clk.c

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/*
 * Copyright (C) 2012 ST Microelectronics
 * Viresh Kumar <[email protected]>
 *
 * 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;
}