1 /* 2 * Copyright (C) 2016 Linaro. 3 * Viresh Kumar <viresh.kumar@linaro.org> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 */ 9 10 #include <linux/err.h> 11 #include <linux/of.h> 12 #include <linux/of_device.h> 13 #include <linux/platform_device.h> 14 15 #include "cpufreq-dt.h" 16 17 /* 18 * Machines for which the cpufreq device is *always* created, mostly used for 19 * platforms using "operating-points" (V1) property. 20 */ 21 static const struct of_device_id whitelist[] __initconst = { 22 { .compatible = "allwinner,sun4i-a10", }, 23 { .compatible = "allwinner,sun5i-a10s", }, 24 { .compatible = "allwinner,sun5i-a13", }, 25 { .compatible = "allwinner,sun5i-r8", }, 26 { .compatible = "allwinner,sun6i-a31", }, 27 { .compatible = "allwinner,sun6i-a31s", }, 28 { .compatible = "allwinner,sun7i-a20", }, 29 { .compatible = "allwinner,sun8i-a23", }, 30 { .compatible = "allwinner,sun8i-a83t", }, 31 { .compatible = "allwinner,sun8i-h3", }, 32 33 { .compatible = "apm,xgene-shadowcat", }, 34 35 { .compatible = "arm,integrator-ap", }, 36 { .compatible = "arm,integrator-cp", }, 37 38 { .compatible = "hisilicon,hi3660", }, 39 40 { .compatible = "fsl,imx27", }, 41 { .compatible = "fsl,imx51", }, 42 { .compatible = "fsl,imx53", }, 43 { .compatible = "fsl,imx7d", }, 44 45 { .compatible = "marvell,berlin", }, 46 { .compatible = "marvell,pxa250", }, 47 { .compatible = "marvell,pxa270", }, 48 49 { .compatible = "samsung,exynos3250", }, 50 { .compatible = "samsung,exynos4210", }, 51 { .compatible = "samsung,exynos5250", }, 52 #ifndef CONFIG_BL_SWITCHER 53 { .compatible = "samsung,exynos5800", }, 54 #endif 55 56 { .compatible = "renesas,emev2", }, 57 { .compatible = "renesas,r7s72100", }, 58 { .compatible = "renesas,r8a73a4", }, 59 { .compatible = "renesas,r8a7740", }, 60 { .compatible = "renesas,r8a7743", }, 61 { .compatible = "renesas,r8a7745", }, 62 { .compatible = "renesas,r8a7778", }, 63 { .compatible = "renesas,r8a7779", }, 64 { .compatible = "renesas,r8a7790", }, 65 { .compatible = "renesas,r8a7791", }, 66 { .compatible = "renesas,r8a7792", }, 67 { .compatible = "renesas,r8a7793", }, 68 { .compatible = "renesas,r8a7794", }, 69 { .compatible = "renesas,r8a7795", }, 70 { .compatible = "renesas,r8a7796", }, 71 { .compatible = "renesas,sh73a0", }, 72 73 { .compatible = "rockchip,rk2928", }, 74 { .compatible = "rockchip,rk3036", }, 75 { .compatible = "rockchip,rk3066a", }, 76 { .compatible = "rockchip,rk3066b", }, 77 { .compatible = "rockchip,rk3188", }, 78 { .compatible = "rockchip,rk3228", }, 79 { .compatible = "rockchip,rk3288", }, 80 { .compatible = "rockchip,rk3328", }, 81 { .compatible = "rockchip,rk3366", }, 82 { .compatible = "rockchip,rk3368", }, 83 { .compatible = "rockchip,rk3399", }, 84 85 { .compatible = "st-ericsson,u8500", }, 86 { .compatible = "st-ericsson,u8540", }, 87 { .compatible = "st-ericsson,u9500", }, 88 { .compatible = "st-ericsson,u9540", }, 89 90 { .compatible = "ti,omap2", }, 91 { .compatible = "ti,omap3", }, 92 { .compatible = "ti,omap4", }, 93 { .compatible = "ti,omap5", }, 94 95 { .compatible = "xlnx,zynq-7000", }, 96 { .compatible = "xlnx,zynqmp", }, 97 98 { } 99 }; 100 101 /* 102 * Machines for which the cpufreq device is *not* created, mostly used for 103 * platforms using "operating-points-v2" property. 104 */ 105 static const struct of_device_id blacklist[] __initconst = { 106 { .compatible = "calxeda,highbank", }, 107 { .compatible = "calxeda,ecx-2000", }, 108 109 { .compatible = "marvell,armadaxp", }, 110 111 { .compatible = "mediatek,mt2701", }, 112 { .compatible = "mediatek,mt2712", }, 113 { .compatible = "mediatek,mt7622", }, 114 { .compatible = "mediatek,mt7623", }, 115 { .compatible = "mediatek,mt817x", }, 116 { .compatible = "mediatek,mt8173", }, 117 { .compatible = "mediatek,mt8176", }, 118 119 { .compatible = "nvidia,tegra124", }, 120 121 { .compatible = "st,stih407", }, 122 { .compatible = "st,stih410", }, 123 124 { .compatible = "sigma,tango4", }, 125 126 { .compatible = "ti,am33xx", }, 127 { .compatible = "ti,am43", }, 128 { .compatible = "ti,dra7", }, 129 130 { } 131 }; 132 133 static bool __init cpu0_node_has_opp_v2_prop(void) 134 { 135 struct device_node *np = of_cpu_device_node_get(0); 136 bool ret = false; 137 138 if (of_get_property(np, "operating-points-v2", NULL)) 139 ret = true; 140 141 of_node_put(np); 142 return ret; 143 } 144 145 static int __init cpufreq_dt_platdev_init(void) 146 { 147 struct device_node *np = of_find_node_by_path("/"); 148 const struct of_device_id *match; 149 const void *data = NULL; 150 151 if (!np) 152 return -ENODEV; 153 154 match = of_match_node(whitelist, np); 155 if (match) { 156 data = match->data; 157 goto create_pdev; 158 } 159 160 if (cpu0_node_has_opp_v2_prop() && !of_match_node(blacklist, np)) 161 goto create_pdev; 162 163 of_node_put(np); 164 return -ENODEV; 165 166 create_pdev: 167 of_node_put(np); 168 return PTR_ERR_OR_ZERO(platform_device_register_data(NULL, "cpufreq-dt", 169 -1, data, 170 sizeof(struct cpufreq_dt_platform_data))); 171 } 172 device_initcall(cpufreq_dt_platdev_init); 173