From patchwork Thu Aug 8 15:46:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Herve Codina X-Patchwork-Id: 13757881 Received: from mslow1.mail.gandi.net (mslow1.mail.gandi.net [217.70.178.240]) (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 87A6F18B475; Thu, 8 Aug 2024 15:48:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.178.240 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723132131; cv=none; b=f9U4JKXxvAXI09tgl/iHZs4ahGw4yRCLmKbX9OsxaHjcy6G/n3B0+3Y2uoXRuf+LoL3/rC9CG2o4J9i7RCrE8RWZFsas2ZgddMUSnP47awsJNHGE5eykaRnp+qKfGL7fCqFhMC9SaBnqnoXAs9DyGgT+tUenke4Y7T4ECLZJWCU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723132131; c=relaxed/simple; bh=8amnAIQvrAmtGLiSLYh5ew/M/mrExMmsWac507zvq1g=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=RQMr8trD1q1HDdVr8yo2AFPsAKl9vRQYmFhY1pxuq4kaMKbwLzF9WxtjBFzC1UZegFWK2PFvSHkDSc/tT0IrGDj2ZNTixmy3mykcIbYx1ghUrz5KiE5AtNrgOmjIXTQKePI7lJ6uMq6AVWAoUUWLlq6oN638uACCb7Pv4B+kXgs= 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=lNs5drP3; arc=none smtp.client-ip=217.70.178.240 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="lNs5drP3" Received: from relay7-d.mail.gandi.net (unknown [IPv6:2001:4b98:dc4:8::227]) by mslow1.mail.gandi.net (Postfix) with ESMTP id F3346C00B9; Thu, 8 Aug 2024 15:47:38 +0000 (UTC) Received: by mail.gandi.net (Postfix) with ESMTPA id 5DF8B20002; Thu, 8 Aug 2024 15:47:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1723132050; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=i4wABtpkSzc5tFb+lJXKOeY3r/pTQyr6215hlMiVe/E=; b=lNs5drP3kU2uEgXOItXmEdki87IDpRCpol9zcLiWBOIe9hN/m1kap//X+1cV/8qCYoaUq7 SUJatnWjbwIDryzIzsDKqzi0oiptwit65qGDSE4Jbojf1OLfCnEfuczOikF+t6GA0JTIaj FveWLEoV1oYreyOvejxbj8cWOZgyeQmKAqY/geBMoe8sx82dnwT8tTEknZf1XtrIu9Vf5f tj8jOjMx8TK3iTO2vb1fMPTod29ok1cnuararGgsqfdezdwvgNSWpA6g1Ocf3mdrb9dcjZ OEF2e3JXsVRxWohxX0xk1EnyzNaGefMGamD/CHnY218Mg7NuNmLdEQkEcnHNwA== From: Herve Codina To: Geert Uytterhoeven , Andy Shevchenko , Simon Horman , Lee Jones , Arnd Bergmann , Derek Kiernan , Dragan Cvetic , Greg Kroah-Hartman , Herve Codina , Bjorn Helgaas , Philipp Zabel , Lars Povlsen , Steen Hegelund , Daniel Machon , UNGLinuxDriver@microchip.com, Rob Herring , Saravana Kannan Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Horatiu Vultur , Andrew Lunn , linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Allan Nielsen , Steen Hegelund , Luca Ceresoli , Thomas Petazzoni Subject: [PATCH v5 0/8] Add support for the LAN966x PCI device using a DT overlay Date: Thu, 8 Aug 2024 17:46:49 +0200 Message-ID: <20240808154658.247873-1-herve.codina@bootlin.com> X-Mailer: git-send-email 2.45.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-GND-Sasl: herve.codina@bootlin.com Hi, This series adds support for the LAN966x chip when used as a PCI device. For reference, the LAN996x chip is a System-on-chip that integrates an Ethernet switch and a number of other traditional hardware blocks such as a GPIO controller, I2C controllers, SPI controllers, etc. The LAN996x can be used in two different modes: - With Linux running on its Linux built-in ARM cores. This mode is already supported by the upstream Linux kernel, with the LAN996x described as a standard ARM Device Tree in arch/arm/boot/dts/microchip/lan966x.dtsi. Thanks to this support, all hardware blocks in the LAN996x already have drivers in the upstream Linux kernel. - As a PCI device, thanks to its built-in PCI endpoint controller. In this case, the LAN996x ARM cores are not used, but all peripherals of the LAN996x can be accessed by the PCI host using memory-mapped I/O through the PCI BARs. This series aims at supporting this second use-case. As all peripherals of the LAN996x already have drivers in the Linux kernel, our goal is to re-use them as-is to support this second use-case. Therefore, this patch series introduces a PCI driver that binds on the LAN996x PCI VID/PID, and when probed, instantiates all devices that are accessible through the PCI BAR. As the list and characteristics of such devices are non-discoverable, this PCI driver loads a Device Tree overlay that allows to teach the kernel about which devices are available, and allows to probe the relevant drivers in kernel, re-using all existing drivers with no change. This patch series for now adds a Device Tree overlay that describes an initial subset of the devices available over PCI in the LAN996x, and follow-up patch series will add support for more once this initial support has landed. In order to add this PCI driver, a number of preparation changes are needed: - Patches 1, 2 introduce the LAN996x PCI driver itself, together with its DT overlay and the related MAINTAINTER entry. - Patches 3 to 8 allow the reset driver used for the LAN996x to be built as a module. Indeed, in the case where Linux runs on the ARM cores, it is common to have the reset driver built-in. However, when the LAN996x is used as a PCI device, it makes sense that all its drivers can be loaded as modules. Compare to the previous iteration: https://lore.kernel.org/lkml/20240805101725.93947-1-herve.codina@bootlin.com/ this v5 series mainly: - Do improvements in LAN966x PCI driver - Add some 'Reviewed-by' Best regards, Hervé Changes v4 -> v4 - Patch 1 Add missing include files and keep pci_ids.h. Remove IRQ_RETVAL() usage. Use __free(). Remove the pdev->irq check. Avoid local variables in devm_pci_dev_remove_intr_ctrl() and lan966x_pci_load_overlay(). Use dev_err_probe(). Sort header includes in alphabetical order in dtbs file. - Patch 3 Fix a typo in commit log. Simplify modification done in device_node_get_syscon(). Use devm_add_action_or_reset(). - Patches 4, 5, 6 and 8 Add 'Reviewed-by: Steen Hegelund ' Changes v3 -> v4 - Patch 1 and 2 (v3 patch 6 and 7) Move the driver from drivers/mfd to drivers/misc. - Patch 4 and 5 (v3 patch 2) Rework reset driver dependencies and module building support. Split v3 patch into two distinct patches: - patch 4, as suggested by Geert, add a dependency on the LAN966x PCI device - patch 5, allows to build the reset controller driver as a module - Other patches Except reordering, no changes Changes v2 -> v3 - Patches 1 and 5 No changes - Patch 6 (v2 patch 18) Add a blank line in the commit log to split paragraphs Remove unneeded header file inclusion Use IRQ_RETVAL() Remove blank line Use dev_of_node() Use pci_{set,get}_drvdata() Remove unneeded pci_clear_master() call Move { 0, } to { } Remove the unneeded pci_dev member from the lan966x_pci structure Use PCI_VENDOR_ID_EFAR instead of the hardcoded 0x1055 PCI Vendor ID Add a comment related to the of_node check. - Patch 7 (v2 patch 19) No changes Patches removed in v3 - Patches 6 and 7 Extracted and sent separately https://lore.kernel.org/lkml/20240620120126.412323-1-herve.codina@bootlin.com/ - Patches 9 Already applied - Patches 8, 10 to 12 Extracted, reworked and sent separately https://lore.kernel.org/lkml/20240614173232.1184015-1-herve.codina@bootlin.com/ - Patches 13 to 14 Already applied Changes v1 -> v2 - Patch 1 Fix a typo in syscon.h (s/intline/inline/) - Patches 2..5 No changes - Patch 6 Improve the reset property description - Patch 7 Fix a wrong reverse x-mass tree declaration - Patch 8 removed (sent alone to net) https://lore.kernel.org/lkml/20240513111853.58668-1-herve.codina@bootlin.com/ - Patch 8 (v1 patch 9) Add 'Reviewed-by: Rob Herring (Arm) ' - Patch 9 (v1 patch 10) Rephrase and ident parameters descriptions - Patch 10 (v1 patch 11) No changes - Patch 11 (v1 patch 12) Fix a missing ret value assignment before a goto in .probe() Limit lines to 80 columns Use indices in register offset definitions - Patch 13 and 14 (new patches in v2) Add new test cases for existing of_changeset_add_prop_*() - Patch 15 (v1 patch 14) No changes - Patch 16 (new patches in v2) Add tests for of_changeset_add_prop_bool() - Patch 17 (v1 patch 15) Update commit subject Rewrap a paragraph in commit log - Patch 18 (v1 patch 16) Use PCI_IRQ_INTX instead of PCI_IRQ_LEGACY - Patch 19 (v1 patch 17) No changes Clément Léger (5): mfd: syscon: Add reference counting and device managed support reset: mchp: sparx5: Allow building as a module reset: mchp: sparx5: Release syscon when not use anymore reset: core: add get_device()/put_device on rcdev reset: mchp: sparx5: set the dev member of the reset controller Herve Codina (3): misc: Add support for LAN966x PCI device MAINTAINERS: Add the Microchip LAN966x PCI driver entry reset: mchp: sparx5: Add MCHP_LAN966X_PCI dependency MAINTAINERS | 6 + drivers/mfd/syscon.c | 138 ++++++++++++++-- drivers/misc/Kconfig | 24 +++ drivers/misc/Makefile | 3 + drivers/misc/lan966x_pci.c | 215 +++++++++++++++++++++++++ drivers/misc/lan966x_pci.dtso | 167 +++++++++++++++++++ drivers/pci/quirks.c | 1 + drivers/reset/Kconfig | 4 +- drivers/reset/core.c | 2 + drivers/reset/reset-microchip-sparx5.c | 11 +- include/linux/mfd/syscon.h | 16 ++ 11 files changed, 569 insertions(+), 18 deletions(-) create mode 100644 drivers/misc/lan966x_pci.c create mode 100644 drivers/misc/lan966x_pci.dtso