客户端使用pinctrl子系统过程分析

涉及到的数据结构如下：

函数调用过程

really_probe
pinctrl_bind_pins
dev->pins = devm_kzalloc(dev, sizeof(*(dev->pins)), GFP_KERNEL);

    dev->pins->p = devm_pinctrl_get(dev);
                        pinctrl_get
                            create_pinctrl(dev);
                                ret = pinctrl_dt_to_map(p);

                                for_each_maps(maps_node, i, map) {
                                    ret = add_setting(p, map);
                                }

    dev->pins->default_state = pinctrl_lookup_state(dev->pins->p,
                PINCTRL_STATE_DEFAULT);         

将节点转化为map再将map转化为setting

现在来研究pinctrl_dt_to_map