1 // SPDX-License-Identifier: GPL-2.0-or-later
11 #include <linux/reboot.h>
13 #include <linux/mfd/syscon.h>
14 #include <linux/reboot-mode.h>
18 	struct reboot_mode_driver reboot;  member
23 static int syscon_reboot_mode_write(struct reboot_mode_driver *reboot,  in syscon_reboot_mode_write()  argument
29 	syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot);  in syscon_reboot_mode_write()
31 	ret = regmap_update_bits(syscon_rbm->map, syscon_rbm->offset,  in syscon_reboot_mode_write()
32 				 syscon_rbm->mask, magic);  in syscon_reboot_mode_write()
34 		dev_err(reboot->dev, "update reboot mode bits failed\n");  in syscon_reboot_mode_write()
39 static int syscon_reboot_mode_read(struct reboot_mode_driver *reboot)  in syscon_reboot_mode_read()  argument
44 	syscon_rbm = container_of(reboot, struct syscon_reboot_mode, reboot);  in syscon_reboot_mode_read()
45 	regmap_read(syscon_rbm->map, syscon_rbm->offset, &val);  in syscon_reboot_mode_read()
55 	syscon_rbm = devm_kzalloc(&pdev->dev, sizeof(*syscon_rbm), GFP_KERNEL);  in syscon_reboot_mode_probe()
57 		return -ENOMEM;  in syscon_reboot_mode_probe()
59 	syscon_rbm->reboot.dev = &pdev->dev;  in syscon_reboot_mode_probe()
60 	syscon_rbm->reboot.write = syscon_reboot_mode_write;  in syscon_reboot_mode_probe()
61 	syscon_rbm->reboot.read = syscon_reboot_mode_read;  in syscon_reboot_mode_probe()
62 	syscon_rbm->mask = 0xffffffff;  in syscon_reboot_mode_probe()
64 	syscon_rbm->map = syscon_node_to_regmap(pdev->dev.parent->of_node);  in syscon_reboot_mode_probe()
65 	if (IS_ERR(syscon_rbm->map))  in syscon_reboot_mode_probe()
66 		return PTR_ERR(syscon_rbm->map);  in syscon_reboot_mode_probe()
68 	if (of_property_read_u32(pdev->dev.of_node, "offset",  in syscon_reboot_mode_probe()
69 	    &syscon_rbm->offset))  in syscon_reboot_mode_probe()
70 		return -EINVAL;  in syscon_reboot_mode_probe()
72 	of_property_read_u32(pdev->dev.of_node, "mask", &syscon_rbm->mask);  in syscon_reboot_mode_probe()
74 	ret = devm_reboot_mode_register(&pdev->dev, &syscon_rbm->reboot);  in syscon_reboot_mode_probe()
76 		dev_err(&pdev->dev, "can't register reboot mode\n");  in syscon_reboot_mode_probe()
82 	{ .compatible = "syscon-reboot-mode" },
90 		.name = "syscon-reboot-mode",
96 MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com");
97 MODULE_DESCRIPTION("SYSCON reboot mode driver");