linux-kernel - Re: [PATCH RFC NOT TESTED 2/2] PCI: artpec6: Use use_parent_dt_ranges and clean up artpec6_pcie_cpu_addr

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Message-ID: <20250304190816.GA253203@bhelgaas>
Date: Tue, 4 Mar 2025 13:08:16 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Frank Li <Frank.Li@....com>
Cc: Jesper Nilsson <jesper.nilsson@...s.com>,
	Lars Persson <lars.persson@...s.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-arm-kernel@...s.com,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH RFC NOT TESTED 2/2] PCI: artpec6: Use
 use_parent_dt_ranges and clean up artpec6_pcie_cpu_addr_fixup()

On Tue, Mar 04, 2025 at 12:49:36PM -0500, Frank Li wrote:
> Remove artpec6_pcie_cpu_addr_fixup() as the DT bus fabric should provide correct
> address translation. Set use_parent_dt_ranges to allow the DWC core driver to
> fetch address translation from the device tree.

Shouldn't we be able to detect platforms where DT doesn't describe the
translation correctly?  E.g., by running .cpu_addr_fixup() on a
res.start value and comparing the result to the parent_bus_addr()?
Then we could complain about it if they don't match.

Bjorn