linux-sg2042/drivers/clk/ti/clk-54xx.c

/*
 * OMAP5 Clock init
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/io.h>
#include <linux/clk/ti.h>

#include "clock.h"

#define OMAP5_DPLL_ABE_DEFFREQ				98304000

/*
 * OMAP543x TRM, section "3.6.3.9.5 DPLL_USB Preferred Settings"
 * states it must be at 960MHz
 */
#define OMAP5_DPLL_USB_DEFFREQ				960000000

static struct ti_dt_clk omap54xx_clks[] = {
	DT_CLK(NULL, "timer_32k_ck", "sys_32k_ck"),
	DT_CLK(NULL, "sys_clkin_ck", "sys_clkin"),
	{ .node_name = NULL },
};

int __init omap5xxx_dt_clk_init(void)
{
	int rc;
	struct clk *abe_dpll_ref, *abe_dpll, *sys_32k_ck, *usb_dpll;

	ti_dt_clocks_register(omap54xx_clks);

	omap2_clk_disable_autoidle_all();

	ti_clk_add_aliases();

	abe_dpll_ref = clk_get_sys(NULL, "abe_dpll_clk_mux");
	sys_32k_ck = clk_get_sys(NULL, "sys_32k_ck");
	rc = clk_set_parent(abe_dpll_ref, sys_32k_ck);
	abe_dpll = clk_get_sys(NULL, "dpll_abe_ck");
	if (!rc)
		rc = clk_set_rate(abe_dpll, OMAP5_DPLL_ABE_DEFFREQ);
	if (rc)
		pr_err("%s: failed to configure ABE DPLL!\n", __func__);

	abe_dpll = clk_get_sys(NULL, "dpll_abe_m2x2_ck");
	if (!rc)
		rc = clk_set_rate(abe_dpll, OMAP5_DPLL_ABE_DEFFREQ * 2);
	if (rc)
		pr_err("%s: failed to configure ABE m2x2 DPLL!\n", __func__);

	usb_dpll = clk_get_sys(NULL, "dpll_usb_ck");
	rc = clk_set_rate(usb_dpll, OMAP5_DPLL_USB_DEFFREQ);
	if (rc)
		pr_err("%s: failed to configure USB DPLL!\n", __func__);

	usb_dpll = clk_get_sys(NULL, "dpll_usb_m2_ck");
	rc = clk_set_rate(usb_dpll, OMAP5_DPLL_USB_DEFFREQ/2);
	if (rc)
		pr_err("%s: failed to set USB_DPLL M2 OUT\n", __func__);

	return 0;
}