1 // SPDX-License-Identifier: GPL-2.0
5  * The sun50i-cpufreq-nvmem driver reads the efuse value from the SoC to
13 #include <linux/arm-smccc.h>
16 #include <linux/nvmem-consumer.h>
42 	 * the slowest bin. Expected efuse values are 1-3, slowest  in sun50i_h6_efuse_xlate()
46 		return efuse_value - 1;  in sun50i_h6_efuse_xlate()
79  * returned speedbin index is 4 -> 0/2 -> 3 -> 1, from worst to best.
118 		pr_warn("sun50i-cpufreq-nvmem: unknown speed bin 0x%x, using default bin 0\n",  in sun50i_h616_efuse_xlate()
140 	{ .compatible = "allwinner,sun50i-h6-operating-points",
143 	{ .compatible = "allwinner,sun50i-a100-operating-points",
146 	{ .compatible = "allwinner,sun50i-h616-operating-points",
153  * dt_has_supported_hw() - Check if any OPPs use opp-supported-hw
155  * If we ask the cpufreq framework to use the opp-supported-hw feature, it
159  * Returns true if we have at least one OPP with the opp-supported-hw property.
176 		if (of_property_present(opp, "opp-supported-hw")) {  in dt_has_supported_hw()
186  * sun50i_cpufreq_get_efuse() - Determine speed grade from efuse value
188  * Returns non-negative speed bin index on success, a negative error
202 		return -ENODEV;  in sun50i_cpufreq_get_efuse()
207 		return -ENOENT;  in sun50i_cpufreq_get_efuse()
211 		return -ENOENT;  in sun50i_cpufreq_get_efuse()
213 	opp_data = match->data;  in sun50i_cpufreq_get_efuse()
225 	ret = opp_data->efuse_xlate(*speedbin);  in sun50i_cpufreq_get_efuse()
238 	int speed;  in sun50i_cpufreq_nvmem_probe()  local
244 		return -ENOMEM;  in sun50i_cpufreq_nvmem_probe()
246 	speed = sun50i_cpufreq_get_efuse();  in sun50i_cpufreq_nvmem_probe()
247 	if (speed < 0) {  in sun50i_cpufreq_nvmem_probe()
249 		return speed;  in sun50i_cpufreq_nvmem_probe()
253 	 * We need at least one OPP with the "opp-supported-hw" property,  in sun50i_cpufreq_nvmem_probe()
257 		supported_hw = 1U << speed;  in sun50i_cpufreq_nvmem_probe()
262 	snprintf(name, sizeof(name), "speed%d", speed);  in sun50i_cpufreq_nvmem_probe()
269 			ret = -ENODEV;  in sun50i_cpufreq_nvmem_probe()
280 	cpufreq_dt_pdev = platform_device_register_simple("cpufreq-dt", -1,  in sun50i_cpufreq_nvmem_probe()
315 		.name = "sun50i-cpufreq-nvmem",
320 	{ .compatible = "allwinner,sun50i-h6" },
321 	{ .compatible = "allwinner,sun50i-a100" },
322 	{ .compatible = "allwinner,sun50i-h616" },
323 	{ .compatible = "allwinner,sun50i-h618" },
324 	{ .compatible = "allwinner,sun50i-h700" },
348 		return -ENODEV;  in sun50i_cpufreq_init()
355 		platform_device_register_simple("sun50i-cpufreq-nvmem",  in sun50i_cpufreq_init()
356 						-1, NULL, 0);  in sun50i_cpufreq_init()
373 MODULE_DESCRIPTION("Sun50i-h6 cpufreq driver");