LXR linux/drivers/clk/ti/fixed-factor.c

   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 */
  36static void __init of_ti_fixed_factor_clk_setup(struct device_node *node)
  37{
  38        struct clk *clk;
  39        const char *clk_name = node->name;
  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("%s must have a clock-div property\n", node->name);
  46                return;
  47        }
  48
  49        if (of_property_read_u32(node, "ti,clock-mult", &mult)) {
  50                pr_err("%s must have a clock-mult property\n", node->name);
  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}
  68CLK_OF_DECLARE(ti_fixed_factor_clk, "ti,fixed-factor-clock",
  69               of_ti_fixed_factor_clk_setup);
  70