80eded6ce8
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
/*
|
|
* drivers/clk/at91/sckc.c
|
|
*
|
|
* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/clkdev.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/io.h>
|
|
|
|
#include "sckc.h"
|
|
|
|
static const struct of_device_id sckc_clk_ids[] __initconst = {
|
|
/* Slow clock */
|
|
{
|
|
.compatible = "atmel,at91sam9x5-clk-slow-osc",
|
|
.data = of_at91sam9x5_clk_slow_osc_setup,
|
|
},
|
|
{
|
|
.compatible = "atmel,at91sam9x5-clk-slow-rc-osc",
|
|
.data = of_at91sam9x5_clk_slow_rc_osc_setup,
|
|
},
|
|
{
|
|
.compatible = "atmel,at91sam9x5-clk-slow",
|
|
.data = of_at91sam9x5_clk_slow_setup,
|
|
},
|
|
{ /*sentinel*/ }
|
|
};
|
|
|
|
static void __init of_at91sam9x5_sckc_setup(struct device_node *np)
|
|
{
|
|
struct device_node *childnp;
|
|
void (*clk_setup)(struct device_node *, void __iomem *);
|
|
const struct of_device_id *clk_id;
|
|
void __iomem *regbase = of_iomap(np, 0);
|
|
|
|
if (!regbase)
|
|
return;
|
|
|
|
for_each_child_of_node(np, childnp) {
|
|
clk_id = of_match_node(sckc_clk_ids, childnp);
|
|
if (!clk_id)
|
|
continue;
|
|
clk_setup = clk_id->data;
|
|
clk_setup(childnp, regbase);
|
|
}
|
|
}
|
|
CLK_OF_DECLARE(at91sam9x5_clk_sckc, "atmel,at91sam9x5-sckc",
|
|
of_at91sam9x5_sckc_setup);
|