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clk: fractional-divider: Split out clk_fd_get_div() helper

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Split out clk_fd_get_div() helper for the future use elsewhere.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20221122130732.48537-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Andy Shevchenko 2022-11-22 15:07:30 +02:00 committed by Stephen Boyd
parent 9abf2313ad
commit 7fffdb7773
1 changed files with 16 additions and 6 deletions
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22
drivers/clk/clk-fractional-divider.c
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@ -40,6 +40,7 @@
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/math.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/slab.h>
@ -63,14 +64,12 @@ static inline void clk_fd_writel(struct clk_fractional_divider *fd, u32 val)
writel(val, fd->reg);
}
static unsigned long clk_fd_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
static void clk_fd_get_div(struct clk_hw *hw, struct u32_fract *fract)
{
struct clk_fractional_divider *fd = to_clk_fd(hw);
unsigned long flags = 0;
unsigned long m, n;
u32 val;
u64 ret;
if (fd->lock)
spin_lock_irqsave(fd->lock, flags);
@ -92,11 +91,22 @@ static unsigned long clk_fd_recalc_rate(struct clk_hw *hw,
n++;
}
if (!n || !m)
fract->numerator = m;
fract->denominator = n;
}
static unsigned long clk_fd_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
{
struct u32_fract fract;
u64 ret;
clk_fd_get_div(hw, &fract);
if (!fract.numerator || !fract.denominator)
return parent_rate;
ret = (u64)parent_rate * m;
do_div(ret, n);
ret = (u64)parent_rate * fract.numerator;
do_div(ret, fract.denominator);
return ret;
}