of_find_spi_controller_by_node
EXPORT_SYMBOL_GPL(of_find_spi_controller_by_node);
ctlr = of_find_spi_controller_by_node(rd->dn->parent);
extern struct spi_controller *of_find_spi_controller_by_node(struct device_node *node);
ctlr = of_find_spi_controller_by_node(spi_np);