drivers/clk/sunxi/clk-sun4i-pll3.c

root/drivers/clk/sunxi/clk-sun4i-pll3.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright 2015 Maxime Ripard
 *
 * Maxime Ripard <maxime.ripard@free-electrons.com>
 */

#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

#define SUN4I_A10_PLL3_GATE_BIT 31
#define SUN4I_A10_PLL3_DIV_WIDTH        7
#define SUN4I_A10_PLL3_DIV_SHIFT        0

static DEFINE_SPINLOCK(sun4i_a10_pll3_lock);

static void __init sun4i_a10_pll3_setup(struct device_node *node)
{
        const char *clk_name = node->name, *parent;
        struct clk_multiplier *mult;
        struct clk_gate *gate;
        struct resource res;
        void __iomem *reg;
        struct clk *clk;
        int ret;

        of_property_read_string(node, "clock-output-names", &clk_name);
        parent = of_clk_get_parent_name(node, 0);

        reg = of_io_request_and_map(node, 0, of_node_full_name(node));
        if (IS_ERR(reg)) {
                pr_err("%s: Could not map the clock registers\n", clk_name);
                return;
        }

        gate = kzalloc_obj(*gate);
        if (!gate)
                goto err_unmap;

        gate->reg = reg;
        gate->bit_idx = SUN4I_A10_PLL3_GATE_BIT;
        gate->lock = &sun4i_a10_pll3_lock;

        mult = kzalloc_obj(*mult);
        if (!mult)
                goto err_free_gate;

        mult->reg = reg;
        mult->shift = SUN4I_A10_PLL3_DIV_SHIFT;
        mult->width = SUN4I_A10_PLL3_DIV_WIDTH;
        mult->lock = &sun4i_a10_pll3_lock;

        clk = clk_register_composite(NULL, clk_name,
                                     &parent, 1,
                                     NULL, NULL,
                                     &mult->hw, &clk_multiplier_ops,
                                     &gate->hw, &clk_gate_ops,
                                     0);
        if (IS_ERR(clk)) {
                pr_err("%s: Couldn't register the clock\n", clk_name);
                goto err_free_mult;
        }

        ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
        if (ret) {
                pr_err("%s: Couldn't register DT provider\n",
                       clk_name);
                goto err_clk_unregister;
        }

        return;

err_clk_unregister:
        clk_unregister_composite(clk);
err_free_mult:
        kfree(mult);
err_free_gate:
        kfree(gate);
err_unmap:
        iounmap(reg);
        of_address_to_resource(node, 0, &res);
        release_mem_region(res.start, resource_size(&res));
}

CLK_OF_DECLARE(sun4i_a10_pll3, "allwinner,sun4i-a10-pll3-clk",
               sun4i_a10_pll3_setup);
Linux
