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526d239c30
This will allow fixed-clocks to be registered in device tree, which in turn will allow clock clients to look up their clocks in device tree. The first driver to use this feature will be the bcm2835 SDHCI/MMC driver. In the long run, it is likely these fixed clocks will be replaced with an actual clock implementation which speaks to the VideoCore processor, but this change should be transparent to clock consumers. Cc: Mike Turquette <mturquette@linaro.org> Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/*
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* Copyright (C) 2010 Broadcom
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* Copyright (C) 2012 Stephen Warren
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/clk/bcm2835.h>
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#include <linux/clk-provider.h>
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#include <linux/of.h>
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static const __initconst struct of_device_id clk_match[] = {
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{ .compatible = "fixed-clock", .data = of_fixed_clk_setup, },
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{ }
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};
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/*
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* These are fixed clocks. They're probably not all root clocks and it may
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* be possible to turn them on and off but until this is mapped out better
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* it's the only way they can be used.
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*/
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void __init bcm2835_init_clocks(void)
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{
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struct clk *clk;
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int ret;
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clk = clk_register_fixed_rate(NULL, "sys_pclk", NULL, CLK_IS_ROOT,
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250000000);
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if (IS_ERR(clk))
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pr_err("sys_pclk not registered\n");
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clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT,
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126000000);
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if (IS_ERR(clk))
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pr_err("apb_pclk not registered\n");
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clk = clk_register_fixed_rate(NULL, "uart0_pclk", NULL, CLK_IS_ROOT,
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3000000);
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if (IS_ERR(clk))
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pr_err("uart0_pclk not registered\n");
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ret = clk_register_clkdev(clk, NULL, "20201000.uart");
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if (ret)
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pr_err("uart0_pclk alias not registered\n");
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clk = clk_register_fixed_rate(NULL, "uart1_pclk", NULL, CLK_IS_ROOT,
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125000000);
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if (IS_ERR(clk))
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pr_err("uart1_pclk not registered\n");
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ret = clk_register_clkdev(clk, NULL, "20215000.uart");
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if (ret)
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pr_err("uart1_pclk alias not registered\n");
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of_clk_init(clk_match);
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}
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