clk/ti/fixed-factor.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * TI Fixed Factor Clock
0004  *
0005  * Copyright (C) 2013 Texas Instruments, Inc.
0006  *
0007  * Tero Kristo <t-kristo@ti.com>
0008  */
0009
0010 #include <linux/clk-provider.h>
0011 #include <linux/slab.h>
0012 #include <linux/err.h>
0013 #include <linux/of.h>
0014 #include <linux/of_address.h>
0015 #include <linux/clk/ti.h>
0016
0017 #include "clock.h"
0018
0019 #undef pr_fmt
0020 #define pr_fmt(fmt) "%s: " fmt, __func__
0021
0022 /**
0023  * of_ti_fixed_factor_clk_setup - Setup function for TI fixed factor clock
0024  * @node: device node for this clock
0025  *
0026  * Sets up a simple fixed factor clock based on device tree info.
0027  */
0028 static void __init of_ti_fixed_factor_clk_setup(struct device_node *node)
0029 {
0030     struct clk *clk;
0031     const char *clk_name = ti_dt_clk_name(node);
0032     const char *parent_name;
0033     u32 div, mult;
0034     u32 flags = 0;
0035
0036     if (of_property_read_u32(node, "ti,clock-div", &div)) {
0037         pr_err("%pOFn must have a clock-div property\n", node);
0038         return;
0039     }
0040
0041     if (of_property_read_u32(node, "ti,clock-mult", &mult)) {
0042         pr_err("%pOFn must have a clock-mult property\n", node);
0043         return;
0044     }
0045
0046     if (of_property_read_bool(node, "ti,set-rate-parent"))
0047         flags |= CLK_SET_RATE_PARENT;
0048
0049     parent_name = of_clk_get_parent_name(node, 0);
0050
0051     clk = clk_register_fixed_factor(NULL, clk_name, parent_name, flags,
0052                     mult, div);
0053
0054     if (!IS_ERR(clk)) {
0055         of_clk_add_provider(node, of_clk_src_simple_get, clk);
0056         of_ti_clk_autoidle_setup(node);
0057         ti_clk_add_alias(NULL, clk, clk_name);
0058     }
0059 }
0060 CLK_OF_DECLARE(ti_fixed_factor_clk, "ti,fixed-factor-clock",
0061            of_ti_fixed_factor_clk_setup);