Function dt_update_cells

util/cbmem/devmem_drv.c:243–280

#if defined(__arm__) || defined(__aarch64__)
static void dt_update_cells(const char *name, int *addr_cells_ptr, int *size_cells_ptr)
{
	if (*addr_cells_ptr >= 0 && *size_cells_ptr >= 0)
		return;

	int buffer;
	size_t nlen = strlen(name);
	char *prop = alloca(nlen + sizeof("/#address-cells"));
	strcpy(prop, name);

	if (*addr_cells_ptr < 0) {
		strcpy(prop + nlen, "/#address-cells");
		int fd = open(prop, O_RDONLY);
		if (fd < 0 && errno != ENOENT) {
			perror(prop);
		} else if (fd >= 0) {
			if (read(fd, &buffer, sizeof(int)) < 0)
				perror(prop);
			else
				*addr_cells_ptr = ntohl(buffer);
			close(fd);
		}
	}

	if (*size_cells_ptr < 0) {
		strcpy(prop + nlen, "/#size-cells");
		int fd = open(prop, O_RDONLY);
		if (fd < 0 && errno != ENOENT) {
			perror(prop);
		} else if (fd >= 0) {
			if (read(fd, &buffer, sizeof(int)) < 0)
				perror(prop);
			else
				*size_cells_ptr = ntohl(buffer);
			close(fd);
		}
	}
}

static char *dt_find_compat(const char *parent, const char *compat, int *addr_cells_ptr,
			    int *size_cells_ptr)