63 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright 2013 Emilio López4 *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 014 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