[PATCH v2 0/3] Add PCIe DT support for TI's J784S4 SoC

[Siddharth Vadapalli <s-vadapalli@ti.com>]

Hello,

TI's J784S4 SoC has two Gen3 x4 Lane PCIe Controllers. This series adds
the necessary device-tree support to enable both PCIe instances in Root
Complex mode of operation by default. The device-tree overlay to enable
both instances in Endpoint mode of operation is also present in this
series.

v1:
https://lore.kernel.org/r/20240129114749.1197579-1-s-vadapalli@ti.com
Changes since v1:
- Rebased series on linux-next tagged next-2024020.
- All dependencies mentioned in v1 series have been met. This series has
  no further dependencies for functionality.
- Added "pcie0_ctrl" and "pcie1_ctrl" nodes within the System Controller
  node (scm_conf). This enables reusing the existing
  "ti,syscon-pcie-ctrl" property without having to map the entire System
  Controller region for configuring the PCIe specific registers within
  "scm_conf". This change is also done in the "overlay" file in patch
  3/3 w.r.t. providing the phandle to the pcie0_ctrl and pcie1_ctrl
  nodes to the "ti,syscon-pcie-ctrl" property in the overlay.

Test Logs:
1. PCIe0 and PCIe1 in Root Complex Modes of operation with an NVMe SSD
connected to the PCIe0 instance and the Read Performance measured with
hdparm command:
https://gist.github.com/Siddharth-Vadapalli-at-TI/96c4ca37dd855120516ccdc298548dc6
2. PCIe0 Endpoint Mode functionality verified with the overlay. Logs of
the RC enumerating PCIe0 as an Endpoint:
https://gist.github.com/Siddharth-Vadapalli-at-TI/01b6fb0c9494ab76607b574a728b84da
3. PCIe1 Endpoint Mode functionality verified with the overlay. Logs of
the RC enumerating PCIe1 as an Endpoint:
https://gist.github.com/Siddharth-Vadapalli-at-TI/e844ac92d56131cbb2c134fab621b1e6

Regards,
Siddharth.

Siddharth Vadapalli (3):
  arm64: dts: ti: k3-j784s4-main: Add PCIe nodes
  arm64: dts: ti: k3-j784s4-evm: Enable PCIe0 and PCIe1 in RC Mode
  arm64: dts: ti: k3-j784s4-evm: Add overlay for PCIe0 and PCIe1 EP Mode

 arch/arm64/boot/dts/ti/Makefile               |  7 +-
 .../dts/ti/k3-j784s4-evm-pcie0-pcie1-ep.dtso  | 79 ++++++++++++++++
 arch/arm64/boot/dts/ti/k3-j784s4-evm.dts      | 46 +++++++++
 arch/arm64/boot/dts/ti/k3-j784s4-main.dtsi    | 94 +++++++++++++++++++
 4 files changed, 225 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm64/boot/dts/ti/k3-j784s4-evm-pcie0-pcie1-ep.dtso

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2.40.1