drivers/cpufreq/cpufreq-dt-platdev.c

   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,r8a7744", },
  62         { .compatible = "renesas,r8a7745", },
  63         { .compatible = "renesas,r8a7778", },
  64         { .compatible = "renesas,r8a7779", },
  65         { .compatible = "renesas,r8a7790", },
  66         { .compatible = "renesas,r8a7791", },
  67         { .compatible = "renesas,r8a7792", },
  68         { .compatible = "renesas,r8a7793", },
  69         { .compatible = "renesas,r8a7794", },
  70         { .compatible = "renesas,sh73a0", },
  71
  72         { .compatible = "rockchip,rk2928", },
  73         { .compatible = "rockchip,rk3036", },
  74         { .compatible = "rockchip,rk3066a", },
  75         { .compatible = "rockchip,rk3066b", },
  76         { .compatible = "rockchip,rk3188", },
  77         { .compatible = "rockchip,rk3228", },
  78         { .compatible = "rockchip,rk3288", },
  79         { .compatible = "rockchip,rk3328", },
  80         { .compatible = "rockchip,rk3366", },
  81         { .compatible = "rockchip,rk3368", },
  82         { .compatible = "rockchip,rk3399",
  83           .data = &(struct cpufreq_dt_platform_data)
  84                 { .have_governor_per_policy = true, },
  85         },
  86
  87         { .compatible = "st-ericsson,u8500", },
  88         { .compatible = "st-ericsson,u8540", },
  89         { .compatible = "st-ericsson,u9500", },
  90         { .compatible = "st-ericsson,u9540", },
  91
  92         { .compatible = "ti,omap2", },
  93         { .compatible = "ti,omap3", },
  94         { .compatible = "ti,omap4", },
  95         { .compatible = "ti,omap5", },
  96
  97         { .compatible = "xlnx,zynq-7000", },
  98         { .compatible = "xlnx,zynqmp", },
  99
 100         { }
 101 };
 102
 103 /*
 104  * Machines for which the cpufreq device is *not* created, mostly used for
 105  * platforms using "operating-points-v2" property.
 106  */
 107 static const struct of_device_id blacklist[] __initconst = {
 108         { .compatible = "calxeda,highbank", },
 109         { .compatible = "calxeda,ecx-2000", },
 110
 111         { .compatible = "marvell,armadaxp", },
 112
 113         { .compatible = "mediatek,mt2701", },
 114         { .compatible = "mediatek,mt2712", },
 115         { .compatible = "mediatek,mt7622", },
 116         { .compatible = "mediatek,mt7623", },
 117         { .compatible = "mediatek,mt817x", },
 118         { .compatible = "mediatek,mt8173", },
 119         { .compatible = "mediatek,mt8176", },
 120
 121         { .compatible = "nvidia,tegra124", },
 122
 123         { .compatible = "qcom,apq8096", },
 124         { .compatible = "qcom,msm8996", },
 125
 126         { .compatible = "st,stih407", },
 127         { .compatible = "st,stih410", },
 128
 129         { .compatible = "sigma,tango4", },
 130
 131         { .compatible = "ti,am33xx", },
 132         { .compatible = "ti,am43", },
 133         { .compatible = "ti,dra7", },
 134
 135         { }
 136 };
 137
 138 static bool __init cpu0_node_has_opp_v2_prop(void)
 139 {
 140         struct device_node *np = of_cpu_device_node_get(0);
 141         bool ret = false;
 142
 143         if (of_get_property(np, "operating-points-v2", NULL))
 144                 ret = true;
 145
 146         of_node_put(np);
 147         return ret;
 148 }
 149
 150 static int __init cpufreq_dt_platdev_init(void)
 151 {
 152         struct device_node *np = of_find_node_by_path("/");
 153         const struct of_device_id *match;
 154         const void *data = NULL;
 155
 156         if (!np)
 157                 return -ENODEV;
 158
 159         match = of_match_node(whitelist, np);
 160         if (match) {
 161                 data = match->data;
 162                 goto create_pdev;
 163         }
 164
 165         if (cpu0_node_has_opp_v2_prop() && !of_match_node(blacklist, np))
 166                 goto create_pdev;
 167
 168         of_node_put(np);
 169         return -ENODEV;
 170
 171 create_pdev:
 172         of_node_put(np);
 173         return PTR_ERR_OR_ZERO(platform_device_register_data(NULL, "cpufreq-dt",
 174                                -1, data,
 175                                sizeof(struct cpufreq_dt_platform_data)));
 176 }
 177 device_initcall(cpufreq_dt_platdev_init);