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",
57 	drv->driver.bus = &nvmem_layout_bus_type;  in nvmem_layout_driver_register()
59 	return driver_register(&drv->driver);  in nvmem_layout_driver_register()
65 	driver_unregister(&drv->driver);  in nvmem_layout_driver_unregister()
71 	struct nvmem_layout *layout = to_nvmem_layout_device(dev);  in nvmem_layout_release_device()  local
73 	of_node_put(layout->dev.of_node);  in nvmem_layout_release_device()
74 	kfree(layout);  in nvmem_layout_release_device()
80 	struct nvmem_layout *layout;  in nvmem_layout_create_device()  local
84 	layout = kzalloc(sizeof(*layout), GFP_KERNEL);  in nvmem_layout_create_device()
85 	if (!layout)  in nvmem_layout_create_device()
86 		return -ENOMEM;  in nvmem_layout_create_device()
89 	layout->nvmem = nvmem;  in nvmem_layout_create_device()
90 	nvmem->layout = layout;  in nvmem_layout_create_device()
93 	dev = &layout->dev;  in nvmem_layout_create_device()
95 	dev->parent = &nvmem->dev;  in nvmem_layout_create_device()
96 	dev->bus = &nvmem_layout_bus_type;  in nvmem_layout_create_device()
97 	dev->release = nvmem_layout_release_device;  in nvmem_layout_create_device()
98 	dev->coherent_dma_mask = DMA_BIT_MASK(32);  in nvmem_layout_create_device()
99 	dev->dma_mask = &dev->coherent_dma_mask;  in nvmem_layout_create_device()
102 	of_msi_configure(dev, dev->of_node);  in nvmem_layout_create_device()
114 	{ .compatible = "fixed-layout", },
125 		pr_debug("%s() - skipping %pOF, no compatible prop\n",  in nvmem_layout_bus_populate()
130 	/* Fixed layouts are parsed manually somewhere else for now */  in nvmem_layout_bus_populate()
132 		pr_debug("%s() - skipping %pOF node\n", __func__, layout_dn);  in nvmem_layout_bus_populate()
137 		pr_debug("%s() - skipping %pOF, already populated\n",  in nvmem_layout_bus_populate()
143 	/* NVMEM layout buses expect only a single device representing the layout */  in nvmem_layout_bus_populate()
155 	return of_get_child_by_name(nvmem->dev.of_node, "nvmem-layout");  in of_nvmem_layout_get_container()
172 	/* Populate the layout device */  in nvmem_populate_layout()
185 	if (!nvmem->layout)  in nvmem_destroy_layout()
188 	dev = &nvmem->layout->dev;  in nvmem_destroy_layout()
189 	of_node_clear_flag(dev->of_node, OF_POPULATED_BUS);  in nvmem_destroy_layout()