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/*
* clk-fixed.c - generic barebox clock support. Based on Linux clk support
*
* Copyright (c) 2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <common.h>
#include <malloc.h>
#include <linux/clk.h>
#include <linux/err.h>
struct clk_fixed {
struct clk clk;
unsigned long rate;
};
static unsigned long clk_fixed_recalc_rate(struct clk *clk,
unsigned long parent_rate)
{
struct clk_fixed *fix = container_of(clk, struct clk_fixed, clk);
return fix->rate;
}
static struct clk_ops clk_fixed_ops = {
.recalc_rate = clk_fixed_recalc_rate,
.is_enabled = clk_is_enabled_always,
};
struct clk *clk_fixed(const char *name, int rate)
{
struct clk_fixed *fix = xzalloc(sizeof *fix);
int ret;
fix->rate = rate;
fix->clk.ops = &clk_fixed_ops;
fix->clk.name = name;
ret = clk_register(&fix->clk);
if (ret) {
free(fix);
return ERR_PTR(ret);
}
return &fix->clk;
}
#if defined(CONFIG_COMMON_CLK_OF_PROVIDER)
/**
* of_fixed_clk_setup() - Setup function for simple fixed rate clock
*/
static int of_fixed_clk_setup(struct device_node *node)
{
struct clk *clk;
const char *clk_name = node->name;
u32 rate;
if (of_property_read_u32(node, "clock-frequency", &rate))
return -EINVAL;
of_property_read_string(node, "clock-output-names", &clk_name);
clk = clk_fixed(clk_name, rate);
if (IS_ERR(clk))
return IS_ERR(clk);
return of_clk_add_provider(node, of_clk_src_simple_get, clk);
}
CLK_OF_DECLARE(fixed_clk, "fixed-clock", of_fixed_clk_setup);
#endif
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