linux-kernel - Re: [PATCH v3 1/3] of: address: Add parent_bus_addr to struct of_pci

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Message-ID: <20241003053817.eycemurigrr6qy4u@thinkpad>
Date: Thu, 3 Oct 2024 11:08:17 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Frank Li <Frank.Li@....com>
Cc: Rob Herring <robh@...nel.org>, Saravana Kannan <saravanak@...gle.com>,
	Jingoo Han <jingoohan1@...il.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Richard Zhu <hongxing.zhu@....com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, imx@...ts.linux.dev
Subject: Re: [PATCH v3 1/3] of: address: Add parent_bus_addr to struct
 of_pci_range

On Mon, Sep 30, 2024 at 02:44:53PM -0400, Frank Li wrote:
> Introduce field 'parent_bus_addr' in of_pci_range to retrieve untranslated
> CPU address information.
> 
> Refer to the diagram below to understand that the bus fabric in some
> systems (like i.MX8QXP) does not use a 1:1 address map between input and
> output.
> 
> Currently, many drivers use .cpu_addr_fixup() callback hardcodes that

s/drivers/controller drivers/

> translation in the code, e.g., "cpu_addr & CDNS_PLAT_CPU_TO_BUS_ADDR",
> "cpu_addr + BUS_IATU_OFFSET", etc, even though those translations *should*
> be described via DT.
> 

It'd be useful to mention which driver has the mentioned fixup as an example.

- Mani

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