linux 内核regulator

问题

在sys文件系统下没有生成cpu 调频的相关节点。

日志对比

[    3.588745] cpu cpu4: Looking up cpu-supply from device tree
[    3.588753] cpu cpu4: Failed to get reg
[    3.588791] cpu cpu4: Looking up cpu-supply from device tree
[    3.588808] Failed to initialize dvfs info cpu4

代码流程

cpufreq

kernel\drivers\soc\rockchip\rockchip_opp_select.c

static int rockchip_get_pvtm_pvtpll(struct device *dev, struct device_node *np,char *reg_name)
{struct regulator *reg;struct clk *clk;struct pvtm_config *pvtm;unsigned long old_freq;unsigned int old_volt;int cur_temp, diff_temp, prop_temp, diff_value;int pvtm_value = 0;int ret = 0;pvtm = kzalloc(sizeof(*pvtm), GFP_KERNEL);if (!pvtm)return -ENOMEM;ret = rockchip_parse_pvtm_config(np, pvtm);if (ret)goto out;clk = clk_get(dev, NULL);if (IS_ERR_OR_NULL(clk)) {dev_warn(dev, "Failed to get clk\n");goto out;}//如下这行打印出的失败信息reg = regulator_get_optional(dev, reg_name);if (IS_ERR_OR_NULL(reg)) {dev_warn(dev, "Failed to get reg\n");clk_put(clk);goto out;}

I:\rk3588\kernel\drivers\cpufreq\rockchip-cpufreq.c

static int rockchip_cpufreq_cluster_init(int cpu, struct cluster_info *cluster)
{struct rockchip_opp_info *opp_info = &cluster->opp_info;struct opp_table *pname_table = NULL;struct opp_table *reg_table = NULL;if (opp_info->data && opp_info->data->get_soc_info)opp_info->data->get_soc_info(dev, np, &bin, &process);rockchip_get_scale_volt_sel(dev, "cpu_leakage", reg_name, bin, process,&cluster->scale, &volt_sel); //入口函数

static int __init rockchip_cpufreq_driver_init(void)
{struct cluster_info *cluster, *pos;struct cpufreq_dt_platform_data pdata = {0};int cpu, ret;for_each_possible_cpu(cpu) {cluster = rockchip_cluster_info_lookup(cpu);if (cluster)continue;cluster = kzalloc(sizeof(*cluster), GFP_KERNEL);if (!cluster) {ret = -ENOMEM;goto release_cluster_info;}ret = rockchip_cpufreq_cluster_init(cpu, cluster);if (ret) {pr_err("Failed to initialize dvfs info cpu%d\n", cpu);goto release_cluster_info;}list_add(&cluster->list_head, &cluster_info_list);}

regulator

_regulator_get

I:\rk3588\kernel\drivers\regulator\core.c

根据此函数，猜测由于regulator设备没有被发现，没有被注册到系统中，导致cpufreq没有找到相应的regulator节点。

rk806

I:\rk3588\kernel\drivers\regulator\rk806-regulator.c

rk860

I:\rk3588\kernel\drivers\regulator\rk860x-regulator.c

DTS配置

&i2c0 {status = "okay";pinctrl-names = "default";pinctrl-0 = <&i2c0m2_xfer>;vdd_cpu_big0_s0: vdd_cpu_big0_mem_s0: rk8602@42 {compatible = "rockchip,rk8602";reg = <0x42>;vin-supply = <&vcc5v0_sys>;vsel-gpios = <&gpio0 RK_PA3 GPIO_ACTIVE_HIGH>;regulator-compatible = "rk860x-reg";regulator-name = "vdd_cpu_big0_s0";regulator-min-microvolt = <550000>;regulator-max-microvolt = <1050000>;regulator-ramp-delay = <2300>;rockchip,suspend-voltage-selector = <1>;regulator-boot-on;regulator-always-on;regulator-state-mem {regulator-off-in-suspend;};};

sys节点创建

rk860x_regulator_register--》devm_regulator_register->regulator_register

-->rdev_init_debugfs-->

此处没有创建设备节点，也就是前面初始化部分出现问题了。

初始化代码

/* Get chip ID */ret = regmap_read(di->regmap, RK860X_ID1, &val);if (ret < 0) {dev_err(&client->dev, "Failed to get chip ID!\n");return ret;}switch (di->chip_id) {case RK860X_CHIP_ID_00:case RK860X_CHIP_ID_01:if ((val & DIE_ID) != 0x8) {dev_err(&client->dev, "Failed to match chip ID!\n");return -EINVAL;}break;case RK860X_CHIP_ID_02:case RK860X_CHIP_ID_03:if ((val & DIE_ID) != 0xa) {dev_err(&client->dev, "Failed to match chip ID!\n");return -EINVAL;}break;default:return -EINVAL;}/* Device init */ret = rk860x_device_setup(di, pdata);if (ret < 0) {dev_err(&client->dev, "Failed to setup device!\n");return ret;}/* Register regulator */config.dev = di->dev;config.init_data = di->regulator;config.regmap = di->regmap;config.driver_data = di;config.of_node = np;ret = rk860x_regulator_register(di, &config);if (ret < 0)dev_err(&client->dev, "Failed to register regulator!\n");

回看dmesg日志

[    3.509295] i2c /dev entries driver
[    3.510437] rk860-regulator 0-0042: Failed to match chip ID!
[    3.510478] rk860-regulator: probe of 0-0042 failed with error -22
[    3.511089] rk860-regulator 0-0043: Failed to match chip ID!
[    3.511120] rk860-regulator: probe of 0-0043 failed with error -22
[    3.514659] rk860-regulator 1-0042: Looking up vin-supply from device tree

对比正常日志

也就是从I2C读取的ID 信息不对。

读取偏移量为0x3

sys文件系统调试信息

regulator summary

查看只有 vdd_cpu_lit_s0 没有两个大核的信息，可以确认两个大核对应的regulator没有生成。

cat /sys/kernel/debug/regulator/regulator_summaryregulator                      use open bypass  opmode voltage current     min     max
---------------------------------------------------------------------------------------regulator-dummy                  4    4      0 unknown     0mV     0mA     0mV     0mVfe210000.sata-target          1                                 0mA     0mV     0mVfe210000.sata-phy             1                                 0mA     0mV     0mVfe210000.sata-ahci            1                                 0mA     0mV     0mVregulator-dummy               0                                 0mA     0mV     0mVvcc12v_dcin                      3    3      0 unknown 12000mV     0mA 12000mV 12000mVvcc12v_dcin                   0                                 0mA     0mV     0mVvcc5v0_sys                   16   16      0 unknown  5000mV     0mA  5000mV  5000mVvcc5v0_sys                 0                                 0mA     0mV     0mVvcc_1v1_nldo_s3            6    6      0 unknown  1100mV     0mA  1100mV  1100mVvcc_1v1_nldo_s3         0                                 0mA     0mV     0mVvdd_0v75_s3             1    1      0 unknown   750mV     0mA   750mV   750mVvdd_0v75_s3          0                                 0mA     0mV     0mVvdd_ddr_pll_s0          1    1      0 unknown   850mV     0mA   850mV   850mVvdd_ddr_pll_s0       0                                 0mA     0mV     0mVavdd_0v75_s0            2    2      0 unknown   750mV     0mA   750mV   750mVavdd_0v75_s0         0                                 0mA     0mV     0mVpcie30_avdd0v75      1    1      0 unknown   750mV     0mA   750mV   750mVpcie30_avdd0v75   0                                 0mA     0mV     0mVvdd_0v85_s0             2    2      0 unknown   850mV     0mA   850mV   850mVvdd_0v85_s0          0                                 0mA     0mV     0mVpcie20_avdd0v85      1    1      0 unknown   850mV     0mA   850mV   850mVpcie20_avdd0v85   0                                 0mA     0mV     0mVvdd_0v75_s0             1    1      0 unknown   750mV     0mA   750mV   750mVvdd_0v75_s0          0                                 0mA     0mV     0mVvdd_gpu_s0                 0    5      0  normal   675mV     0mA   550mV   950mVfb000000.gpu-mem        0                                 0mA   675mV   950mVfb000000.gpu-mali       0                                 0mA   675mV   950mVfb000000.gpu-mem        0                                 0mA     0mV     0mVfb000000.gpu-mali       0                                 0mA     0mV     0mVvdd_gpu_s0              0                                 0mA     0mV     0mVvdd_cpu_lit_s0             1    3      0  normal   750mV     0mA   550mV   950mVcpu0-mem                0                                 0mA     0mV     0mVcpu0-cpu                0                                 0mA     0mV     0mVvdd_cpu_lit_s0          0                                 0mA     0mV     0mVvdd_log_s0                 1    1      0  normal   750mV     0mA   675mV   750mVvdd_log_s0              0                                 0mA     0mV     0mVvdd_vdenc_s0               1    1      0  normal   750mV     0mA   550mV   950mVvdd_vdenc_s0            0                                 0mA     0mV     0mVvdd_ddr_s0                 1    1      0  normal   850mV     0mA   675mV   900mVvdd_ddr_s0              0                                 0mA     0mV     0mVvdd2_ddr_s3                1    1      0  normal   500mV     0mA     0mV     0mVvdd2_ddr_s3             0                                 0mA     0mV     0mVvdd_2v0_pldo_s3            4    4      0  normal  2000mV     0mA  2000mV  2000mVvdd_2v0_pldo_s3         0                                 0mA     0mV     0mVavcc_1v8_s0             3    3      0 unknown  1800mV     0mA  1800mV  1800mVavcc_1v8_s0          0                                 0mA     0mV     0mVpcie30_avdd1v8       1    1      0 unknown  1800mV     0mA  1800mV  1800mVpcie30_avdd1v8    0                                 0mA     0mV     0mVpcie20_avdd1v8       1    1      0 unknown  1800mV     0mA  1800mV  1800mVpcie20_avdd1v8    0                                 0mA     0mV     0mVvcc_1v8_s0              2    2      0 unknown  1800mV     0mA  1800mV  1800mVfec10000.saradc-vref   1                                 0mA     0mV     0mVvcc_1v8_s0           0                                 0mA     0mV     0mVavdd_1v2_s0             1    1      0 unknown  1200mV     0mA  1200mV  1200mVavdd_1v2_s0          0                                 0mA     0mV     0mVvcc_3v3_s3                 1    1      0  normal  3300mV     0mA  3300mV  3300mVvcc_3v3_s3              0                                 0mA     0mV     0mVvddq_ddr_s0                1    1      0  normal   500mV     0mA     0mV     0mVvddq_ddr_s0             0                                 0mA     0mV     0mVvcc_1v8_s3                 1    1      0  normal  1800mV     0mA  1800mV  1800mVvcc_1v8_s3              0                                 0mA     0mV     0mVvcc_3v3_s0                 1    1      0 unknown  3300mV     0mA  3300mV  3300mVvcc_3v3_s0              0                                 0mA     0mV     0mVvccio_sd_s0                1    1      0 unknown  3300mV     0mA  1800mV  3300mVvccio_sd_s0             0                                 0mA     0mV     0mVpldo6_s3                   1    1      0 unknown  1800mV     0mA  1800mV  1800mVpldo6_s3                0                                 0mA     0mV     0mVvdd_npu_s0                 1    5      0  normal   825mV     0mA   550mV   950mVfdab0000.npu-mem        0                                 0mA   825mV   950mVfdab0000.npu-rknpu      0                                 0mA   825mV   950mVfdab0000.npu-mem        0                                 0mA     0mV     0mVfdab0000.npu-rknpu      0                                 0mA     0mV     0mVvdd_npu_s0              0                                 0mA     0mV     0mVvcc5v0_usbdcin                2    2      0 unknown  5000mV     0mA  5000mV  5000mVvcc5v0_usbdcin             0                                 0mA     0mV     0mVvcc5v0_usb                 1    2      0 unknown  5000mV     0mA  5000mV  5000mVvcc5v0_usb              0                                 0mA     0mV     0mVvbus5v0_typec           0    2      0 unknown  5000mV     0mA  5000mV  5000mV6-0022-vbus          0                                 0mA     0mV     0mVvbus5v0_typec        0                                 0mA     0mV     0mV