LXR linux/drivers/clk/sunxi/clk-a10-hosc.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright 2013 Emilio López
   4 *
   5 * Emilio López <emilio@elopez.com.ar>
   6 */
   7
   8#include <linux/clk-provider.h>
   9#include <linux/of.h>
  10#include <linux/of_address.h>
  11#include <linux/slab.h>
  12
  13#define SUNXI_OSC24M_GATE       0
  14
  15static DEFINE_SPINLOCK(hosc_lock);
  16
  17static void __init sun4i_osc_clk_setup(struct device_node *node)
  18{
  19        struct clk *clk;
  20        struct clk_fixed_rate *fixed;
  21        struct clk_gate *gate;
  22        const char *clk_name = node->name;
  23        u32 rate;
  24
  25        if (of_property_read_u32(node, "clock-frequency", &rate))
  26                return;
  27
  28        /* allocate fixed-rate and gate clock structs */
  29        fixed = kzalloc(sizeof(struct clk_fixed_rate), GFP_KERNEL);
  30        if (!fixed)
  31                return;
  32        gate = kzalloc(sizeof(struct clk_gate), GFP_KERNEL);
  33        if (!gate)
  34                goto err_free_fixed;
  35
  36        of_property_read_string(node, "clock-output-names", &clk_name);
  37
  38        /* set up gate and fixed rate properties */
  39        gate->reg = of_iomap(node, 0);
  40        gate->bit_idx = SUNXI_OSC24M_GATE;
  41        gate->lock = &hosc_lock;
  42        fixed->fixed_rate = rate;
  43
  44        clk = clk_register_composite(NULL, clk_name,
  45                        NULL, 0,
  46                        NULL, NULL,
  47                        &fixed->hw, &clk_fixed_rate_ops,
  48                        &gate->hw, &clk_gate_ops, 0);
  49
  50        if (IS_ERR(clk))
  51                goto err_free_gate;
  52
  53        of_clk_add_provider(node, of_clk_src_simple_get, clk);
  54
  55        return;
  56
  57err_free_gate:
  58        kfree(gate);
  59err_free_fixed:
  60        kfree(fixed);
  61}
  62CLK_OF_DECLARE(sun4i_osc, "allwinner,sun4i-a10-osc-clk", sun4i_osc_clk_setup);
  63