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AT91 slow clk is a clk multiplexer. In some SoCs (sam9x5, sama5, sam9g45 families) this multiplexer can choose among 2 sources: an internal RC oscillator circuit and an oscillator using an external crystal. In other Socs (sam9260 family) the multiplexer source is hardcoded with the OSCSEL signal. Signed-off-by: Boris BREZILLON <boris.brezillon@free-electrons.com> Acked-by: Mike Turquette <mturquette@linaro.org> Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/*
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* drivers/clk/at91/sckc.c
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*
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* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
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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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*/
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/io.h>
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#include "sckc.h"
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static const struct of_device_id sckc_clk_ids[] __initconst = {
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/* Slow clock */
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{
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.compatible = "atmel,at91sam9x5-clk-slow-osc",
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.data = of_at91sam9x5_clk_slow_osc_setup,
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},
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{
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.compatible = "atmel,at91sam9x5-clk-slow-rc-osc",
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.data = of_at91sam9x5_clk_slow_rc_osc_setup,
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},
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{
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.compatible = "atmel,at91sam9x5-clk-slow",
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.data = of_at91sam9x5_clk_slow_setup,
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},
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{ /*sentinel*/ }
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};
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static void __init of_at91sam9x5_sckc_setup(struct device_node *np)
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{
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struct device_node *childnp;
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void (*clk_setup)(struct device_node *, void __iomem *);
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const struct of_device_id *clk_id;
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void __iomem *regbase = of_iomap(np, 0);
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if (!regbase)
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return;
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for_each_child_of_node(np, childnp) {
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clk_id = of_match_node(sckc_clk_ids, childnp);
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if (!clk_id)
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continue;
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clk_setup = clk_id->data;
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clk_setup(childnp, regbase);
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}
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}
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CLK_OF_DECLARE(at91sam9x5_clk_sckc, "atmel,at91sam9x5-sckc",
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of_at91sam9x5_sckc_setup);
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