From patchwork Mon Jul 26 08:31:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Kettenis X-Patchwork-Id: 12398879 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 68A08C4320A for ; Mon, 26 Jul 2021 08:39:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4827F6024A for ; Mon, 26 Jul 2021 08:39:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231791AbhGZH7O (ORCPT ); Mon, 26 Jul 2021 03:59:14 -0400 Received: from lb3-smtp-cloud9.xs4all.net ([194.109.24.30]:50795 "EHLO lb3-smtp-cloud9.xs4all.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231728AbhGZH7O (ORCPT ); Mon, 26 Jul 2021 03:59:14 -0400 X-Greylist: delayed 431 seconds by postgrey-1.27 at vger.kernel.org; Mon, 26 Jul 2021 03:59:13 EDT Received: from copland.sibelius.xs4all.nl ([83.163.83.176]) by smtp-cloud9.xs4all.net with ESMTP id 7w2DmOzH54Jsb7w2EmW9Mp; Mon, 26 Jul 2021 10:32:30 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=xs4all.nl; s=s2; t=1627288350; bh=aj0DzTZBIxsexmhMpHw/owBjAQ/ySL4SOuHiY/ftDuQ=; h=From:To:Subject:Date:Message-Id:MIME-Version:From:Subject; b=nLK+JyAPuW8TLciSMMU18MR4Dviz2di0rbveBUZTOX56W6zCXdjLBtrVDlGxtlyBL CH6MWD/KWITle4r2lS8oQ2dsKE/JnvpkkkmVznwD2BFYstl+3V0pmVBZkx2W2ElJIN 7QgQsLxZvsZm7U8o+tMSOFH0KsjO+q6yJ41DfvFqQRB2yUr85Qv0aZ6pf5Nw+J4OpM LcqR6LZ3r25AtyFEXyju4Ll8Uzh9R9UiO6k8kf3A4Magsx0BU6w0/Nx93SU8lLoE7T xXmbJB6wHOl7mnrVQ8iWfkr1wzNwM3WATYYwhhUPawgb/GZuPsub4VkSTL7M8NkIlH 4zcvTqcrYl4vw== From: Mark Kettenis To: devicetree@vger.kernel.org Cc: maz@kernel.org, robin.murphy@arm.com, sven@svenpeter.dev, Mark Kettenis , Hector Martin , Bjorn Helgaas , Rob Herring , linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 0/2] Apple M1 PCIe DT bindings Date: Mon, 26 Jul 2021 10:31:59 +0200 Message-Id: <20210726083204.93196-1-mark.kettenis@xs4all.nl> X-Mailer: git-send-email 2.32.0 MIME-Version: 1.0 X-CMAE-Envelope: MS4xfC5rqQSex9y1nQvPdjLYz3X7h5Q4DGif9oeHclh8nCZpGIdTg9koclwDAVwJ6j3uJUo13ZHnXuCUisnTHy7XVsOoBHL39lwjg4fh33ZdBx7WgcnguKyS fyMdN7n7uLsOMB7Do5VLRkEJujzA7SyCC9msk7K4DcTTgARf0DSiTekPkjehPe2rZm66+rcKB9csifgZu/ExdWXeLNNxUnkDGmIlcM+3H8nnkXUslvdj26i6 EshCJF+ZBEXyCvHz5Rco4raq8PE5+mpkiYkCwzq8ystAbzjQeIPHNL5nshgQoFQKQqKdxYEmU36A2bQ6i/B1d3xjirq+wiGOPU7gazf7YLhwKoNO49APTm29 ph19JG43no1SEv2IstkRGgs4YW+t22CUKTcn7+ml/SsX1WB63Q8MOlKwlBoV6fAhkEdnBgcnKROljEx9GDoGZAcex1Rtl4DKoEJoOLsMmei+hl9WXwBdSQdm ce95TfdKDgF8P6pnfdEBQKXsvC6UBhYqmQ+MRWd1mGfzjL2oAXGNe8OBq4SfcSDtQtahdn9iKJObo4SRg3T2UnM0PyTDbIHodmxLRQ== Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Mark Kettenis This small series adds bindings for the PCIe controller found on the Apple M1 SoC. At this point, the primary consumer for these bindings is U-Boot. With these bindings U-Boot can bring up the links for the root ports of the PCIe root complex. A simple OS driver can then provide standard ECAM access and manage MSI interrupts to provide access to the built-in Ethernet and XHCI controllers of the Mac mini. The Apple controller incorporates Synopsys Designware PCIe logic to implement its root port. But unlike other hardware currently supported by U-Boot and the Linux kernel the Apple hardware integrates multiple root ports. As such the existing bindings for the DWC PCIe interface can't be used. There is a single ECAM space for all root space, but separate GPIOs to take the PCI devices on those ports out of reset. Therefore the standard "reset-gpio" and "max-link-speed" properties appear on the child nodes representing the PCI devices that correspond to the individual root ports. MSIs are handled by the PCIe controller and translated into "regular interrupts". A range of 32 MSIs is provided. These 32 MSIs can be distributed over the root ports as the OS sees fit by programming the PCIe controller port registers. I still hope to hear from Marc Zyngier on the way MSIs are represented in this binding. Patch 2/2 of this series depends on the pinctrl series I sent earlier and will probably go through Hector Martin's Apple M1 SoC tree. Changelog: v3: - Remove unneeded include in example v2: - Adjust name for ECAM in "reg-names" - Drop "phy" registers - Expand description - Add description for "interrupts" - Fix incorrect minItems for "interrupts" - Fix incorrect MaxItems for "reg-names" - Document the use of "msi-controller", "msi-parent", "iommu-map" and "iommu-map-mask" - Fix "bus-range" and "iommu-map" properties in the example Mark Kettenis (2): dt-bindings: pci: Add DT bindings for apple,pcie arm64: apple: Add PCIe node .../devicetree/bindings/pci/apple,pcie.yaml | 166 ++++++++++++++++++ MAINTAINERS | 1 + arch/arm64/boot/dts/apple/t8103.dtsi | 63 +++++++ 3 files changed, 230 insertions(+) create mode 100644 Documentation/devicetree/bindings/pci/apple,pcie.yaml Reviewed-by: Marc Zyngier