linux_kernel/drivers/clk/ti/clockdomain.c

/*
 * OMAP clockdomain support
 *
 * Copyright (C) 2013 Texas Instruments, Inc.
 *
 * Tero Kristo <t-kristo@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/clk-provider.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/clk/ti.h>

#undef pr_fmt
#define pr_fmt(fmt) "%s: " fmt, __func__

static void __init of_ti_clockdomain_setup(struct device_node *node)
{
	struct clk *clk;
	struct clk_hw *clk_hw;
	const char *clkdm_name = node->name;
	int i;
	int num_clks;

	num_clks = of_count_phandle_with_args(node, "clocks", "#clock-cells");

	for (i = 0; i < num_clks; i++) {
		clk = of_clk_get(node, i);
		if (IS_ERR(clk)) {
			pr_err("%s: Failed get %s' clock nr %d (%ld)\n",
			       __func__, node->full_name, i, PTR_ERR(clk));
			continue;
		}
		if (__clk_get_flags(clk) & CLK_IS_BASIC) {
			pr_warn("can't setup clkdm for basic clk %s\n",
				__clk_get_name(clk));
			continue;
		}
		clk_hw = __clk_get_hw(clk);
		to_clk_hw_omap(clk_hw)->clkdm_name = clkdm_name;
		omap2_init_clk_clkdm(clk_hw);
	}
}

static struct of_device_id ti_clkdm_match_table[] __initdata = {
	{ .compatible = "ti,clockdomain" },
	{ }
};

/**
 * ti_dt_clockdomains_setup - setup device tree clockdomains
 *
 * Initializes clockdomain nodes for a SoC. This parses through all the
 * nodes with compatible = "ti,clockdomain", and add the clockdomain
 * info for all the clocks listed under these. This function shall be
 * called after rest of the DT clock init has completed and all
 * clock nodes have been registered.
 */
void __init ti_dt_clockdomains_setup(void)
{
	struct device_node *np;
	for_each_matching_node(np, ti_clkdm_match_table) {
		of_ti_clockdomain_setup(np);
	}
}