1 /* 2 * TI Fixed Factor Clock 3 * 4 * Copyright (C) 2013 Texas Instruments, Inc. 5 * 6 * Tero Kristo <t-kristo@ti.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 13 * kind, whether express or implied; without even the implied warranty 14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/clk-provider.h> 19 #include <linux/slab.h> 20 #include <linux/err.h> 21 #include <linux/of.h> 22 #include <linux/of_address.h> 23 #include <linux/clk/ti.h> 24 25 #include "clock.h" 26 27 #undef pr_fmt 28 #define pr_fmt(fmt) "%s: " fmt, __func__ 29 30 /** 31 * of_ti_fixed_factor_clk_setup - Setup function for TI fixed factor clock 32 * @node: device node for this clock 33 * 34 * Sets up a simple fixed factor clock based on device tree info. 35 */ 36 static void __init of_ti_fixed_factor_clk_setup(struct device_node *node) 37 { 38 struct clk *clk; 39 const char *clk_name = ti_dt_clk_name(node); 40 const char *parent_name; 41 u32 div, mult; 42 u32 flags = 0; 43 44 if (of_property_read_u32(node, "ti,clock-div", &div)) { 45 pr_err("%pOFn must have a clock-div property\n", node); 46 return; 47 } 48 49 if (of_property_read_u32(node, "ti,clock-mult", &mult)) { 50 pr_err("%pOFn must have a clock-mult property\n", node); 51 return; 52 } 53 54 if (of_property_read_bool(node, "ti,set-rate-parent")) 55 flags |= CLK_SET_RATE_PARENT; 56 57 parent_name = of_clk_get_parent_name(node, 0); 58 59 clk = clk_register_fixed_factor(NULL, clk_name, parent_name, flags, 60 mult, div); 61 62 if (!IS_ERR(clk)) { 63 of_clk_add_provider(node, of_clk_src_simple_get, clk); 64 of_ti_clk_autoidle_setup(node); 65 ti_clk_add_alias(NULL, clk, clk_name); 66 } 67 } 68 CLK_OF_DECLARE(ti_fixed_factor_clk, "ti,fixed-factor-clock", 69 of_ti_fixed_factor_clk_setup); 70