1 /* 2 * Copyright (c) 2016, Linaro Limited 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, 12 * this list of conditions and the following disclaimer in the documentation 13 * and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef KERNEL_DT_H 29 #define KERNEL_DT_H 30 31 #include <compiler.h> 32 #include <stdint.h> 33 #include <types_ext.h> 34 35 #if defined(CFG_DT) 36 37 /* 38 * DT-aware drivers 39 */ 40 41 struct dt_device_match { 42 const char *compatible; 43 }; 44 45 struct dt_driver { 46 const char *name; 47 const struct dt_device_match *match_table; /* null-terminated */ 48 const void *driver; 49 }; 50 51 #define __dt_driver __section(".rodata.dtdrv") 52 53 extern const struct dt_driver __rodata_dtdrv_start, __rodata_dtdrv_end; 54 55 /* 56 * Find a driver that is suitable for the given DT node, that is, with 57 * a matching "compatible" property. 58 * 59 * @fdt: pointer to the device tree 60 * @offs: node offset 61 */ 62 const struct dt_driver *dt_find_compatible_driver(const void *fdt, int offs); 63 64 const struct dt_driver *__dt_driver_start(void); 65 66 const struct dt_driver *__dt_driver_end(void); 67 68 #else 69 70 static inline const struct dt_driver *__dt_driver_start(void) 71 { 72 return NULL; 73 } 74 75 static inline const struct dt_driver *__dt_driver_end(void) 76 { 77 return NULL; 78 } 79 80 static inline const struct dt_driver *dt_find_compatible_driver( 81 const void *fdt __unused, 82 int offs __unused) 83 { 84 return NULL; 85 } 86 87 #endif /* !CFG_DT */ 88 89 #define for_each_dt_driver(drv) \ 90 for (drv = __dt_driver_start(); drv < __dt_driver_end(); drv++) 91 92 #endif /* KERNEL_DT_H */ 93