linux-kernel - [PATCH V5 0/9] PCI: tegra: Add Tegra234 PCIe support

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Date:   Wed, 13 Jul 2022 14:30:20 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     <bhelgaas@...gle.com>, <lpieralisi@...nel.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>
CC:     <kw@...ux.com>, <kishon@...com>, <linux-pci@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, <vidyas@...dia.com>, <sagar.tv@...il.com>
Subject: [PATCH V5 0/9] PCI: tegra: Add Tegra234 PCIe support

Tegra234 has a total of 11 PCIe controllers based on Synopsys DesignWare core.
There are three Universal PHY (UPHY) blocks (viz. HSIO, NVHS and GBE) with
each block supporting 8 lanes respectively. Controllers:0~4 use UPHY lanes
from HSIO block, Controllers:5,6 use UPHY lanes from NVHS block and
Controllers:7~10 use UPHY lanes from GBE block. Lane mapping in each block
is controlled in XBAR module by BPMP-FW. Since PCIe core has PIPE interface,
a glue module called PIPE-to-UPHY (P2U) is used to connect each UPHY lane
(applicable to all three UPHY bricks i.e. HSIO/NVHS/GBE) to PCIe controller.
All the controllers can operate in the RootPort mode where as only controllers
C5, C6, C7 and C10 can operate in the EndPoint mode.

This patch series
- Adds support for Tegra234 in the existing P2U PHY driver
- Adds support for Tegra234 in the existing PCIe platform controller driver
- Adds device tree nodes for all PCIe controllers
- Enables nodes applicable to P3737-0000 platform

Testing done on P3737-0000 platform
- PCIe link is up with on-board Broadcom WiFi controller

- PCIe link is up with an NVMe drive connected to M.2 Key-M slot and its
  functionality is verified

- PCIe link is up with a variety of cards (NICs and USB3.0 add-on cards)
  connected to CEM slot and their functionality is verified

- PCIe link is up with C5 controller configured for the endpoint mode with
  a host

V5:
* Addressed review comments from Rob

V4:
* Addressed review comments from Krzysztof and Rob
* Changes are only in schema files and regulator patch
* Dropped PHY related patches as they are already accepted

V3:
* Add DT nodes for the controllers that can work in the EndPoint mode
* Converted the existing device-tree binding documentation from .txt to .yaml
* Add T234 specific information to the RP and EP .yaml documentation files
* Added regulators required to power up required power rails

V2:
* Dropped 3 patches that add clocks & resets IDs, power-domain IDs and
  memory IDs for PCIe controllers as the patches are already available
  in linux-next
* Based on Bjorn's review comment, reverted the commit b57256918399 ("PCI:
  tegra194: Rename tegra_pcie_dw to tegra194_pcie") and pushed it as a
  separate patch before adding support for T234 in the existing driver
* Addressed review comments from Rob for the other changes

Vidya Sagar (9):
  dt-bindings: pci: tegra: Convert to json-schema
  dt-bindings: PCI: tegra234: Add schema for tegra234 rootport mode
  dt-bindings: PCI: tegra234: Add schema for tegra234 endpoint mode
  arm64: tegra: Add regulators required for PCIe
  arm64: tegra: Add P2U and PCIe controller nodes to Tegra234 DT
  arm64: tegra: Enable PCIe slots in P3737-0000 board
  PCI: Disable MSI for Tegra234 root ports
  Revert "PCI: tegra194: Rename tegra_pcie_dw to tegra194_pcie"
  PCI: tegra: Add Tegra234 PCIe support

 .../bindings/pci/nvidia,tegra194-pcie-ep.yaml | 318 ++++++
 .../bindings/pci/nvidia,tegra194-pcie.txt     | 245 -----
 .../bindings/pci/nvidia,tegra194-pcie.yaml    | 349 +++++++
 .../devicetree/bindings/pci/snps,dw-pcie.yaml |   4 +-
 .../boot/dts/nvidia/tegra234-p3701-0000.dtsi  |  36 +
 .../nvidia/tegra234-p3737-0000+p3701-0000.dts |  51 +
 arch/arm64/boot/dts/nvidia/tegra234.dtsi      | 927 ++++++++++++++++++
 drivers/pci/controller/dwc/pcie-tegra194.c    | 622 ++++++++----
 drivers/pci/quirks.c                          |  13 +-
 9 files changed, 2118 insertions(+), 447 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie-ep.yaml
 delete mode 100644 Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt
 create mode 100644 Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.yaml

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2.34.1