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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/of.h>
#include <linux/of_address.h>
#include <linux/slab.h>
static DEFINE_SPINLOCK(mod1_lock);
#define SUN4I_MOD1_ENABLE 31
#define SUN4I_MOD1_MUX 16
#define SUN4I_MOD1_MUX_WIDTH 2
#define SUN4I_MOD1_MAX_PARENTS 4
static void __init sun4i_mod1_clk_setup(struct device_node *node)
{
struct clk *clk;
struct clk_mux *mux;
struct clk_gate *gate;
const char *parents[4];
const char *clk_name = node->name;
void __iomem *reg;
int i;
reg = of_io_request_and_map(node, 0, of_node_full_name(node));
if (IS_ERR(reg))
return;
mux = kzalloc(sizeof(*mux), GFP_KERNEL);
if (!mux)
goto err_unmap;
gate = kzalloc(sizeof(*gate), GFP_KERNEL);
if (!gate)
goto err_free_mux;
of_property_read_string(node, "clock-output-names", &clk_name);
i = of_clk_parent_fill(node, parents, SUN4I_MOD1_MAX_PARENTS);
gate->reg = reg;
gate->bit_idx = SUN4I_MOD1_ENABLE;
gate->lock = &mod1_lock;
mux->reg = reg;
mux->shift = SUN4I_MOD1_MUX;
mux->mask = BIT(SUN4I_MOD1_MUX_WIDTH) - 1;
mux->lock = &mod1_lock;
clk = clk_register_composite(NULL, clk_name, parents, i,
&mux->hw, &clk_mux_ops,
NULL, NULL,
&gate->hw, &clk_gate_ops, 0);
if (IS_ERR(clk))
goto err_free_gate;
of_clk_add_provider(node, of_clk_src_simple_get, clk);
return;
err_free_gate:
kfree(gate);
err_free_mux:
kfree(mux);
err_unmap:
iounmap(reg);
}
CLK_OF_DECLARE(sun4i_mod1, "allwinner,sun4i-a10-mod1-clk",
sun4i_mod1_clk_setup);
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