projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 57a1fbf2 CYT |
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 | ||
| 51 | const struct of_device_id sun8i_a23_apb0_clk_dt_ids[] = { | |
| 52 | { .compatible = "allwinner,sun8i-a23-apb0-clk" }, | |
| 53 | { /* sentinel */ } | |
| 54 | }; | |
| 55 | ||
| 56 | static struct platform_driver sun8i_a23_apb0_clk_driver = { | |
| 57 | .driver = { | |
| 58 | .name = "sun8i-a23-apb0-clk", | |
| 59 | .owner = THIS_MODULE, | |
| 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"); |