From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, T_DKIMWL_WL_HIGH,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 441C9C433F4 for ; Mon, 27 Aug 2018 03:03:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EF91B21722 for ; Mon, 27 Aug 2018 03:03:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="Xt9pfFSk" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org EF91B21722 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=ti.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727337AbeH0Gry (ORCPT ); Mon, 27 Aug 2018 02:47:54 -0400 Received: from lelv0143.ext.ti.com ([198.47.23.248]:57642 "EHLO lelv0143.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727159AbeH0Grx (ORCPT ); Mon, 27 Aug 2018 02:47:53 -0400 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id w7R32QVN046572; Sun, 26 Aug 2018 22:02:26 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1535338946; bh=LVfKNu97CZvHKk0ilqoFSQHuSu5A8ZgUkHYD8u5FjFk=; h=Subject:To:References:CC:From:Date:In-Reply-To; b=Xt9pfFSkuobcxr9MPhf74dwUyjMoYNZwnMaMtvGCuAaGxF3Nv+5NggDuWfEVm8JR5 5VkYdgTzQyQFAf76kx5KKW9/b524B0NqH4Zqh0kP1Gm8cb+FJKKbvTZ/3dekZDU4RL NahD/p2y+jSS1msLvHE2iQHttIFM7OU4vLOhc15g= Received: from DLEE108.ent.ti.com (dlee108.ent.ti.com [157.170.170.38]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id w7R32QpN026026; Sun, 26 Aug 2018 22:02:26 -0500 Received: from DLEE100.ent.ti.com (157.170.170.30) by DLEE108.ent.ti.com (157.170.170.38) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1466.3; Sun, 26 Aug 2018 22:02:26 -0500 Received: from dlep32.itg.ti.com (157.170.170.100) by DLEE100.ent.ti.com (157.170.170.30) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.1466.3 via Frontend Transport; Sun, 26 Aug 2018 22:02:26 -0500 Received: from [172.24.190.233] (ileax41-snat.itg.ti.com [10.172.224.153]) by dlep32.itg.ti.com (8.14.3/8.13.8) with ESMTP id w7R32Lne019603; Sun, 26 Aug 2018 22:02:22 -0500 Subject: Re: [RFC PATCH 5/6] arm64: dts: ti: Add Support for AM654 SoC To: Tony Lindgren References: <20180605060510.32473-1-nm@ti.com> <454c277e-8a63-81cb-b341-a50f4e25cbea@ti.com> <20180820143153.GD7523@atomide.com> CC: Rob Herring , Nishanth Menon , Santosh Shilimkar , Will Deacon , Catalin Marinas , Greg Kroah-Hartman , Mark Rutland , "open list:SERIAL DRIVERS" , "linux-kernel@vger.kernel.org" , , "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" , Vignesh R , Tero Kristo , Russell King , Sudeep Holla From: Kishon Vijay Abraham I Message-ID: <40cecb47-bd32-04aa-b7cd-ff16c1eb28f3@ti.com> Date: Mon, 27 Aug 2018 08:32:21 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 In-Reply-To: <20180820143153.GD7523@atomide.com> Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Tony, On Monday 20 August 2018 08:01 PM, Tony Lindgren wrote: > * Kishon Vijay Abraham I [180808 06:35]: >> On Tuesday 05 June 2018 07:35 PM, Rob Herring wrote: >>> Really need 64-bit addresses and sizes? Use ranges to limit the >>> address space if possible. >> >> We now have address-cells as <1>, >> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/arch/arm64/boot/dts/ti/k3-am65.dtsi#n49 >> >> However each PCIe instance has 2 data regions and one of the regions >> (PCIE0_CORE_CORE_DAT_SLV_PCIE_DAT1/PCIE1_CORE_CORE_DAT_SLV_PCIE_DAT1 specified >> in the "MAIN Domain Memory Map" table of TRM http://www.ti.com/lit/pdf/spruid7) >> is above the 32bit region and requires 2 cells to specify the start address. >> This region is used to access MEM_SPACE of PCIe endpoint when operating in root >> complex mode and access memory of PCI root complex when operating in endpoint mode. >> >> In order to describe this, should we change the address-cells back to <2> or do >> you suggest any other alternatives? > > It's probably best to have the top level cbass interconnect use > #size-cells = <2> and then have it's child interconnects have > #size-cells = <1> if they don't need ranges above 4GB. PCIe has a region starting at 0x40_00000000 and size 4GB. We need 2 address cells and 2 size cells to describe this no? > > BTW, what's the difference between all these three similar PCIE > ranges? > > PCIE0_CORE_CORE_DAT_SLV_PCIE_CORE 0x0005500000 0x0005600000 1 MB > PCIE1_CORE_CORE_DAT_SLV_PCIE_CORE 0x0005600000 0x0005700000 1 MB This is the register space for the two instances of PCIe controller. > > PCIE0_CORE_CORE_DAT_SLV_PCIE_DAT0 0x0010000000 0x0018000000 128 MB > PCIE1_CORE_CORE_DAT_SLV_PCIE_DAT0 0x0018000000 0x0020000000 128 MB > > PCIE0_CORE_CORE_DAT_SLV_PCIE_DAT1 0x4000000000 0x4100000000 4 GB > PCIE1_CORE_CORE_DAT_SLV_PCIE_DAT1 0x4100000000 0x4200000000 4 GB The above are regions which can be used by CPU/DMA to access the PCIe address space. The mapping from the above regions to the PCIe address space will be programmed in the PCIe controller. Thanks Kishon