linux-kernel - Re: [RFC PATCH] of: device: Support 2nd sources of probeable but undiscoverable devices

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Message-ID: <785c1e6e-8d6c-49fa-b9eb-a58e4e6cf435@sirena.org.uk>
Date:   Fri, 22 Sep 2023 20:28:21 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Doug Anderson <dianders@...omium.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Chen-Yu Tsai <wenst@...omium.org>, linux-input@...r.kernel.org,
        Jiri Kosina <jikos@...nel.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>, linux-gpio@...r.kernel.org,
        linus.walleij@...aro.org,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Johan Hovold <johan+linaro@...nel.org>,
        andriy.shevchenko@...ux.intel.com, frowand.list@...il.com,
        gregkh@...uxfoundation.org, hdegoede@...hat.com,
        james.clark@....com, james@...iv.tech, keescook@...omium.org,
        linux-kernel@...r.kernel.org, rafael@...nel.org, tglx@...utronix.de
Subject: Re: [RFC PATCH] of: device: Support 2nd sources of probeable but
 undiscoverable devices

On Fri, Sep 22, 2023 at 02:08:08PM -0500, Rob Herring wrote:

> You could always make the driver probe smarter where if your supply
> was already powered on, then don't delay. Then something else could
> ensure that the supply is enabled. I'm not sure if regulators have the
> same issue as clocks where the clock might be on from the bootloader,
> then a failed probe which gets then puts the clock turns it off.

That'll happen.

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