linux-kernel - Re: [PATCH V9 3/5] PCI: Add PCI quirks to generate device tree node for Xilinx Alveo U50

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Message-ID: <20230621202553.GA115453@bhelgaas>
Date:   Wed, 21 Jun 2023 15:25:53 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Lizhi Hou <lizhi.hou@....com>
Cc:     linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, robh@...nel.org, max.zhen@....com,
        sonal.santan@....com, stefano.stabellini@...inx.com
Subject: Re: [PATCH V9 3/5] PCI: Add PCI quirks to generate device tree node
 for Xilinx Alveo U50

In subject, s/Add PCI/Add/ (no need to repeat "PCI")

On Wed, Jun 21, 2023 at 10:34:07AM -0700, Lizhi Hou wrote:
> 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.

s/added/add/ (tell me what the patch does, not what you did)

> Signed-off-by: Lizhi Hou <lizhi.hou@....com>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

> ---
>  drivers/pci/quirks.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index c525867760bf..c8f3acea752d 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -6041,3 +6041,14 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a2d, dpc_log_size);
>  DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a2f, dpc_log_size);
>  DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a31, dpc_log_size);
>  #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

s/For PCI device which have multiple/For a PCI device with multiple/

It looks like you intend two separate paragraphs in the comment.  If
so, add a blank line between them.  If not, rewrap so they're a single
paragraph.

> + * 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);
> -- 
> 2.34.1
>