pca953x: Probing too early

[Fabio Estevam]

Hi Russell,

On Tue, Aug 20, 2024 at 7:22 PM Russell King (Oracle)
<linux at armlinux.org.uk> wrote:

> This is where:
>
>         ret = regmap_bulk_write(chip->regmap, regaddr, value, NBANK(chip));
>         if (ret < 0) {
>                 dev_err(&chip->client->dev, "failed writing register\n");

Yes, correct. This is where -EAGAIN is coming from:

[    1.745657] pca953x 2-0020: supply vcc not found, using dummy regulator
[    1.752502] pca953x 2-0020: using no AI
[    1.756579] pca953x 2-0020: **** failed writing register: -11
[    1.762510] pca953x: probe of 2-0020 failed with error -11
[    1.768298] i2c i2c-2: IMX I2C adapter registered

The pca953x driver tries to write to the i2c-2 bus before i2c-2 is registered.

This is the point I don't understand: how can the pca953x driver get
probed before its I2C bus parent?

Thanks