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Wed, 02 Oct 2024 22:38:25 -0700 (PDT) Received: from thinkpad ([36.255.17.222]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2e182634b11sm2043389a91.0.2024.10.02.22.38.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 02 Oct 2024 22:38:25 -0700 (PDT) Date: Thu, 3 Oct 2024 11:08:17 +0530 From: Manivannan Sadhasivam To: Frank Li Cc: Rob Herring , Saravana Kannan , Jingoo Han , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Bjorn Helgaas , Richard Zhu , Lucas Stach , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, imx@lists.linux.dev Subject: Re: [PATCH v3 1/3] of: address: Add parent_bus_addr to struct of_pci_range Message-ID: <20241003053817.eycemurigrr6qy4u@thinkpad> References: <20240930-pci_fixup_addr-v3-0-80ee70352fc7@nxp.com> <20240930-pci_fixup_addr-v3-1-80ee70352fc7@nxp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20240930-pci_fixup_addr-v3-1-80ee70352fc7@nxp.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241002_223826_828460_CD97838F X-CRM114-Status: GOOD ( 12.31 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 -- மணிவண்ணன் சதாசிவம்