1 /* 2 * OMAP clockdomain support 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/of.h> 21 #include <linux/of_address.h> 22 #include <linux/clk/ti.h> 23 24 #undef pr_fmt 25 #define pr_fmt(fmt) "%s: " fmt, __func__ 26 27 static void __init of_ti_clockdomain_setup(struct device_node *node) 28 { 29 struct clk *clk; 30 struct clk_hw *clk_hw; 31 const char *clkdm_name = node->name; 32 int i; 33 int num_clks; 34 35 num_clks = of_clk_get_parent_count(node); 36 37 for (i = 0; i < num_clks; i++) { 38 clk = of_clk_get(node, i); 39 if (IS_ERR(clk)) { 40 pr_err("%s: Failed get %s' clock nr %d (%ld)\n", 41 __func__, node->full_name, i, PTR_ERR(clk)); 42 continue; 43 } 44 if (__clk_get_flags(clk) & CLK_IS_BASIC) { 45 pr_warn("can't setup clkdm for basic clk %s\n", 46 __clk_get_name(clk)); 47 continue; 48 } 49 clk_hw = __clk_get_hw(clk); 50 to_clk_hw_omap(clk_hw)->clkdm_name = clkdm_name; 51 omap2_init_clk_clkdm(clk_hw); 52 } 53 } 54 55 static const struct of_device_id ti_clkdm_match_table[] __initconst = { 56 { .compatible = "ti,clockdomain" }, 57 { } 58 }; 59 60 /** 61 * ti_dt_clockdomains_setup - setup device tree clockdomains 62 * 63 * Initializes clockdomain nodes for a SoC. This parses through all the 64 * nodes with compatible = "ti,clockdomain", and add the clockdomain 65 * info for all the clocks listed under these. This function shall be 66 * called after rest of the DT clock init has completed and all 67 * clock nodes have been registered. 68 */ 69 void __init ti_dt_clockdomains_setup(void) 70 { 71 struct device_node *np; 72 for_each_matching_node(np, ti_clkdm_match_table) { 73 of_ti_clockdomain_setup(np); 74 } 75 } 76