// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 2013 Emilio López
 *
 * Emilio López <emilio@elopez.com.ar>
 */

#include <linux/clk-provider.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/slab.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_obj(struct clk_fixed_rate);
        if (!fixed)
                return;
        gate = kzalloc_obj(struct clk_gate);
        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, 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_fixed:
        kfree(fixed);
}
CLK_OF_DECLARE(sun4i_osc, "allwinner,sun4i-a10-osc-clk", sun4i_osc_clk_setup);