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kernel add
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/*
* Copyright (c) 2013 MundoReader S.L.
* Author: Heiko Stuebner <heiko@sntech.de>
*
* 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>
static DEFINE_SPINLOCK(clk_lock);
/*
* Gate clocks
*/
static void __init rk2928_gate_clk_init(struct device_node *node)
{
struct clk_onecell_data *clk_data;
const char *clk_parent;
const char *clk_name;
void __iomem *reg;
void __iomem *reg_idx;
int flags;
int qty;
int reg_bit;
int clkflags = CLK_SET_RATE_PARENT;
int i;
qty = of_property_count_strings(node, "clock-output-names");
if (qty < 0) {
pr_err("%s: error in clock-output-names %d
", __func__, qty);
return;
}
if (qty == 0) {
pr_info("%s: nothing to do
", __func__);
return;
}
reg = of_iomap(node, 0);
clk_data = kzalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
if (!clk_data)
return;
clk_data->clks = kzalloc(qty * sizeof(struct clk *), GFP_KERNEL);
if (!clk_data->clks) {
kfree(clk_data);
return;
}
flags = CLK_GATE_HIWORD_MASK | CLK_GATE_SET_TO_DISABLE;
for (i = 0; i < qty; i++) {
of_property_read_string_index(node, "clock-output-names",
i, &clk_name);
/* ignore empty slots */
if (!strcmp("reserved", clk_name))
continue;
clk_parent = of_clk_get_parent_name(node, i);
/* keep all gates untouched for now */
clkflags |= CLK_IGNORE_UNUSED;
reg_idx = reg + (4 * (i / 16));
reg_bit = (i % 16);
clk_data->clks[i] = clk_register_gate(NULL, clk_name,
clk_parent, clkflags,
reg_idx, reg_bit,
flags,
&clk_lock);
WARN_ON(IS_ERR(clk_data->clks[i]));
}
clk_data->clk_num = qty;
of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
}
CLK_OF_DECLARE(rk2928_gate, "rockchip,rk2928-gate-clk", rk2928_gate_clk_init);
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