From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from relay5-d.mail.gandi.net (relay5-d.mail.gandi.net [217.70.183.197]) (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 1A5711311AC; Thu, 10 Oct 2024 06:26:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728541620; cv=none; b=rcVmjg2LNytwYgnah2/0dLD0nWHBCoSK9UqFPrT5ajyDMxGI+QicZME0CdlPdU6T+9JPIUcxIetZqRYGNh+chJHwftiWl5vlNTzRIknUq5R+6SKUbBt1eSUVWC0oWZfm2nicHOiGIDLNJT1w470iZJ+IXPODNvTjkSDUw2PMJsk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728541620; c=relaxed/simple; bh=EvI/qJ15zbZGdGfeooCEMBfg4KGH3GswpaPbNywUqHU=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=QiRUqf5KijpUdw+eVuTLcMgNWyPDuwlidIlaVfkr9mhRWUYkLCiyZTEfiG/9f2uwyJwG7HeJ4o6av6ElGscFpcJUDgj4OJC48UqwvKPw6tH9u376Y84wfxA4Lq8pbS630GQc3PCQyF/aLkQXnaud01hTt8kp/6nlZxBXHL9lQc8= 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=Uc7EF8fj; arc=none smtp.client-ip=217.70.183.197 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="Uc7EF8fj" Received: by mail.gandi.net (Postfix) with ESMTPSA id D5B1B1C0002; Thu, 10 Oct 2024 06:26:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1728541616; 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: in-reply-to:in-reply-to:references:references; bh=Yq2bMmXg3avuTOTYe5LzXsSimQ8+aelRdZJ9JnXzAUk=; b=Uc7EF8fjp9vr9m2qE97UgQeKyTnVZAUxMrPDoEPZewCNCO/k9xJ8r2f6Bc0PBZRDMohbWc bNFEa38f8RxKgSRZZ5e9Zxnpz1TT1jEhgvnU8oyeWH0fsKG27aqUMuAM8184pegVEmsdNN mK+ab38GaMXXn/BHANPpmD8iaBlP+ZF2ntfT4z+072bp5yoP1mlakfLn26sM9xDGVZx/eJ WpSfq0O3ZKwf/mPW+O+vtTI410CsujTV7SXJlOaU8dDoTVai7PZtaD44+p4aiboCKWqxIt 7AXKM85tArmSTt8g3aZ/6tkxML7BVShnuq6wt8tpZX2az1OX22XpQeamBltp7g== Date: Thu, 10 Oct 2024 08:26:53 +0200 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 , Krzysztof Kozlowski , Conor Dooley , Saravana Kannan Cc: "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Horatiu Vultur , Andrew Lunn , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Allan Nielsen , Luca Ceresoli , Thomas Petazzoni Subject: Re: [PATCH v8 0/6] Add support for the LAN966x PCI device using a DT overlay Message-ID: <20241010082653.77285b60@bootlin.com> In-Reply-To: <20241010061615.787073-1-herve.codina@bootlin.com> References: <20241010061615.787073-1-herve.codina@bootlin.com> Organization: Bootlin X-Mailer: Claws Mail 4.3.0 (GTK 3.24.43; x86_64-redhat-linux-gnu) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-GND-Sasl: herve.codina@bootlin.com Hi All, Please ignore this series. It doesn't contain modifications done for this v8. I will send a v9 to fix that. Sorry for the noise. Best regards, Hervé On Thu, 10 Oct 2024 08:16:08 +0200 Herve Codina wrote: > 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 > reuse 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 changes are needed: > - Patches 1 and 2 introduce the LAN996x PCI driver itself, together > with its DT overlay and the related MAINTAINER entry. > > - Patch 3 removes the syscon API usage from the reset driver used for > the LAN966x. > > - Patches 4 to 7 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/20241003081647.642468-1-herve.codina@bootlin.com/ > this v8 series mainly: > - Add missing spaces > - Add "Reviewed-by" tags > > Best regards, > Hervé > > Changes v7 -> v8 > - Patch 1 > Add missing spaces around '=' in dtso > > - Patches 2, 4, 5 and 6 > Add 'Reviewed-by: Philipp Zabel ' > > - Patch 3 > Add 'Reviewed-by: Steen Hegelund ' > Add 'Reviewed-by: Philipp Zabel ' > > Changes v6 -> v7 > - Patch 1 (patch 3 in v6) > Re-introduce the syscon node in the overlay > > - Patch 2 (patch 4 in v6) > No changes > > - Patch 3 (patch 2 in v6) > Rework code to map the syscon device locally without using the > syscon API in the LAN966x case. > Update commit log > > - Patches 4, 5 and 6 (patches 5, 6, and 7 in v6) > No changes > > Patch removed in v7 > - Patch 1 in v6 (reset controller DT binding modification) > Rejected > > Changes v5 -> v6 > - Patch 1 > New patch in v6 relatead to removing syscon usage. > > - Patch 2 > New patch in v6 related to removing syscon usage. > > - Patch 3 (patch 1 in v5) > Add 'Acked-by: Greg Kroah-Hartman ' > Remove syscon node from the overlay. > > - Patch 4, 5, 6 and 7 (patches 2, 4, 5 and 8 in v5) > No changes > > Patches removed in v6 > - Patch 3 in v5 > Rejected > > - Patch 6 in v5 > No more applicable > > - Patch 7 in v5 > Already applied > > Changes v4 -> v5 > - 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 (2): > reset: mchp: sparx5: Allow building as a module > reset: mchp: sparx5: set the dev member of the reset controller > > Herve Codina (4): > misc: Add support for LAN966x PCI device > MAINTAINERS: Add the Microchip LAN966x PCI driver entry > reset: mchp: sparx5: Map cpu-syscon locally in case of LAN966x > reset: mchp: sparx5: Add MCHP_LAN966X_PCI dependency > > MAINTAINERS | 6 + > 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/reset-microchip-sparx5.c | 38 ++++- > 8 files changed, 455 insertions(+), 3 deletions(-) > create mode 100644 drivers/misc/lan966x_pci.c > create mode 100644 drivers/misc/lan966x_pci.dtso > -- Hervé Codina, Bootlin Embedded Linux and Kernel engineering https://bootlin.com