Re: [PATCH v3 00/12] fw_devlink improvements

From: Vladimir Oltean <vladimir.oltean@nxp.com>
To: Saravana Kannan <saravanak@google.com>
Cc: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Rafael J. Wysocki" <rafael@kernel.org>,
	"Sudeep Holla" <sudeep.holla@arm.com>,
	"Cristian Marussi" <cristian.marussi@arm.com>,
	"Linus Walleij" <linus.walleij@linaro.org>,
	"Bartosz Golaszewski" <brgl@bgdev.pl>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Marc Zyngier" <maz@kernel.org>,
	"Shawn Guo" <shawnguo@kernel.org>,
	"Sascha Hauer" <s.hauer@pengutronix.de>,
	"Pengutronix Kernel Team" <kernel@pengutronix.de>,
	"Fabio Estevam" <festevam@gmail.com>,
	"NXP Linux Team" <linux-imx@nxp.com>,
	"Miquel Raynal" <miquel.raynal@bootlin.com>,
	"Richard Weinberger" <richard@nod.at>,
	"Vignesh Raghavendra" <vigneshr@ti.com>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Frank Rowand" <frowand.list@gmail.com>,
	"Geert Uytterhoeven" <geert+renesas@glider.be>,
	"Magnus Damm" <magnus.damm@gmail.com>,
	"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
	"Daniel Scally" <djrscally@gmail.com>,
	"Heikki Krogerus" <heikki.krogerus@linux.intel.com>,
	"Sakari Ailus" <sakari.ailus@linux.intel.com>,
	"Len Brown" <lenb@kernel.org>, "Rafał Miłecki" <rafal@milecki.pl>,
	"Abel Vesa" <abel.vesa@linaro.org>,
	"Alexander Stein" <alexander.stein@ew.tq-group.com>,
	"Tony Lindgren" <tony@atomide.com>,
	"Geert Uytterhoeven" <geert@linux-m68k.org>,
	"John Stultz" <jstultz@google.com>,
	"Doug Anderson" <dianders@chromium.org>,
	"Guenter Roeck" <linux@roeck-us.net>,
	"Dmitry Baryshkov" <dmitry.baryshkov@linaro.org>,
	"Maxim Kiselev" <bigunclemax@gmail.com>,
	"Maxim Kochetkov" <fido_max@inbox.ru>,
	"Luca Weiss" <luca.weiss@fairphone.com>,
	"Colin Foster" <colin.foster@in-advantage.com>,
	"Martin Kepplinger" <martin.kepplinger@puri.sm>,
	"Jean-Philippe Brucker" <jpb@kernel.org>,
	kernel-team@android.com, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org,
	linux-mtd@lists.infradead.org, devicetree@vger.kernel.org,
	linux-renesas-soc@vger.kernel.org, linux-acpi@vger.kernel.org
Subject: Re: [PATCH v3 00/12] fw_devlink improvements
Date: Fri, 10 Feb 2023 12:13:33 +0200	[thread overview]
Message-ID: <20230210101333.h2e7hcl3ylsoh6fy@skbuf> (raw)
In-Reply-To: <20230207014207.1678715-1-saravanak@google.com>

Hi Saravana,

On Mon, Feb 06, 2023 at 05:41:52PM -0800, Saravana Kannan wrote:
> Vladimir,
> 
> Ccing you because DSA's and fw_devlink have known/existing problems
> (still in my TODOs to fix). But I want to make sure this series doesn't
> cause additional problems for DSA.
> 
> All,
> 
> This patch series improves fw_devlink in the following ways:
> 
> 1. It no longer cares about a fwnode having a "compatible" property. It
>    figures this out more dynamically. The only expectation is that
>    fwnodes that are converted to devices actually get probed by a driver
>    for the dependencies to be enforced correctly.
> 
> 2. Finer grained dependency tracking. fw_devlink will now create device
>    links from the consumer to the actual resource's device (if it has one,
>    Eg: gpio_device) instead of the parent supplier device. This improves
>    things like async suspend/resume ordering, potentially remove the need
>    for frameworks to create device links, more parallelized async probing,
>    and better sync_state() tracking.
> 
> 3. Handle hardware/software quirks where a child firmware node gets
>    populated as a device before its parent firmware node AND actually
>    supplies a non-optional resource to the parent firmware node's
>    device.
> 
> 4. Way more robust at cycle handling (see patch for the insane cases).
> 
> 5. Stops depending on OF_POPULATED to figure out some corner cases.
> 
> 6. Simplifies the work that needs to be done by the firmware specific
>    code.
> 
> The v3 series has gone through my usual testing on my end and looks good
> to me.

Booted on an NXP LS1028A (arch/arm64/boot/dts/freescale/fsl-ls1028a-rdb.dts)
and a Turris MOX (arch/arm64/boot/dts/marvell/armada-3720-turris-mox.dts)
with no observed regressions. Is there something specific you would like
me to test?

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