original development tree for Linux kernel GTP module; now long in mainline.
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/*
* Copyright (C) 2012 ST Microelectronics
* Viresh Kumar <viresh.linux@gmail.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*
* SPEAr clk - Common routines
*/
#include <linux/clk-provider.h>
#include <linux/types.h>
#include "clk.h"
long clk_round_rate_index(struct clk_hw *hw, unsigned long drate,
unsigned long parent_rate, clk_calc_rate calc_rate, u8 rtbl_cnt,
int *index)
{
unsigned long prev_rate, rate = 0;
for (*index = 0; *index < rtbl_cnt; (*index)++) {
prev_rate = rate;
rate = calc_rate(hw, parent_rate, *index);
if (drate < rate) {
/* previous clock was best */
if (*index) {
rate = prev_rate;
(*index)--;
}
break;
}
}
return rate;
}