1 /* 2 * Copyright (C) 2012 ST Microelectronics 3 * Viresh Kumar <vireshk@kernel.org> 4 * 5 * This file is licensed under the terms of the GNU General Public 6 * License version 2. This program is licensed "as is" without any 7 * warranty of any kind, whether express or implied. 8 * 9 * SPEAr clk - Common routines 10 */ 11 12 #include <linux/clk-provider.h> 13 #include <linux/types.h> 14 #include "clk.h" 15 16 long clk_round_rate_index(struct clk_hw *hw, unsigned long drate, 17 unsigned long parent_rate, clk_calc_rate calc_rate, u8 rtbl_cnt, 18 int *index) 19 { 20 unsigned long prev_rate, rate = 0; 21 22 for (*index = 0; *index < rtbl_cnt; (*index)++) { 23 prev_rate = rate; 24 rate = calc_rate(hw, parent_rate, *index); 25 if (drate < rate) { 26 /* previous clock was best */ 27 if (*index) { 28 rate = prev_rate; 29 (*index)--; 30 } 31 break; 32 } 33 } 34 35 if ((*index) == rtbl_cnt) 36 (*index)--; 37 38 return rate; 39 } 40