Chen-Yu Tsai | 57a1fbf2 | 2014-07-03 22:55:41 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 Chen-Yu Tsai |
| 3 | * Author: Chen-Yu Tsai <wens@csie.org> |
| 4 | * |
| 5 | * Allwinner A23 APB0 clock driver |
| 6 | * |
| 7 | * License Terms: GNU General Public License v2 |
| 8 | * |
| 9 | * Based on clk-sun6i-apb0.c |
| 10 | * Allwinner A31 APB0 clock driver |
| 11 | * |
| 12 | * Copyright (C) 2014 Free Electrons |
| 13 | * Author: Boris BREZILLON <boris.brezillon@free-electrons.com> |
| 14 | * |
| 15 | */ |
| 16 | |
| 17 | #include <linux/clk-provider.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/of.h> |
| 20 | #include <linux/platform_device.h> |
| 21 | |
| 22 | static int sun8i_a23_apb0_clk_probe(struct platform_device *pdev) |
| 23 | { |
| 24 | struct device_node *np = pdev->dev.of_node; |
| 25 | const char *clk_name = np->name; |
| 26 | const char *clk_parent; |
| 27 | struct resource *r; |
| 28 | void __iomem *reg; |
| 29 | struct clk *clk; |
| 30 | |
| 31 | r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 32 | reg = devm_ioremap_resource(&pdev->dev, r); |
| 33 | if (IS_ERR(reg)) |
| 34 | return PTR_ERR(reg); |
| 35 | |
| 36 | clk_parent = of_clk_get_parent_name(np, 0); |
| 37 | if (!clk_parent) |
| 38 | return -EINVAL; |
| 39 | |
| 40 | of_property_read_string(np, "clock-output-names", &clk_name); |
| 41 | |
| 42 | /* The A23 APB0 clock is a standard 2 bit wide divider clock */ |
| 43 | clk = clk_register_divider(&pdev->dev, clk_name, clk_parent, 0, reg, |
| 44 | 0, 2, CLK_DIVIDER_POWER_OF_TWO, NULL); |
| 45 | if (IS_ERR(clk)) |
| 46 | return PTR_ERR(clk); |
| 47 | |
| 48 | return of_clk_add_provider(np, of_clk_src_simple_get, clk); |
| 49 | } |
| 50 | |
Emilio López | 381c1cc | 2014-07-28 00:49:43 -0300 | [diff] [blame] | 51 | static const struct of_device_id sun8i_a23_apb0_clk_dt_ids[] = { |
Chen-Yu Tsai | 57a1fbf2 | 2014-07-03 22:55:41 +0800 | [diff] [blame] | 52 | { .compatible = "allwinner,sun8i-a23-apb0-clk" }, |
| 53 | { /* sentinel */ } |
| 54 | }; |
Luis de Bethencourt | 6ed5f8e | 2015-08-28 14:44:14 +0200 | [diff] [blame] | 55 | MODULE_DEVICE_TABLE(of, sun8i_a23_apb0_clk_dt_ids); |
Chen-Yu Tsai | 57a1fbf2 | 2014-07-03 22:55:41 +0800 | [diff] [blame] | 56 | |
| 57 | static struct platform_driver sun8i_a23_apb0_clk_driver = { |
| 58 | .driver = { |
| 59 | .name = "sun8i-a23-apb0-clk", |
Chen-Yu Tsai | 57a1fbf2 | 2014-07-03 22:55:41 +0800 | [diff] [blame] | 60 | .of_match_table = sun8i_a23_apb0_clk_dt_ids, |
| 61 | }, |
| 62 | .probe = sun8i_a23_apb0_clk_probe, |
| 63 | }; |
| 64 | module_platform_driver(sun8i_a23_apb0_clk_driver); |
| 65 | |
| 66 | MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>"); |
| 67 | MODULE_DESCRIPTION("Allwinner A23 APB0 clock Driver"); |
| 68 | MODULE_LICENSE("GPL v2"); |