linux-kernel - Re: [PATCH v3 02/11] i2c: acpi: Use acpi_dev_ready_for

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Date:   Mon, 11 Oct 2021 07:50:16 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Mark Gross <markgross@...nel.org>,
        Andy Shevchenko <andy@...radead.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, Len Brown <lenb@...nel.org>,
        linux-acpi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Kate Hsuan <hpa@...hat.com>, linux-media@...r.kernel.org,
        linux-clk@...r.kernel.org
Subject: Re: [PATCH v3 02/11] i2c: acpi: Use acpi_dev_ready_for_enumeration()
 helper

On Sun, Oct 10, 2021 at 08:56:58PM +0200, Hans de Goede wrote:
> The clk and regulator frameworks expect clk/regulator consumer-devices
> to have info about the consumed clks/regulators described in the device's
> fw_node.
> 
> To work around cases where this info is not present in the firmware tables,
> which is often the case on x86/ACPI devices, both frameworks allow the
> provider-driver to attach info about consumers to the clks/regulators
> when registering these.
> 
> This causes problems with the probe ordering wrt drivers for consumers
> of these clks/regulators. Since the lookups are only registered when the
> provider-driver binds, trying to get these clks/regulators before then
> results in a -ENOENT error for clks and a dummy regulator for regulators.
> 
> To ensure the correct probe-ordering the ACPI core has code to defer the
> enumeration of consumers affected by this until the providers are ready.
> 
> Call the new acpi_dev_ready_for_enumeration() helper to avoid
> enumerating / instantiating i2c-clients too early.
> 
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>

If the ACPI and I2C-ACPI maintainers are happy, I am fine with this,
too:

Acked-by: Wolfram Sang <wsa@...nel.org>


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