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,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 = "nvidia,tegra124", },
 112
 113         { .compatible = "st,stih407", },
 114         { .compatible = "st,stih410", },
 115
 116         { .compatible = "sigma,tango4", },
 117
 118         { .compatible = "ti,am33xx", },
 119         { .compatible = "ti,am43", },
 120         { .compatible = "ti,dra7", },
 121
 122         { }
 123 };
 124
 125 static bool __init cpu0_node_has_opp_v2_prop(void)
 126 {
 127         struct device_node *np = of_cpu_device_node_get(0);
 128         bool ret = false;
 129
 130         if (of_get_property(np, "operating-points-v2", NULL))
 131                 ret = true;
 132
 133         of_node_put(np);
 134         return ret;
 135 }
 136
 137 static int __init cpufreq_dt_platdev_init(void)
 138 {
 139         struct device_node *np = of_find_node_by_path("/");
 140         const struct of_device_id *match;
 141         const void *data = NULL;
 142
 143         if (!np)
 144                 return -ENODEV;
 145
 146         match = of_match_node(whitelist, np);
 147         if (match) {
 148                 data = match->data;
 149                 goto create_pdev;
 150         }
 151
 152         if (cpu0_node_has_opp_v2_prop() && !of_match_node(blacklist, np))
 153                 goto create_pdev;
 154
 155         of_node_put(np);
 156         return -ENODEV;
 157
 158 create_pdev:
 159         of_node_put(np);
 160         return PTR_ERR_OR_ZERO(platform_device_register_data(NULL, "cpufreq-dt",
 161                                -1, data,
 162                                sizeof(struct cpufreq_dt_platform_data)));
 163 }
 164 device_initcall(cpufreq_dt_platdev_init);