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clk: mmp: add init callback for clk-frac

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For the clk-frac, we need to make sure that the initial
clock rate is one item of the table.
If it is not, we use the first item in the table by default.

Signed-off-by: Chao Xie <chao.xie@marvell.com>
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Michael Turquette <mturquette@linaro.org>
This commit is contained in:
Chao Xie 2014-10-31 10:13:43 +08:00 committed by Michael Turquette
parent 6125613391
commit 0c4c11f355
1 changed files with 40 additions and 0 deletions
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40
drivers/clk/mmp/clk-frac.c
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@ -118,10 +118,50 @@ static int clk_factor_set_rate(struct clk_hw *hw, unsigned long drate,
return 0;
}
void clk_factor_init(struct clk_hw *hw)
{
struct mmp_clk_factor *factor = to_clk_factor(hw);
struct mmp_clk_factor_masks *masks = factor->masks;
u32 val, num, den;
int i;
unsigned long flags = 0;
if (factor->lock)
spin_lock_irqsave(factor->lock, flags);
val = readl(factor->base);
/* calculate numerator */
num = (val >> masks->num_shift) & masks->num_mask;
/* calculate denominator */
den = (val >> masks->den_shift) & masks->den_mask;
for (i = 0; i < factor->ftbl_cnt; i++)
if (den == factor->ftbl[i].den && num == factor->ftbl[i].num)
break;
if (i >= factor->ftbl_cnt) {
val &= ~(masks->num_mask << masks->num_shift);
val |= (factor->ftbl[0].num & masks->num_mask) <<
masks->num_shift;
val &= ~(masks->den_mask << masks->den_shift);
val |= (factor->ftbl[0].den & masks->den_mask) <<
masks->den_shift;
writel(val, factor->base);
}
if (factor->lock)
spin_unlock_irqrestore(factor->lock, flags);
}
static struct clk_ops clk_factor_ops = {
.recalc_rate = clk_factor_recalc_rate,
.round_rate = clk_factor_round_rate,
.set_rate = clk_factor_set_rate,
.init = clk_factor_init,
};
struct clk *mmp_clk_register_factor(const char *name, const char *parent_name,