linux-kernel - [PATCH v1 0/3] PCI: brcmstb: Clkreq# accomodations of downstream device

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Date:   Thu,  6 Apr 2023 08:46:21 -0400
From:   Jim Quinlan <jim2101024@...il.com>
To:     linux-pci@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Cyril Brulebois <kibi@...ian.org>,
        Phil Elwell <phil@...pberrypi.com>,
        bcm-kernel-feedback-list@...adcom.com, jim2101024@...il.com,
        james.quinlan@...adcom.com
Cc:     devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS),
        linux-arm-kernel@...ts.infradead.org (moderated list:BROADCOM
        BCM2711/BCM2835 ARM ARCHITECTURE),
        linux-kernel@...r.kernel.org (open list),
        linux-rpi-kernel@...ts.infradead.org (moderated list:BROADCOM
        BCM2711/BCM2835 ARM ARCHITECTURE), Rob Herring <robh@...nel.org>
Subject: [PATCH v1 0/3] PCI: brcmstb: Clkreq# accomodations of downstream device

The current driver assumes the downstream devices can provide clkreq# for
ASPM.  These commits accomodate devices w/ or w/o clkreq# and also handle
L1SS-capable devices.

The Raspian Linux folks have already been using a PCIe RC property
"brcm,enable-l1ss".  These commits use the same property, in a
backward-compatible manner, and the implementaion adds more detail and also
automatically identifies devices w/o a clkreq# signal, i.e. most devices
plugged into an RPi CM4 IO board.

Jim Quinlan (3):
  dt-bindings: PCI: brcmstb: Add two optional props
  PCI: brcmstb: Clkreq# accomodations of downstream device
  PCI: brcmstb: Allow setting the completion timeout

 .../bindings/pci/brcm,stb-pcie.yaml           | 12 +++
 drivers/pci/controller/pcie-brcmstb.c         | 93 +++++++++++++++++--
 2 files changed, 95 insertions(+), 10 deletions(-)


base-commit: 99ddf2254febae9eab7fb0bcc02c5322243f5c49
-- 
2.17.1