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 static 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"); 69