From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtpout-04.galae.net (smtpout-04.galae.net [185.171.202.116]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 61AEB423168 for ; Mon, 11 May 2026 15:59:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.171.202.116 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778515160; cv=none; b=DF8ZirPL+wO7gt+/otnjlXPQtradrN8xZgdm1ELlRTj3Y7yR/yJfC6FG4aSwnwjr0gfn86gvjQuKhqOzpjeNWBvD4V9KmCIQDxVRrCz0D3wecfos9WIWMEcp1FWKNfVENH/tXP4+1mSRV30VB30oCJxCTfITCJihfXM6spUPn5g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778515160; c=relaxed/simple; bh=w3bzU5+fI005BUSDFvDAmi3e1zzqSzsVWsUAnGjFQic=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=u8Yw1k+41qBkaPdew2LXjqz3rjYgK93vK8Y995JyLikFKQDBPAM7V7Z0LkDig/57GyA20sO7KhyTxOYChasJoQ0TEVvt6bVuvSUC1ZuxLxrtjxygcA7K975lqrVNYFM8EsRZEbB9Yz0YMTB/os/O65w/NDtWPzeD0vmsN/0l6U0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=YfZZptih; arc=none smtp.client-ip=185.171.202.116 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="YfZZptih" Received: from smtpout-01.galae.net (smtpout-01.galae.net [212.83.139.233]) by smtpout-04.galae.net (Postfix) with ESMTPS id D0591C5E14B; Mon, 11 May 2026 16:00:06 +0000 (UTC) Received: from mail.galae.net (mail.galae.net [212.83.136.155]) by smtpout-01.galae.net (Postfix) with ESMTPS id 4393560646; Mon, 11 May 2026 15:59:17 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 57F0511AF9F19; Mon, 11 May 2026 17:59:14 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=dkim; t=1778515156; h=from:subject:date:message-id:to:cc:mime-version: content-transfer-encoding:in-reply-to:references; bh=f43D8ATRX3ZZph2a3Y4bwWOu8qESFbudFIHWHnMpJY0=; b=YfZZptihTRlYwdSRQHCQLDvkQ2jWLRDBZz2ttBXSVwglXYbKb/G8UM8AG/eqBlyx18kIzB hAIa4P7oXrI/Q0orbZQbcxsTmKKi5/Z4Ev8pKxGSM8hVs4nILDCSWOQYl6CFMFrv8XuNqa jGx2I7MoAnA7c+q6aaKuQueGyETxufE1j59UJQcsMKZCbRQ/0KDNQSksl6AoWHCSHnEJQI 0mwzRDiBq2GufSS8/qVrpNKrY51qH2vCNtAUPNk/8iaPTXR7tgjsYc4DhSpMjSdeiAr+OP rcAtQpYhsyzkezU0KQ5Eh4jvFIQeGEkkT1AsKMOovLbFQ+R3dT+B83Q8Sz/C0g== From: Herve Codina To: Andrew Lunn , Rob Herring , Saravana Kannan , Geert Uytterhoeven , Kalle Niemi , Matti Vaittinen , Greg Kroah-Hartman , "Rafael J. Wysocki" , Danilo Krummrich Cc: driver-core@lists.linux.dev, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Allan Nielsen , Horatiu Vultur , Daniel Machon , Steen Hegelund , Luca Ceresoli , Thomas Petazzoni , Herve Codina Subject: [PATCH v7 2/2] bus: simple-pm-bus: Populate child nodes at probe Date: Mon, 11 May 2026 17:59:00 +0200 Message-ID: <20260511155902.34534-3-herve.codina@bootlin.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260511155902.34534-1-herve.codina@bootlin.com> References: <20260511155902.34534-1-herve.codina@bootlin.com> Precedence: bulk X-Mailing-List: driver-core@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Last-TLS-Session-Version: TLSv1.3 The simple-pm-bus driver handles several simple busses. When it is used with busses other than a compatible "simple-pm-bus", it doesn't populate its child devices during its probe. This confuses fw_devlink and results in wrong or missing devlinks. Once a driver is bound to a device and the probe() has been called, device_links_driver_bound() is called. This function performs operation based on the following assumption: If a child firmware node of the bound device is not added as a device, it will never be added. Among operations done on fw_devlinks of those "never be added" devices, device_links_driver_bound() changes their supplier. With devices attached to a simple-bus compatible device, this change leads to wrong devlinks where supplier of devices points to the device parent (i.e. simple-bus compatible device) instead of the device itself (i.e. simple-bus child). When the device attached to the simple-bus is removed, because devlinks are not correct, its consumers are not removed first. In order to have correct devlinks created, make the simple-pm-bus driver compliant with the devlink assumption and create its child devices during its probe. Signed-off-by: Herve Codina --- drivers/bus/simple-pm-bus.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) diff --git a/drivers/bus/simple-pm-bus.c b/drivers/bus/simple-pm-bus.c index 4b2a793dfbd9..d969bf19a4e9 100644 --- a/drivers/bus/simple-pm-bus.c +++ b/drivers/bus/simple-pm-bus.c @@ -42,14 +42,15 @@ static int simple_pm_bus_probe(struct platform_device *pdev) match = of_match_device(dev->driver->of_match_table, dev); /* * These are transparent bus devices (not simple-pm-bus matches) that - * have their child nodes populated automatically. So, don't need to - * do anything more. We only match with the device if this driver is - * the most specific match because we don't want to incorrectly bind to - * a device that has a more specific driver. + * need to have their child nodes populated. So, don't need to do + * anything more except populate child nodes during this probe(). We + * only match with the device if this driver is the most specific match + * because we don't want to incorrectly bind to a device that has a more + * specific driver. */ if (match && match->data) { if (of_property_match_string(np, "compatible", match->compatible) == 0) - return 0; + goto populate; else return -ENODEV; } @@ -64,13 +65,14 @@ static int simple_pm_bus_probe(struct platform_device *pdev) dev_set_drvdata(&pdev->dev, bus); - dev_dbg(&pdev->dev, "%s\n", __func__); - pm_runtime_enable(&pdev->dev); +populate: if (np) of_platform_populate(np, NULL, lookup, &pdev->dev); + dev_dbg(&pdev->dev, "%s\n", __func__); + return 0; } @@ -78,7 +80,7 @@ static void simple_pm_bus_remove(struct platform_device *pdev) { const void *data = of_device_get_match_data(&pdev->dev); - if (device_has_driver_override(&pdev->dev) || data) + if (device_has_driver_override(&pdev->dev)) return; dev_dbg(&pdev->dev, "%s\n", __func__); @@ -86,7 +88,8 @@ static void simple_pm_bus_remove(struct platform_device *pdev) if (pdev->dev.of_node) of_platform_depopulate(&pdev->dev); - pm_runtime_disable(&pdev->dev); + if (!data) + pm_runtime_disable(&pdev->dev); } static int simple_pm_bus_runtime_suspend(struct device *dev) -- 2.54.0