问题描述
pinctrl设置引脚复用失败，没有调用到controller中的set_groups_function函数。
问题定位
- pinctrl如何注册dm节点
- 如何进行设备树中各个设备节点下的复用配置
- 为什么没调用到控制器实现的set_groups_function函数
&gpio0 {status = "okay";pinctrl-names = "default";pinctrl-0 = <&gpioa15_pinctrl>;
};&pinctrl {gpioa15 {gpioa15_pinctrl: gpioa15_grp {ts,pins = <PB7>;mux,val = <5>;function = "gpioa15";groups = "gpioa15_grp";};};
};
pinctrl如何注册dm节点
调用过程：
[uboot/drivers/core/device.c]
int device_probe(struct udevice *dev)/* Process pinctrl for everything except the root device, and* continue regardless of the result of pinctrl. Don't process pinctrl* settings for pinctrl devices since the device may not yet be* probed. * */pinctrl_select_state(dev, "default");pinctrl_select_state_simple(dev);/** Try full-implemented pinctrl first.* If it fails or is not implemented, try simple one.*/if (pinctrl_select_state_full(dev, statename))return pinctrl_select_state_simple(dev);UCLASS_DRIVER(pinctrl) = {.id = UCLASS_PINCTRL,.post_bind = pinctrl_post_bind,.flags = DM_UC_FLAG_SEQ_ALIAS,.name = "pinctrl",ret = uclass_pre_probe_device(dev);ret = uclass_post_probe_device(dev);uc_drv->post_probepinctrl_post_bindreturn pinconfig_post_bind(dev);pinctrl_select_state(dev, "default");pinctrl_select_state_full(dev, statename)ret = pinctrl_config_one(config);ops = pinctrl_get_ops(pctldev);/* this ops was set by controller */return ops->set_state(pctldev, config);};
上面的调用过程是通过加log找出来的，log如下：
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:68
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:482
__file:drivers/core/device.c __func:device_probe __line:482
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:460
__file:drivers/core/device.c __func:device_probe __line:476
__file:drivers/core/device.c __func:device_probe __line:479
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:68
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:482
initr_nand bypass
MMC: __file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:460
__file:drivers/core/device.c __func:device_probe __line:476
__file:drivers/core/device.c __func:device_probe __line:479
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:68
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:482
dev 0x00000000bf741ec0, size 0xa0, name mmc@f0512000, ofnode 10c4, mmc@f0512000
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:460
__file:drivers/core/device.c __func:device_probe __line:476
__file:drivers/core/device.c __func:device_probe __line:479
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:68
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:482
dev 0x00000000bf742260, size 0xa0, name mmc@f0513000, ofnode 1158, mmc@f0513000
__file:drivers/core/device.c __func:device_probe __line:431
看着就是在pinctrl_select_state_full 函数里出了问题：
每次进入pinctrl_select_state_full 函数只能打印到68行，下面的打印出不来，没有调到pinctrl_config_one，所以设备树里注册的gpioa15_pinctrl没有被配置。
/*** pinctrl_select_state_full() - full implementation of pinctrl_select_state** @dev: peripheral device* @statename: state name, like "default"* @return: 0 on success, or negative error code on failure*/
static int pinctrl_select_state_full(struct udevice *dev, const char *statename)
{char propname[32]; /* long enough */const fdt32_t *list;uint32_t phandle;struct udevice *config;int state, size, i, ret;printf("__file:%s __func:%s __line:%d\n", __FILE__, __func__, __LINE__);state = dev_read_stringlist_search(dev, "pinctrl-names", statename);if (state < 0) {char *end;/** If statename is not found in "pinctrl-names",* assume statename is just the integer state ID.*/state = simple_strtoul(statename, &end, 10);if (*end)return -EINVAL;}
printf("__file:%s __func:%s __line:%d\n", __FILE__, __func__, __LINE__);snprintf(propname, sizeof(propname), "pinctrl-%d", state);list = dev_read_prop(dev, propname, &size);if (!list)return -EINVAL;size /= sizeof(*list);printf("__file:%s __func:%s __line:%d size:%d\n", __FILE__, __func__, __LINE__, size);for (i = 0; i < size; i++) {phandle = fdt32_to_cpu(*list++);ret = uclass_get_device_by_phandle_id(UCLASS_PINCONFIG, phandle,&config);if (ret) {dev_warn(dev, "%s: uclass_get_device_by_phandle_id: err=%d\n",__func__, ret);continue;}
printf("__file:%s __func:%s __line:%d\n", __FILE__, __func__, __LINE__);ret = pinctrl_config_one(config);if (ret) {dev_warn(dev, "%s: pinctrl_config_one: err=%d\n",__func__, ret);continue;}}return 0;
}
初步怀疑是69行这里state = dev_read_stringlist_search(dev, "pinctrl-names", statename); 返回的state是个非法值。打印出来看看：
果然都是非法值，-61！！！
pinctrl_probe
reg_base:f0389000
npins : 78
nfuncs : 1
ngroups: 1 func:gpioa15, ngroups = 1
grp_index = 0
group[0] name gpioa15_grp
mux_val: 0x5
npins: 1
15
ts_pinctrl_parse_dt done
ts pinctrl initialized
__file:drivers/core/device.c __func:device_probe __line:523
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:68
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:70 state:-61
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:482
__file:drivers/core/device.c __func:device_probe __line:482
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:460
__file:drivers/core/device.c __func:device_probe __line:476
__file:drivers/core/device.c __func:device_probe __line:479
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:68
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:70 state:-61
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:482
initr_nand bypass
MMC: __file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:460
__file:drivers/core/device.c __func:device_probe __line:476
__file:drivers/core/device.c __func:device_probe __line:479
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:68
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:70 state:-61
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:482
dev 0x00000000bf741ec0, size 0xa0, name mmc@f0512000, ofnode 10c4, mmc@f0512000
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:460
__file:drivers/core/device.c __func:device_probe __line:476
__file:drivers/core/device.c __func:device_probe __line:479
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:68
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:70 state:-61
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:482
uboot的异常宏号码列表
uboot/include/linux/errno.h
#define EBFONT 59 /* Bad font file format */
#define ENOSTR 60 /* Device not a stream */
#define ENODATA 61 /* No data available */
dev_read_stringlist_search的定义：
static inline int dev_read_stringlist_search(const struct udevice *dev,const char *propname,const char *string)
{return ofnode_stringlist_search(dev_ofnode(dev), propname, string);
}int ofnode_stringlist_search(ofnode node, const char *property,const char *string)
{if (ofnode_is_np(node)) {//maybe bug here？return of_property_match_string(ofnode_to_np(node),property, string);} else {int ret;ret = fdt_stringlist_search(gd->fdt_blob,ofnode_to_offset(node), property,string);if (ret == -FDT_ERR_NOTFOUND)//maybe bug here？return -ENODATA;else if (ret < 0)return -EINVAL;return ret;}
}
上面注释中有两个位置可能返回了ENODATA，此处已经开始怀疑是不是设备树描述地有问题了。回头看了一下dts中，pinctrl-names属性是存在的。。。
但是dts虽然有，编译出dtb到后不一定还是存在的，这里通过请教前辈，有哪些fdt的调试手段，前辈推荐了fdt命令，在uboot中可以用于显示设备树信息：
如何使用：
- 通过printenv，找到fdtcontroladdr属性的值，此为fdt所在地址
- 运行fdt fdtcontroladdr
- 运行fdt list
找到gpio和pinctrl节点所在：
可以看到gpio及其pinctrl配置，实际已经配置进去了。
从这里开始，我就觉得不对劲了，只能开始请神了，所以我找了原先的pinctrl mantainer。原先的mantainer说：
uboot中GPIO节点的pinctrl配置，是必须在gpio命令运行完毕之后，才会进行pinctrl的配置的！
恍然大悟，之前没有注意过这个特性，我运行了gpio set 15 1后：
=> gpio set 15 1
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:460
__file:drivers/core/device.c __func:device_probe __line:476
__file:drivers/core/device.c __func:device_probe __line:479
dev->name:gpio@f0390000
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:70
fdt_stringlist_search len:8
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:72 state:0 name:default
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:83
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:90 size:1
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:460
__file:drivers/core/device.c __func:device_probe __line:476
__file:drivers/core/device.c __func:device_probe __line:479
dev->name:gpioa15
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:70
const fdt_stringlist_search == FDT_ERR_NOTFOUND
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:72 state:-61 name:default
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:482
__file:drivers/core/device.c __func:device_probe __line:460
__file:drivers/core/device.c __func:device_probe __line:476
__file:drivers/core/device.c __func:device_probe __line:479
dev->name:gpioa15_grp
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:70
const fdt_stringlist_search == FDT_ERR_NOTFOUND
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:72 state:-61 name:default
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:482
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:100
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_config_one __line:32
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_config_one __line:34
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_config_one __line:36
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_config_one __line:38
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_config_one __line:44
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_config_one __line:36
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_config_one __line:38
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_config_one __line:44
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_config_one __line:50
__func:pinctrl_generic_set_state line:340
__func:pinctrl_generic_set_state_subnode line:301
>>>get group[0] gpioa15_grp
__func:pinctrl_generic_set_state_subnode line:326
__func:pinctrl_generic_set_state_one line:250
__func:pinctrl_generic_set_state_one line:261
__func:pinmux_enable_setting line:119
set_mux, function:0, group:0
group name:gpioa15_grp, func name:gpioa15 mux_val:5
pin15, wr 0x00000000f038912c, val 0x50000000
__file:drivers/core/device.c __func:device_probe __line:482
failed to get gpio clock
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:460
__file:drivers/core/device.c __func:device_probe __line:476
__file:drivers/core/device.c __func:device_probe __line:479
dev->name:pa
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:70
const fdt_stringlist_search == FDT_ERR_NOTFOUND
__file:drivers/pinctrl/pinctrl-uclass.c __func:pinctrl_select_state_full __line:72 state:-61 name:default
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:482
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
gpio: pin 15 (gpio 15) value is 1
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
__file:drivers/core/device.c __func:device_probe __line:431
可以看到name:default已经找到了，再使用devmem查看pinctrl对应的B组寄存器值：
=> md 0xf038912c
f038912c: 50000000 00000000 00000000 00000000 ...P............
f038913c: 00000000 00000000 00000000 00000000 ................
f038914c: 00000000 00000000 00000000 00000000 ................
f038915c: 00000000 00000000 00000000 00000000 ................
f038916c: 00000000 00000000 00000000 00000000 ................
f038917c: 00000000 00000000 00000000 00000000 ................
f038918c: 00000000 00000000 00000000 00000000 ................
f038919c: 00000000 00000000 00000000 00000000 ................
f03891ac: 00000000 00000000 00000000 00000000 ................
f03891bc: 00000000 00000000 00000000 00000000 ................
f03891cc: 00000000 00000000 00000000 00000000 ................
f03891dc: 00000000 00000000 00000000 00000000 ................
f03891ec: 00000000 00000000 00000000 00000000 ................
f03891fc: 00000000 000000ff 00000000 00000000 ................
f038920c: 00000000 000000ff 00000000 00000000 ................
f038921c: 00000000 00000000 00000000 00000000 ................
=>
func5配置成功。
TODO：gpio中如何调用到pinctrl配置接口
推荐链接：
https://blog.csdn.net/ZHONGCAI0901/article/details/117986327
