1 // SPDX-License-Identifier: GPL-2.0
3  * NVMEM layout bus handling
10 #include <linux/dma-mapping.h>
11 #include <linux/nvmem-consumer.h>
12 #include <linux/nvmem-provider.h>
31 	struct nvmem_layout_driver *drv = to_nvmem_layout_driver(dev->driver);  in nvmem_layout_bus_probe()
32 	struct nvmem_layout *layout = to_nvmem_layout_device(dev);  in nvmem_layout_bus_probe()  local
34 	if (!drv->probe || !drv->remove)  in nvmem_layout_bus_probe()
35 		return -EINVAL;  in nvmem_layout_bus_probe()
37 	return drv->probe(layout);  in nvmem_layout_bus_probe()
42 	struct nvmem_layout_driver *drv = to_nvmem_layout_driver(dev->driver);  in nvmem_layout_bus_remove()
43 	struct nvmem_layout *layout = to_nvmem_layout_device(dev);  in nvmem_layout_bus_remove()  local
45 	return drv->remove(layout);  in nvmem_layout_bus_remove()
49 	.name		= "nvmem-layout",
58 	drv->driver.bus = &nvmem_layout_bus_type;  in __nvmem_layout_driver_register()
59 	drv->driver.owner = owner;  in __nvmem_layout_driver_register()
61 	return driver_register(&drv->driver);  in __nvmem_layout_driver_register()
67 	driver_unregister(&drv->driver);  in nvmem_layout_driver_unregister()
73 	struct nvmem_layout *layout = to_nvmem_layout_device(dev);  in nvmem_layout_release_device()  local
75 	of_node_put(layout->dev.of_node);  in nvmem_layout_release_device()
76 	kfree(layout);  in nvmem_layout_release_device()
79 static int nvmem_layout_create_device(struct nvmem_device *nvmem,  in nvmem_layout_create_device()  argument
82 	struct nvmem_layout *layout;  in nvmem_layout_create_device()  local
86 	layout = kzalloc(sizeof(*layout), GFP_KERNEL);  in nvmem_layout_create_device()
87 	if (!layout)  in nvmem_layout_create_device()
88 		return -ENOMEM;  in nvmem_layout_create_device()
91 	layout->nvmem = nvmem;  in nvmem_layout_create_device()
92 	nvmem->layout = layout;  in nvmem_layout_create_device()
95 	dev = &layout->dev;  in nvmem_layout_create_device()
97 	dev->parent = &nvmem->dev;  in nvmem_layout_create_device()
98 	dev->bus = &nvmem_layout_bus_type;  in nvmem_layout_create_device()
99 	dev->release = nvmem_layout_release_device;  in nvmem_layout_create_device()
100 	dev->coherent_dma_mask = DMA_BIT_MASK(32);  in nvmem_layout_create_device()
101 	dev->dma_mask = &dev->coherent_dma_mask;  in nvmem_layout_create_device()
104 	of_msi_configure(dev, dev->of_node);  in nvmem_layout_create_device()
116 	{ .compatible = "fixed-layout", },
120 static int nvmem_layout_bus_populate(struct nvmem_device *nvmem,  in nvmem_layout_bus_populate()  argument
127 		pr_debug("%s() - skipping %pOF, no compatible prop\n",  in nvmem_layout_bus_populate()
134 		pr_debug("%s() - skipping %pOF node\n", __func__, layout_dn);  in nvmem_layout_bus_populate()
139 		pr_debug("%s() - skipping %pOF, already populated\n",  in nvmem_layout_bus_populate()
145 	/* NVMEM layout buses expect only a single device representing the layout */  in nvmem_layout_bus_populate()
146 	ret = nvmem_layout_create_device(nvmem, layout_dn);  in nvmem_layout_bus_populate()
155 struct device_node *of_nvmem_layout_get_container(struct nvmem_device *nvmem)  in of_nvmem_layout_get_container()  argument
157 	return of_get_child_by_name(nvmem->dev.of_node, "nvmem-layout");  in of_nvmem_layout_get_container()
163  * for this nvmem device, an error code otherwise.
165 int nvmem_populate_layout(struct nvmem_device *nvmem)  in nvmem_populate_layout()  argument
170 	layout_dn = of_nvmem_layout_get_container(nvmem);  in nvmem_populate_layout()
174 	/* Populate the layout device */  in nvmem_populate_layout()
176 	ret = nvmem_layout_bus_populate(nvmem, layout_dn);  in nvmem_populate_layout()
183 void nvmem_destroy_layout(struct nvmem_device *nvmem)  in nvmem_destroy_layout()  argument
187 	if (!nvmem->layout)  in nvmem_destroy_layout()
190 	dev = &nvmem->layout->dev;  in nvmem_destroy_layout()
191 	of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);  in nvmem_destroy_layout()