forked from luck/tmp_suning_uos_patched
a18097b767
Make the behaviour of clk_get_rate consistent with common clk's
clk_get_rate by accepting NULL clocks as parameter. Some device
drivers rely on this, and will cause an OOPS otherwise.
Fixes: 3f0a06b036 ("MIPS: ralink: adds clkdev code")
Reported-by: Mathias Kresin <dev@kresin.me>
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Cc: John Crispin <john@phrozen.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/16778/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
90 lines
1.6 KiB
C
90 lines
1.6 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2013 John Crispin <john@phrozen.org>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/export.h>
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#include <linux/clkdev.h>
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#include <linux/clk.h>
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#include <asm/time.h>
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#include "common.h"
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struct clk {
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struct clk_lookup cl;
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unsigned long rate;
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};
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void ralink_clk_add(const char *dev, unsigned long rate)
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{
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struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
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if (!clk)
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panic("failed to add clock");
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clk->cl.dev_id = dev;
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clk->cl.clk = clk;
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clk->rate = rate;
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clkdev_add(&clk->cl);
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}
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/*
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* Linux clock API
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*/
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int clk_enable(struct clk *clk)
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{
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return 0;
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}
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EXPORT_SYMBOL_GPL(clk_enable);
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void clk_disable(struct clk *clk)
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{
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}
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EXPORT_SYMBOL_GPL(clk_disable);
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unsigned long clk_get_rate(struct clk *clk)
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{
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if (!clk)
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return 0;
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return clk->rate;
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}
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EXPORT_SYMBOL_GPL(clk_get_rate);
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int clk_set_rate(struct clk *clk, unsigned long rate)
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{
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return -1;
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}
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EXPORT_SYMBOL_GPL(clk_set_rate);
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long clk_round_rate(struct clk *clk, unsigned long rate)
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{
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return -1;
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}
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EXPORT_SYMBOL_GPL(clk_round_rate);
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void __init plat_time_init(void)
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{
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struct clk *clk;
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ralink_of_remap();
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ralink_clk_init();
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clk = clk_get_sys("cpu", NULL);
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if (IS_ERR(clk))
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panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
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pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);
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mips_hpt_frequency = clk_get_rate(clk) / 2;
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clk_put(clk);
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timer_probe();
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}
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