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 15 static DEFINE_SPINLOCK(hosc_lock); 16 17 static 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 57 err_free_gate: 58 kfree(gate); 59 err_free_fixed: 60 kfree(fixed); 61 } 62 CLK_OF_DECLARE(sun4i_osc, "allwinner,sun4i-a10-osc-clk", sun4i_osc_clk_setup); 63