1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2014 Free Electrons
5 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
7 * Allwinner A31 APB0 clock gates driver
10 #include <linux/clk-provider.h>
11 #include <linux/init.h>
13 #include <linux/of_device.h>
14 #include <linux/platform_device.h>
16 #define SUN6I_APB0_GATES_MAX_SIZE 32
19 DECLARE_BITMAP(mask, SUN6I_APB0_GATES_MAX_SIZE);
22 static const struct gates_data sun6i_a31_apb0_gates __initconst = {
26 static const struct gates_data sun8i_a23_apb0_gates __initconst = {
30 static const struct of_device_id sun6i_a31_apb0_gates_clk_dt_ids[] = {
31 { .compatible = "allwinner,sun6i-a31-apb0-gates-clk", .data = &sun6i_a31_apb0_gates },
32 { .compatible = "allwinner,sun8i-a23-apb0-gates-clk", .data = &sun8i_a23_apb0_gates },
36 static int sun6i_a31_apb0_gates_clk_probe(struct platform_device *pdev)
38 struct device_node *np = pdev->dev.of_node;
39 struct clk_onecell_data *clk_data;
40 const struct gates_data *data;
41 const char *clk_parent;
52 data = of_device_get_match_data(&pdev->dev);
56 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
57 reg = devm_ioremap_resource(&pdev->dev, r);
61 clk_parent = of_clk_get_parent_name(np, 0);
65 clk_data = devm_kzalloc(&pdev->dev, sizeof(struct clk_onecell_data),
70 /* Worst-case size approximation and memory allocation */
71 ngates = find_last_bit(data->mask, SUN6I_APB0_GATES_MAX_SIZE);
72 clk_data->clks = devm_kcalloc(&pdev->dev, (ngates + 1),
73 sizeof(struct clk *), GFP_KERNEL);
77 for_each_set_bit(i, data->mask, SUN6I_APB0_GATES_MAX_SIZE) {
78 of_property_read_string_index(np, "clock-output-names",
81 clk_data->clks[i] = clk_register_gate(&pdev->dev, clk_name,
82 clk_parent, 0, reg, i,
84 WARN_ON(IS_ERR(clk_data->clks[i]));
89 clk_data->clk_num = ngates + 1;
91 return of_clk_add_provider(np, of_clk_src_onecell_get, clk_data);
94 static struct platform_driver sun6i_a31_apb0_gates_clk_driver = {
96 .name = "sun6i-a31-apb0-gates-clk",
97 .of_match_table = sun6i_a31_apb0_gates_clk_dt_ids,
99 .probe = sun6i_a31_apb0_gates_clk_probe,
101 builtin_platform_driver(sun6i_a31_apb0_gates_clk_driver);