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kernel add
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/*
* Copyright 2013 Emilio López
*
* Emilio López <emilio@elopez.com.ar>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/of.h>
#include <linux/of_address.h>
#define SUNXI_OSC24M_GATE 0
static DEFINE_SPINLOCK(hosc_lock);
static void __init sun4i_osc_clk_setup(struct device_node *node)
{
struct clk *clk;
struct clk_fixed_rate *fixed;
struct clk_gate *gate;
const char *clk_name = node->name;
u32 rate;
if (of_property_read_u32(node, "clock-frequency", &rate))
return;
/* allocate fixed-rate and gate clock structs */
fixed = kzalloc(sizeof(struct clk_fixed_rate), GFP_KERNEL);
if (!fixed)
return;
gate = kzalloc(sizeof(struct clk_gate), GFP_KERNEL);
if (!gate)
goto err_free_fixed;
of_property_read_string(node, "clock-output-names", &clk_name);
/* set up gate and fixed rate properties */
gate->reg = of_iomap(node, 0);
gate->bit_idx = SUNXI_OSC24M_GATE;
gate->lock = &hosc_lock;
fixed->fixed_rate = rate;
clk = clk_register_composite(NULL, clk_name,
NULL, 0,
NULL, NULL,
&fixed->hw, &clk_fixed_rate_ops,
&gate->hw, &clk_gate_ops,
CLK_IS_ROOT);
if (IS_ERR(clk))
goto err_free_gate;
of_clk_add_provider(node, of_clk_src_simple_get, clk);
clk_register_clkdev(clk, clk_name, NULL);
return;
err_free_gate:
kfree(gate);
err_free_fixed:
kfree(fixed);
}
CLK_OF_DECLARE(sun4i_osc, "allwinner,sun4i-a10-osc-clk", sun4i_osc_clk_setup);
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