drivers/cpufreq/sun50i-cpufreq-nvmem.c

1 // SPDX-License-Identifier: GPL-2.0
3  * Allwinner CPUFreq nvmem based driver
5  * The sun50i-cpufreq-nvmem driver reads the efuse value from the SoC to
15 #include <linux/nvmem-consumer.h>
29  * sun50i_cpufreq_get_efuse() - Determine speed grade from efuse value
45 		return -ENODEV;  in sun50i_cpufreq_get_efuse()
49 		return -ENOENT;  in sun50i_cpufreq_get_efuse()
52 				      "allwinner,sun50i-h6-operating-points");  in sun50i_cpufreq_get_efuse()
55 		return -ENOENT;  in sun50i_cpufreq_get_efuse()
62 				     "Could not get nvmem cell\n");  in sun50i_cpufreq_get_efuse()
73 	 * the slowest bin. Expected efuse values are 1-3, slowest  in sun50i_cpufreq_get_efuse()
77 		*versions = efuse_value - 1;  in sun50i_cpufreq_get_efuse()
96 		return -ENOMEM;  in sun50i_cpufreq_nvmem_probe()
110 			ret = -ENODEV;  in sun50i_cpufreq_nvmem_probe()
122 	cpufreq_dt_pdev = platform_device_register_simple("cpufreq-dt", -1,  in sun50i_cpufreq_nvmem_probe()
157 		.name = "sun50i-cpufreq-nvmem",
162 	{ .compatible = "allwinner,sun50i-h6" },
180  * Since the driver depends on nvmem drivers, which may return EPROBE_DEFER,
191 		return -ENODEV;  in sun50i_cpufreq_init()
198 		platform_device_register_simple("sun50i-cpufreq-nvmem",  in sun50i_cpufreq_init()
199 						-1, NULL, 0);  in sun50i_cpufreq_init()
216 MODULE_DESCRIPTION("Sun50i-h6 cpufreq driver");