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(2001-14ba-437-c00--198.rev.dnainternet.fi. [2001:14ba:437:c00::198]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-596bfa48aaasm1029238e87.71.2025.11.28.00.34.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 28 Nov 2025 00:34:59 -0800 (PST) Message-ID: <55076f4b-d523-4f8c-8bd4-0645b790737e@gmail.com> Date: Fri, 28 Nov 2025 10:34:57 +0200 Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 01/29] Revert "treewide: Fix probing of devices in DT overlays" To: Rob Herring , Matti Vaittinen Cc: Herve Codina , Andrew Lunn , Krzysztof Kozlowski , Conor Dooley , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Michael Turquette , Stephen Boyd , Andi Shyti , Wolfram Sang , Peter Rosin , Arnd Bergmann , Saravana Kannan , Bjorn Helgaas , Charles Keepax , Richard Fitzgerald , David Rhodes , Linus Walleij , Ulf Hansson , Mark Brown , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Len Brown , Davidlohr Bueso , Jonathan Cameron , Dave Jiang , Alison Schofield , Vishal Verma , Ira Weiny , Dan Williams , Geert Uytterhoeven , Wolfram Sang , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, linux-i2c@vger.kernel.org, linux-pci@vger.kernel.org, linux-sound@vger.kernel.org, patches@opensource.cirrus.com, linux-gpio@vger.kernel.org, linux-pm@vger.kernel.org, linux-spi@vger.kernel.org, linux-acpi@vger.kernel.org, linux-cxl@vger.kernel.org, Allan Nielsen , Horatiu Vultur , Steen Hegelund , Luca Ceresoli , Thomas Petazzoni References: <20251015071420.1173068-1-herve.codina@bootlin.com> <20251015071420.1173068-2-herve.codina@bootlin.com> <5cf2a12a-7c66-4622-b4a9-14896c6df005@gmail.com> <072dde7c-a53c-4525-83ac-57ea38edc0b5@gmail.com> Content-Language: en-US From: Kalle Niemi In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit On 11/27/25 03:54, Rob Herring wrote: > On Tue, Nov 25, 2025 at 12:43 AM Matti Vaittinen > wrote: >> On 24/11/2025 19:01, Rob Herring wrote: >>> On Mon, Nov 24, 2025 at 10:44 AM Kalle Niemi wrote: >>>> >>>> On 11/24/25 16:53, Rob Herring wrote: >>>>> On Mon, Nov 24, 2025 at 8:48 AM Kalle Niemi wrote: >>>>>> On 10/15/25 10:13, Herve Codina wrote: >>>>>>> From: Saravana Kannan >>>>>>> >>>>>>> This reverts commit 1a50d9403fb90cbe4dea0ec9fd0351d2ecbd8924. >>>>>>> >>>>>>> While the commit fixed fw_devlink overlay handling for one case, it >>>>>>> broke it for another case. So revert it and redo the fix in a separate >>>>>>> patch. >>>>>>> >>>>>>> Fixes: 1a50d9403fb9 ("treewide: Fix probing of devices in DT overlays") >>>>>>> Reported-by: Herve Codina >>>>>>> Closes: https://lore.kernel.org/lkml/CAMuHMdXEnSD4rRJ-o90x4OprUacN_rJgyo8x6=9F9rZ+-KzjOg@mail.gmail.com/ >>>>>>> Closes: https://lore.kernel.org/all/20240221095137.616d2aaa@bootlin.com/ >>>>>>> Closes: https://lore.kernel.org/lkml/20240312151835.29ef62a0@bootlin.com/ >>>>>>> Signed-off-by: Saravana Kannan >>>>>>> Link: https://lore.kernel.org/lkml/20240411235623.1260061-2-saravanak@google.com/ >>>>>>> Signed-off-by: Herve Codina >>>>>>> Acked-by: Mark Brown >>>>>>> --- >>>>>>> drivers/bus/imx-weim.c | 6 ------ >>>>>>> drivers/i2c/i2c-core-of.c | 5 ----- >>>>>>> drivers/of/dynamic.c | 1 - >>>>>>> drivers/of/platform.c | 5 ----- >>>>>>> drivers/spi/spi.c | 5 ----- >>>>>>> 5 files changed, 22 deletions(-) >>>>>>> >>>>>>> diff --git a/drivers/bus/imx-weim.c b/drivers/bus/imx-weim.c >>>>>>> index 83d623d97f5f..87070155b057 100644 >>>>>>> --- a/drivers/bus/imx-weim.c >>>>>>> +++ b/drivers/bus/imx-weim.c >>>>>>> @@ -327,12 +327,6 @@ static int of_weim_notify(struct notifier_block *nb, unsigned long action, >>>>>>> "Failed to setup timing for '%pOF'\n", rd->dn); >>>>>>> >>>>>>> if (!of_node_check_flag(rd->dn, OF_POPULATED)) { >>>>>>> - /* >>>>>>> - * Clear the flag before adding the device so that >>>>>>> - * fw_devlink doesn't skip adding consumers to this >>>>>>> - * device. >>>>>>> - */ >>>>>>> - rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE; >>>>>>> if (!of_platform_device_create(rd->dn, NULL, &pdev->dev)) { >>>>>>> dev_err(&pdev->dev, >>>>>>> "Failed to create child device '%pOF'\n", >>>>>>> diff --git a/drivers/i2c/i2c-core-of.c b/drivers/i2c/i2c-core-of.c >>>>>>> index eb7fb202355f..30b48a428c0b 100644 >>>>>>> --- a/drivers/i2c/i2c-core-of.c >>>>>>> +++ b/drivers/i2c/i2c-core-of.c >>>>>>> @@ -176,11 +176,6 @@ static int of_i2c_notify(struct notifier_block *nb, unsigned long action, >>>>>>> return NOTIFY_OK; >>>>>>> } >>>>>>> >>>>>>> - /* >>>>>>> - * Clear the flag before adding the device so that fw_devlink >>>>>>> - * doesn't skip adding consumers to this device. >>>>>>> - */ >>>>>>> - rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE; >>>>>>> client = of_i2c_register_device(adap, rd->dn); >>>>>>> if (IS_ERR(client)) { >>>>>>> dev_err(&adap->dev, "failed to create client for '%pOF'\n", >>>>>>> diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c >>>>>>> index 2eaaddcb0ec4..b5be7484fb36 100644 >>>>>>> --- a/drivers/of/dynamic.c >>>>>>> +++ b/drivers/of/dynamic.c >>>>>>> @@ -225,7 +225,6 @@ static void __of_attach_node(struct device_node *np) >>>>>>> np->sibling = np->parent->child; >>>>>>> np->parent->child = np; >>>>>>> of_node_clear_flag(np, OF_DETACHED); >>>>>>> - np->fwnode.flags |= FWNODE_FLAG_NOT_DEVICE; >>>>>>> >>>>>>> raw_spin_unlock_irqrestore(&devtree_lock, flags); >>>>>>> >>>>>>> diff --git a/drivers/of/platform.c b/drivers/of/platform.c >>>>>>> index f77cb19973a5..ef9445ba168b 100644 >>>>>>> --- a/drivers/of/platform.c >>>>>>> +++ b/drivers/of/platform.c >>>>>>> @@ -739,11 +739,6 @@ static int of_platform_notify(struct notifier_block *nb, >>>>>>> if (of_node_check_flag(rd->dn, OF_POPULATED)) >>>>>>> return NOTIFY_OK; >>>>>>> >>>>>>> - /* >>>>>>> - * Clear the flag before adding the device so that fw_devlink >>>>>>> - * doesn't skip adding consumers to this device. >>>>>>> - */ >>>>>>> - rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE; >>>>>>> /* pdev_parent may be NULL when no bus platform device */ >>>>>>> pdev_parent = of_find_device_by_node(parent); >>>>>>> pdev = of_platform_device_create(rd->dn, NULL, >>>>>>> diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c >>>>>>> index 2e0647a06890..b22944a207c9 100644 >>>>>>> --- a/drivers/spi/spi.c >>>>>>> +++ b/drivers/spi/spi.c >>>>>>> @@ -4791,11 +4791,6 @@ static int of_spi_notify(struct notifier_block *nb, unsigned long action, >>>>>>> return NOTIFY_OK; >>>>>>> } >>>>>>> >>>>>>> - /* >>>>>>> - * Clear the flag before adding the device so that fw_devlink >>>>>>> - * doesn't skip adding consumers to this device. >>>>>>> - */ >>>>>>> - rd->dn->fwnode.flags &= ~FWNODE_FLAG_NOT_DEVICE; >>>>>>> spi = of_register_spi_device(ctlr, rd->dn); >>>>>>> put_device(&ctlr->dev); >>>>>>> >>>>>> Sorry, some of you will receive this message now for second time. First >>>>>> message was sent to older series of patches. >>>>>> - >>>>>> >>>>>> Hello, >>>>>> >>>>>> Test system testing drivers for ROHM ICs bisected this commit to cause >>>>>> BD71847 drivers probe to not be called. >>>>> This driver (and overlay support) is in linux-next or something out of >>>>> tree on top of linux-next? >>>>> >>>>> Rob >>>> Yes the driver is in mainline linux: /drivers/mfd/rohm-bd718x7.c >>> I don't see any support to apply overlays in that driver. >> Ah. Sorry for the confusion peeps. I asked Kalle to report this without >> proper consideration. 100% my bad. >> >> While the bd718x7 drive indeed is mainline (and tested), the actual >> 'glue-code' doing the overlay is part of the downstream test >> infrastructure. So yes, this is not a bug in upstream kernel - this >> falls in the category of an upstream change causing downstream things to >> break. So, feel free to say: "Go fix your code" :) >> >> Now that this is sorted, if someone is still interested in helping us to >> get our upstream drivers tested - the downstream piece is just taking >> the compiled device-tree overlay at runtime (via bin-attribute file), >> and applying it using the of_overlay_fdt_apply(). The approach is >> working for our testing purposes when the device is added to I2C/SPI >> node which is already enabled. However, in case where we have the I2C >> disabled, and enable it in the same overlay where we add the new device >> - then the new device does not get probed. >> >> I would be really grateful if someone had a pointer for us. > Seems to be fw_devlink related. I suppose if you turn it off it works? > There's info about the dependencies in sysfs or maybe debugfs. I don't > remember the details, but that should help to tell you why things > aren't probing. > > I've dropped the changes for 6.18 for now. No one really seems to be > in need of them yet AFAICT. > > Rob Hello, Thank you for the help. We are going to look into sysfs / debugfs as soon as we have time. I tried with this and result was the same, BD71847 was not probed: [    0.000000] Kernel command line: console=ttyO0,115200n8 root=/dev/nfs rw nfsroot=192.168.255.126:/home/user01/nfs,nfsvers=3 ip=192.168.255.1:192.168.255.126::255.255.255.0:bbb1:eth0 nfsrootdebug  fw_devlink=no With todays linux-next the BD71847 got probed; I assume the changes got dropped for the moment. Kalle