linux-kernel - [PATCH RFC V4 3/3] PCI: Add PCI quirks to generate device tree node for Xilinx Alveo U50

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Message-ID: <1668044538-27334-4-git-send-email-lizhi.hou@amd.com>
Date:   Wed, 9 Nov 2022 17:42:18 -0800
From:   Lizhi Hou <lizhi.hou@....com>
To:     <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <robh@...nel.org>,
        <frowand.list@...il.com>, <helgaas@...nel.org>
CC:     Lizhi Hou <lizhi.hou@....com>, <clement.leger@...tlin.com>,
        <max.zhen@....com>, <sonal.santan@....com>, <larry.liu@....com>,
        <brian.xu@....com>, <stefano.stabellini@...inx.com>,
        <trix@...hat.com>
Subject: [PATCH RFC V4 3/3] PCI: Add PCI quirks to generate device tree node for Xilinx Alveo U50

The Xilinx Alveo U50 PCI card exposes multiple hardware peripherals on
its PCI BAR. The card firmware provides a flattened device tree to
describe the hardware peripherals on its BARs. This allows U50 driver to
load the flattened device tree and generate the device tree node for
hardware peripherals underneath.

To generate device tree node for U50 card, added PCI quirks to call
of_pci_make_dev_node() for U50.

Signed-off-by: Lizhi Hou <lizhi.hou@....com>
Signed-off-by: Sonal Santan <sonal.santan@....com>
Signed-off-by: Max Zhen <max.zhen@....com>
Reviewed-by: Brian Xu <brian.xu@....com>
---
 drivers/pci/quirks.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 4944798e75b5..5d76932f59ec 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5956,3 +5956,14 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x56b1, aspm_l1_acceptable_latency
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x56c0, aspm_l1_acceptable_latency);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x56c1, aspm_l1_acceptable_latency);
 #endif
+
+/*
+ * For PCI device which have multiple downstream devices, its driver may use
+ * a flattened device tree to describe the downstream devices.
+ * To overlay the flattened device tree, the PCI device and all its ancestor
+ * devices need to have device tree nodes on system base device tree. Thus,
+ * before driver probing, it might need to add a device tree node as the final
+ * fixup.
+ */
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_XILINX, 0x5020, of_pci_make_dev_node);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_XILINX, 0x5021, of_pci_make_dev_node);
-- 
2.17.1