linux-kernel - Re: [PATCHv2] regulator: pwm-regulator: Make use of the helper function dev_err

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Date:   Tue, 21 Sep 2021 07:34:06 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Anand Moon <linux.amoon@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jon Hunter <jonathanh@...dia.com>
Subject: Re: [PATCHv2] regulator: pwm-regulator: Make use of the helper
 function dev_err_probe()

Hi Anand,

On Mon, Sep 20, 2021 at 10:38 PM Anand Moon <linux.amoon@...il.com> wrote:
>
> devm_pwm_get() can return -EPROBE_DEFER if the pwm regulator is not
> ready yet. Use dev_err_probe() for pwm regulator resources
> to indicate the deferral reason when waiting for the
> resource to come up.
>
> Fixes: 0cd71b9a43ad ("regulator: pwm: Don't warn on probe deferral")
Personally I consider this as an improvement (having the deferral
reason show up in debugfs), not a bugfix.
Because of that I would drop the Fixes tag.
Let's wait on other people's opinions though.

[...]
> -                       dev_err(&pdev->dev, "Failed to get PWM: %d\n", ret);
> -               return ret;
> +               return dev_err_probe(&pdev->dev, PTR_ERR(drvdata->pwm),
> +                                    "Failed to register regulator %s\n",
The message here should still be similar to the original one since the
actual problem is that we could not get a reference to the PWM
controller. At this point we are not trying to register the
pwm-regulator yet.


Best regards,
Martin