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 */
 21static 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 */
105static 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
133static 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
145static 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
166create_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}
172device_initcall(cpufreq_dt_platdev_init);