1. 查看 PCA9555 内核打印信息,如下所示 [ 0.793534] rk808-rtc rk808-rtc: device is disabled [ 0.793558] rk808-rtc: probe of rk808-rtc failed with error -22 [ 0.794717] pca953x 1-0021: 1-0021 supply vcc not found, using dummy regulator [ 0.794803] pca953x 1-0021: Linked as a consumer to regulator.0 [ 0.795453] pca9555 init success! [ 0.795603] pca953x 1-0022: 1-0022 supply vcc not found, using dummy regulator [ 0.795656] pca953x 1-0022: Linked as a consumer to regulator.0 [ 0.796284] pca9555 init success! [ 0.796894] pca953x 3-0021: 3-0021 supply vcc not found, using dummy regulator [ 0.796952] pca953x 3-0021: Linked as a consumer to regulator.0 [ 0.797589] pca9555 init success! [ 0.797732] pca953x 3-0022: 3-0022 supply vcc not found, using dummy regulator [ 0.797778] pca953x 3-0022: Linked as a consumer to regulator.0 [ 0.798407] pca9555 init success! [ 0.798544] pca953x 3-0024: 3-0024 supply vcc not found, using dummy regulator [ 0.798601] pca953x 3-0024: Linked as a consumer to regulator.0 [ 0.799223] pca9555 init success! 2. 查看内核 GPIO 口,如下图 3. 使用I2CTool 能够正常控制PCA9555 IO 口。 4. 发现注册在 I2C3 的 PCA9555 驱动。无法正常申请GPIO :/sys/class/gpio # echo 600 > export 1 该问题如何解决,谢谢。 |
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