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