2 * Copyright (C) 2014 Free Electrons
4 * License Terms: GNU General Public License v2
5 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
7 * Allwinner A31 APB0 clock gates driver
11 #include <linux/clk-provider.h>
12 #include <linux/init.h>
14 #include <linux/of_device.h>
15 #include <linux/platform_device.h>
17 #define SUN6I_APB0_GATES_MAX_SIZE 32
20 DECLARE_BITMAP(mask, SUN6I_APB0_GATES_MAX_SIZE);
23 static const struct gates_data sun6i_a31_apb0_gates __initconst = {
27 static const struct gates_data sun8i_a23_apb0_gates __initconst = {
31 static const struct of_device_id sun6i_a31_apb0_gates_clk_dt_ids[] = {
32 { .compatible = "allwinner,sun6i-a31-apb0-gates-clk", .data = &sun6i_a31_apb0_gates },
33 { .compatible = "allwinner,sun8i-a23-apb0-gates-clk", .data = &sun8i_a23_apb0_gates },
37 static int sun6i_a31_apb0_gates_clk_probe(struct platform_device *pdev)
39 struct device_node *np = pdev->dev.of_node;
40 struct clk_onecell_data *clk_data;
41 const struct of_device_id *device;
42 const struct gates_data *data;
43 const char *clk_parent;
54 device = of_match_device(sun6i_a31_apb0_gates_clk_dt_ids, &pdev->dev);
59 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
60 reg = devm_ioremap_resource(&pdev->dev, r);
64 clk_parent = of_clk_get_parent_name(np, 0);
68 clk_data = devm_kzalloc(&pdev->dev, sizeof(struct clk_onecell_data),
73 /* Worst-case size approximation and memory allocation */
74 ngates = find_last_bit(data->mask, SUN6I_APB0_GATES_MAX_SIZE);
75 clk_data->clks = devm_kcalloc(&pdev->dev, (ngates + 1),
76 sizeof(struct clk *), GFP_KERNEL);
80 for_each_set_bit(i, data->mask, SUN6I_APB0_GATES_MAX_SIZE) {
81 of_property_read_string_index(np, "clock-output-names",
84 clk_data->clks[i] = clk_register_gate(&pdev->dev, clk_name,
85 clk_parent, 0, reg, i,
87 WARN_ON(IS_ERR(clk_data->clks[i]));
92 clk_data->clk_num = ngates + 1;
94 return of_clk_add_provider(np, of_clk_src_onecell_get, clk_data);
97 static struct platform_driver sun6i_a31_apb0_gates_clk_driver = {
99 .name = "sun6i-a31-apb0-gates-clk",
100 .of_match_table = sun6i_a31_apb0_gates_clk_dt_ids,
102 .probe = sun6i_a31_apb0_gates_clk_probe,
104 builtin_platform_driver(sun6i_a31_apb0_gates_clk_driver);