From patchwork Fri Oct 25 07:54:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam via B4 Relay X-Patchwork-Id: 13850166 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 DDAD8199237; Fri, 25 Oct 2024 07:55:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729842903; cv=none; b=eDzRdNuBFZvVhMqDWco2avZ4Bj+1vGeY7xDCYa1QLRUwxt5rVS9i3gThvtV6kO+5ZjXd71sZyHxgzU3Z45zzGv4ASNVB8k7jb4GfqTwPHGCqXhjNAiaz/OgtiBy4pnW9Sa2AH88+7wjbh7SaPHuUyomxElc4QJLOGVdZ9Lat/N8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729842903; c=relaxed/simple; bh=xsioCY39TMmED4dmq57286M326Pu5X0lo5xq75LORhM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=jpbgIwGsBdbgjRwsxCRbNrgh4QQhKXD4boo4hLwpfCq/W64nPx8FYzU3+LF6J2XQClfoW0SBd1ie4LNxQ2MZzUGi8oaAFQu4p5GKQcEwmxRBbX0q4E3AcAkVfN4sxZzfuniIJSyr/b+pW1yyREmrRsDPaNKYfHpcLStrWxYhgS8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=hFPTLDMB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="hFPTLDMB" Received: by smtp.kernel.org (Postfix) with ESMTPS id 9E914C4CEE8; Fri, 25 Oct 2024 07:55:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729842902; bh=xsioCY39TMmED4dmq57286M326Pu5X0lo5xq75LORhM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=hFPTLDMB2EIwbwnDV5uPvFVg4rp4l7feinLaAWUrv5XcTxwnKL2PRQ8Rglf3o6p+u TmbOt1fomWK9Cg+zg/d+LjEWH47ILV3Xy3RfdWKsEo1LBS93Mpof9lBMhEA/QFO0l1 LqRQyaVhsAoRYXa0TjGjaAMskalBts3c5VwpnTrdYoyp0/iDJGfG0bMI3S+BdbGbQ5 5fCJPjbFxWBSBAMUVQB6MHuAq5njovLFW80TyTwbk/1KvOi5QmF/Iyxwq3iztQLkjj ChgyciUrLQoh8o6uib+vuJkiq2CM1U+Pux3NBsLo3FTpLBa0sTb89ZgS68dR/DFkVI GrXyzv1u7NBMw== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 94A63D1171C; Fri, 25 Oct 2024 07:55:02 +0000 (UTC) From: Manivannan Sadhasivam via B4 Relay Date: Fri, 25 Oct 2024 13:24:54 +0530 Subject: [PATCH v2 4/5] PCI/pwrctl: Move pwrctl device creation to its own helper function Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241025-pci-pwrctl-rework-v2-4-568756156cbe@linaro.org> References: <20241025-pci-pwrctl-rework-v2-0-568756156cbe@linaro.org> In-Reply-To: <20241025-pci-pwrctl-rework-v2-0-568756156cbe@linaro.org> To: Bjorn Helgaas , Bartosz Golaszewski , Bartosz Golaszewski Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Dmitry Baryshkov , Johan Hovold , Abel Vesa , Stephan Gerhold , Srinivas Kandagatla , Bjorn Andersson , Manivannan Sadhasivam , Krishna chaitanya chundru X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=3016; i=manivannan.sadhasivam@linaro.org; h=from:subject:message-id; bh=umde/gEf3xryIYWhEQXTOZb+OYyr+RucmbbfjNEuNcQ=; b=owEBbQGS/pANAwAKAVWfEeb+kc71AcsmYgBnG07UGAg9nkrolL4cB2g9Lnx0saPQGfzOUZKEF 4f39fULM7uJATMEAAEKAB0WIQRnpUMqgUjL2KRYJ5dVnxHm/pHO9QUCZxtO1AAKCRBVnxHm/pHO 9XIyCACmIiZaGcBALCNfIceqSQuEMavLpnbUGB4PRhmxgVrRK3KsjTE3altX3gKuayVDbA6MR3Z YiUMRxKobB14WbeJfc/fRDsre7fZ2+azeqIhWHn+u8UYO7SH7+jOE+hh+9jmwrebUljwPUfz8JH +8vK8++I8r4WniCN1YNdSVFJHIIhhG1UAbNsC+1wnoFEuM03eV6J0EQ9+4TB68NzIe2r0laSe0h 1THtkvz3FZ7xxNR3pX5foODZnCS6KsBzIagXJ2Woiv+gNZ1nkt6A0bFU20MFJj+r+In1XBy79lE Ysj3gxw/BxiBmLvcIRKdN9h8CNds8DilRH01bXxFviD4AVYd X-Developer-Key: i=manivannan.sadhasivam@linaro.org; a=openpgp; fpr=C668AEC3C3188E4C611465E7488550E901166008 X-Endpoint-Received: by B4 Relay for manivannan.sadhasivam@linaro.org/default with auth_id=185 X-Original-From: Manivannan Sadhasivam Reply-To: manivannan.sadhasivam@linaro.org From: Manivannan Sadhasivam This makes the pci_bus_add_device() API easier to maintain. Also add more comments to the helper to describe how the devices are created. Tested-by: Krishna chaitanya chundru Tested-by: Bartosz Golaszewski Signed-off-by: Manivannan Sadhasivam Reviewed-by: Bartosz Golaszewski --- drivers/pci/bus.c | 59 ++++++++++++++++++++++++++++++++++++++----------------- 1 file changed, 41 insertions(+), 18 deletions(-) diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c index 645bbb75f8f9..6e38984e576d 100644 --- a/drivers/pci/bus.c +++ b/drivers/pci/bus.c @@ -321,6 +321,46 @@ void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { } void __weak pcibios_bus_add_device(struct pci_dev *pdev) { } +/* + * Create pwrctl devices (if required) for the PCI devices to handle the power + * state. + */ +static void pci_pwrctl_create_devices(struct pci_dev *dev) +{ + struct device_node *np = dev_of_node(&dev->dev); + struct device *parent = &dev->dev; + struct platform_device *pdev; + + /* + * First ensure that we are starting from a PCI bridge and it has a + * corresponding devicetree node. + */ + if (np && pci_is_bridge(dev)) { + /* + * Now look for the child PCI device nodes and create pwrctl + * devices for them. The pwrctl device drivers will manage the + * power state of the devices. + */ + for_each_available_child_of_node_scoped(np, child) { + /* + * First check whether the pwrctl device really needs to + * be created or not. This is decided based on at least + * one of the power supplies being defined in the + * devicetree node of the device. + */ + if (!of_pci_is_supply_present(child)) { + pci_dbg(dev, "skipping OF node: %s\n", child->name); + return; + } + + /* Now create the pwrctl device */ + pdev = of_platform_device_create(child, NULL, parent); + if (!pdev) + pci_err(dev, "failed to create OF node: %s\n", child->name); + } + } +} + /** * pci_bus_add_device - start driver for a single device * @dev: device to add @@ -345,24 +385,7 @@ void pci_bus_add_device(struct pci_dev *dev) pci_proc_attach_device(dev); pci_bridge_d3_update(dev); - if (dev_of_node(&dev->dev) && pci_is_bridge(dev)) { - for_each_available_child_of_node_scoped(dn, child) { - /* - * First check whether the pwrctl device needs to be - * created or not. This is decided based on at least - * one of the power supplies being defined in the - * devicetree node of the device. - */ - if (!of_pci_is_supply_present(child)) { - pci_dbg(dev, "skipping OF node: %s\n", child->name); - continue; - } - - pdev = of_platform_device_create(child, NULL, &dev->dev); - if (!pdev) - pci_err(dev, "failed to create OF node: %s\n", child->name); - } - } + pci_pwrctl_create_devices(dev); /* * Create a device link between the PCI device and pwrctl device (if