Quelle  clk-sun4i-pll3.c   Sprache: 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(sizeof(*gate), GFP_KERNEL);
 if (!gate)
  goto err_unmap;

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

 mult = kzalloc(sizeof(*mult), GFP_KERNEL);
 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);