0 ? mindiv : bestdiv;
                bestdiv = bestdiv > maxdiv ? maxdiv : bestdiv;
                return bestdiv;
        }
@@ -171,7 +177,7 @@ static int clk_divider_bestdiv(struct clk_hw *hw, unsigned long rate,
         */
        maxdiv = min(ULONG_MAX / rate, maxdiv);
 
-       for (i = 1; i <= maxdiv; i++) {
+       for (i = mindiv; i <= maxdiv; i++) {
                if (!_is_valid_div(divider, i))
                        continue;
                if (rate * i == parent_rate_saved) {
-- 
1.7.10.4