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