From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rob Herring Subject: Re: [PATCH V7 09/15] dt-bindings: PCI: tegra: Add device tree support for Tegra194 Date: Fri, 24 May 2019 15:26:37 -0500 Message-ID: <20190524202637.GA24385@bogus> References: <20190517123846.3708-1-vidyas@nvidia.com> <20190517123846.3708-10-vidyas@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20190517123846.3708-10-vidyas@nvidia.com> Sender: linux-kernel-owner@vger.kernel.org To: Vidya Sagar Cc: lorenzo.pieralisi@arm.com, bhelgaas@google.com, mark.rutland@arm.com, thierry.reding@gmail.com, jonathanh@nvidia.com, kishon@ti.com, catalin.marinas@arm.com, will.deacon@arm.com, jingoohan1@gmail.com, gustavo.pimentel@synopsys.com, mperttunen@nvidia.com, linux-pci@vger.kernel.org, devicetree@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kthota@nvidia.com, mmaddireddy@nvidia.com, sagar.tv@gmail.com List-Id: linux-tegra@vger.kernel.org On Fri, May 17, 2019 at 06:08:40PM +0530, Vidya Sagar wrote: > Add support for Tegra194 PCIe controllers. These controllers are based > on Synopsys DesignWare core IP. > > Signed-off-by: Vidya Sagar > --- > Changes since [v6]: > * Changed description of the property "nvidia,bpmp". > * Removed property "nvidia,disable-aspm-states". > > Changes since [v5]: > * Removed 'max-link-speed' as it is going to be a common sub-system property > * Removed 'nvidia,init-link-speed' as there isn't much value addition > * Removed 'nvidia,wake-gpios' for now > * Addressed review comments from Thierry and Rob in general > > Changes since [v4]: > * None > > Changes since [v3]: > * None > > Changes since [v2]: > * Using only 'Cx' (x-being controller number) format to represent a controller > * Changed to 'value: description' format where applicable > * Changed 'nvidia,init-speed' to 'nvidia,init-link-speed' > * Provided more documentation for 'nvidia,init-link-speed' property > * Changed 'nvidia,pex-wake' to 'nvidia,wake-gpios' > > Changes since [v1]: > * Added documentation for 'power-domains' property > * Removed 'window1' and 'window2' properties > * Removed '_clk' and '_rst' from clock and reset names > * Dropped 'pcie' from phy-names > * Added entry for BPMP-FW handle > * Removed offsets for some of the registers and added them in code and would be pickedup based on > controller ID > * Changed 'nvidia,max-speed' to 'max-link-speed' and is made as an optional > * Changed 'nvidia,disable-clock-request' to 'supports-clkreq' with inverted operation > * Added more documentation for 'nvidia,update-fc-fixup' property > * Removed 'nvidia,enable-power-down' and 'nvidia,plat-gpios' properties > * Added '-us' to all properties that represent time in microseconds > * Moved P2U documentation to a separate file > > .../bindings/pci/nvidia,tegra194-pcie.txt | 158 ++++++++++++++++++ > 1 file changed, 158 insertions(+) > create mode 100644 Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt > > diff --git a/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt b/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt > new file mode 100644 > index 000000000000..0119f40bbd11 > --- /dev/null > +++ b/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt > @@ -0,0 +1,158 @@ > +NVIDIA Tegra PCIe controller (Synopsys DesignWare Core based) > + > +This PCIe host controller is based on the Synopsis Designware PCIe IP > +and thus inherits all the common properties defined in designware-pcie.txt. > + > +Required properties: > +- compatible: For Tegra19x, must contain "nvidia,tegra194-pcie". > +- device_type: Must be "pci" > +- power-domains: A phandle to the node that controls power to the respective > + PCIe controller and a specifier name for the PCIe controller. Following are > + the specifiers for the different PCIe controllers > + TEGRA194_POWER_DOMAIN_PCIEX8B: C0 > + TEGRA194_POWER_DOMAIN_PCIEX1A: C1 > + TEGRA194_POWER_DOMAIN_PCIEX1A: C2 > + TEGRA194_POWER_DOMAIN_PCIEX1A: C3 > + TEGRA194_POWER_DOMAIN_PCIEX4A: C4 > + TEGRA194_POWER_DOMAIN_PCIEX8A: C5 > + these specifiers are defined in > + "include/dt-bindings/power/tegra194-powergate.h" file. > +- reg: A list of physical base address and length pairs for each set of > + controller registers. Must contain an entry for each entry in the reg-names > + property. > +- reg-names: Must include the following entries: > + "appl": Controller's application logic registers > + "config": As per the definition in designware-pcie.txt > + "atu_dma": iATU and DMA registers. This is where the iATU (internal Address > + Translation Unit) registers of the PCIe core are made available > + for SW access. > + "dbi": The aperture where root port's own configuration registers are > + available > +- interrupts: A list of interrupt outputs of the controller. Must contain an > + entry for each entry in the interrupt-names property. > +- interrupt-names: Must include the following entries: > + "intr": The Tegra interrupt that is asserted for controller interrupts > + "msi": The Tegra interrupt that is asserted when an MSI is received > +- bus-range: Range of bus numbers associated with this controller > +- #address-cells: Address representation for root ports (must be 3) > + - cell 0 specifies the bus and device numbers of the root port: > + [23:16]: bus number > + [15:11]: device number > + - cell 1 denotes the upper 32 address bits and should be 0 > + - cell 2 contains the lower 32 address bits and is used to translate to the > + CPU address space > +- #size-cells: Size representation for root ports (must be 2) > +- ranges: Describes the translation of addresses for root ports and standard > + PCI regions. The entries must be 7 cells each, where the first three cells > + correspond to the address as described for the #address-cells property > + above, the fourth and fifth cells are for the physical CPU address to > + translate to and the sixth and seventh cells are as described for the > + #size-cells property above. > + - Entries setup the mapping for the standard I/O, memory and > + prefetchable PCI regions. The first cell determines the type of region > + that is setup: > + - 0x81000000: I/O memory region > + - 0x82000000: non-prefetchable memory region > + - 0xc2000000: prefetchable memory region > + Please refer to the standard PCI bus binding document for a more detailed > + explanation. > +- #interrupt-cells: Size representation for interrupts (must be 1) > +- interrupt-map-mask and interrupt-map: Standard PCI IRQ mapping properties > + Please refer to the standard PCI bus binding document for a more detailed > + explanation. > +- clocks: Must contain an entry for each entry in clock-names. > + See ../clocks/clock-bindings.txt for details. > +- clock-names: Must include the following entries: > + - core > +- resets: Must contain an entry for each entry in reset-names. > + See ../reset/reset.txt for details. > +- reset-names: Must include the following entries: > + - core_apb > + - core > +- phys: Must contain a phandle to P2U PHY for each entry in phy-names. > +- phy-names: Must include an entry for each active lane. > + "p2u-N": where N ranges from 0 to one less than the total number of lanes > +- nvidia,bpmp: Must contain a pair of phandle to BPMP controller node followed > + by controller-id. Following are the controller ids for each controller. > + 0: C0 > + 1: C1 > + 2: C2 > + 3: C3 > + 4: C4 > + 5: C5 > +- vddio-pex-ctl-supply: Regulator supply for PCIe side band signals > + > +Optional properties: > +- supports-clkreq: Refer to Documentation/devicetree/bindings/pci/pci.txt > +- nvidia,update-fc-fixup: This is a boolean property and needs to be present to > + improve perf when a platform is designed in such a way that it satisfies at > + least one of the following conditions thereby enabling root port to > + exchange optimum number of FC (Flow Control) credits with downstream devices > + 1. If C0/C4/C5 run at x1/x2 link widths (irrespective of speed and MPS) > + 2. If C0/C1/C2/C3/C4/C5 operate at their respective max link widths and > + a) speed is Gen-2 and MPS is 256B > + b) speed is >= Gen-3 with any MPS > +- "nvidia,aspm-cmrt-us": Common Mode Restore time for proper operation of ASPM > + to be specified in microseconds > +- "nvidia,aspm-pwr-on-t-us": Power On time for proper operation of ASPM to be > + specified in microseconds > +- "nvidia,aspm-l0s-entrance-latency-us": ASPM L0s entrance latency to be > + specified in microseconds > + > +Examples: > +========= > + > +Tegra194: > +-------- > + > +SoC DTSI: > + > + pcie@14180000 { > + compatible = "nvidia,tegra194-pcie", "snps,dw-pcie"; > + power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX8B>; > + reg = <0x00 0x14180000 0x0 0x00020000 /* appl registers (128K) */ > + 0x00 0x38000000 0x0 0x00040000 /* configuration space (256K) */ > + 0x00 0x38040000 0x0 0x00040000>; /* iATU_DMA reg space (256K) */ > + reg-names = "appl", "config", "atu_dma"; > + > + #address-cells = <3>; > + #size-cells = <2>; > + device_type = "pci"; > + num-lanes = <8>; > + linux,pci-domain = <0>; > + > + clocks = <&bpmp TEGRA194_CLK_PEX0_CORE_0>; > + clock-names = "core"; > + > + resets = <&bpmp TEGRA194_RESET_PEX0_CORE_0_APB>, > + <&bpmp TEGRA194_RESET_PEX0_CORE_0>; > + reset-names = "core_apb", "core"; > + > + interrupts = , /* controller interrupt */ > + ; /* MSI interrupt */ > + interrupt-names = "intr", "msi"; > + > + #interrupt-cells = <1>; > + interrupt-map-mask = <0 0 0 0>; > + interrupt-map = <0 0 0 0 &gic 0 72 0x04>; > + > + nvidia,bpmp = <&bpmp>; Need to update the example here. With that, Reviewed-by: Rob Herring 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=-5.5 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH, URIBL_BLOCKED,USER_AGENT_MUTT autolearn=unavailable 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 8E6EAC072B5 for ; Fri, 24 May 2019 20:26:48 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5E49320868 for ; Fri, 24 May 2019 20:26:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="TyNE4G/E" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5E49320868 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=i52alQNRIA5+iRNhHRv4YVWTM+sm3xv7d0j1uczJtTk=; b=TyNE4G/EbL9MhW 32xK8JFn9hng2faRobkQ8eyNCTurKd2zlczQlRyWF85AyXBhbLM47Co5l2QkadT7sEx5ARgj1mmSo to3dEf/eU/kT8hT2r+0vZGQIOybUAVRJ58/nRqLsa17tJfV4fcyG3ytMqdo+mifDt9wnTUKtK6tBo Fac+ON0smbUHyWhl74D040aJhnn2XqGxDaJGs0EMmPOmZCB0rfADCWIDE+R6QqDyA8fqItpAWzW+y AgfYsFk6yZbFV0z6N0ednLVi4XPCxXbSuA7bygbMsl/tD2YIVTUBB25yEWRc9Ls/hGJbT13fFss8i U8Ia0tw1gg1OjKqFgNRA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hUGm4-0006nk-9j; Fri, 24 May 2019 20:26:44 +0000 Received: from mail-ot1-f67.google.com ([209.85.210.67]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1hUGm0-0006mc-B2 for linux-arm-kernel@lists.infradead.org; Fri, 24 May 2019 20:26:42 +0000 Received: by mail-ot1-f67.google.com with SMTP id l25so9821666otp.8 for ; Fri, 24 May 2019 13:26:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=mvBAwt9WWubdl7IYzZOmu14RUPxpDepEHFKYmJGI5ak=; b=HWoTh91V1F/v7nN2e9Zd8jVALAmIOsIuBkZUBz02uj2kQnUG/tIsXEOhlWUzQHAy7c 2cnGSnuDxFttr3atfDq2qGUrbYDSuqsV36ym1rz7qe4C+BcXeknsimI1UJMXYWPB3n/l CT7jZg75/0Cw5Bj8qJOubRVvwh37S5JPA0zsho5mhBSh59SRAuR3hLLc7g5CFJ7QQJeW VYi/tSD377DjqBaXZMFd0Q9Kgmtac34XExYpBO5cbG5u6sj8ePw/oPE/RLcHNO2ydrvD URmHl18Q2wLzxG6RCrKlPoCENg8SfvXsZmHKCYGQPY1mZZbphdtxU9yUR5YWTqngJCHT 9JJQ== X-Gm-Message-State: APjAAAUtpuTMRg4ijQ7zEqVJGOXFsiwPXza8xMf/B+bIWdQ/mxDSeOdK hApos79PC/ZWZOxstyJqWw== X-Google-Smtp-Source: APXvYqy+ITFT9EWaatWw4aVRJoU8lxKpaccY6Y5l4RFBY3ED4DWOYN8EPu9IXx9LjRH121uQLRD1VA== X-Received: by 2002:a9d:460d:: with SMTP id y13mr38482740ote.244.1558729599271; Fri, 24 May 2019 13:26:39 -0700 (PDT) Received: from localhost (24-155-109-49.dyn.grandenetworks.net. [24.155.109.49]) by smtp.gmail.com with ESMTPSA id l30sm1330746ota.63.2019.05.24.13.26.38 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 24 May 2019 13:26:38 -0700 (PDT) Date: Fri, 24 May 2019 15:26:37 -0500 From: Rob Herring To: Vidya Sagar Subject: Re: [PATCH V7 09/15] dt-bindings: PCI: tegra: Add device tree support for Tegra194 Message-ID: <20190524202637.GA24385@bogus> References: <20190517123846.3708-1-vidyas@nvidia.com> <20190517123846.3708-10-vidyas@nvidia.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190517123846.3708-10-vidyas@nvidia.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190524_132640_378365_78E077E0 X-CRM114-Status: GOOD ( 25.82 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, lorenzo.pieralisi@arm.com, mperttunen@nvidia.com, mmaddireddy@nvidia.com, linux-pci@vger.kernel.org, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, kthota@nvidia.com, kishon@ti.com, linux-tegra@vger.kernel.org, thierry.reding@gmail.com, gustavo.pimentel@synopsys.com, jingoohan1@gmail.com, bhelgaas@google.com, jonathanh@nvidia.com, linux-arm-kernel@lists.infradead.org, sagar.tv@gmail.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, May 17, 2019 at 06:08:40PM +0530, Vidya Sagar wrote: > Add support for Tegra194 PCIe controllers. These controllers are based > on Synopsys DesignWare core IP. > > Signed-off-by: Vidya Sagar > --- > Changes since [v6]: > * Changed description of the property "nvidia,bpmp". > * Removed property "nvidia,disable-aspm-states". > > Changes since [v5]: > * Removed 'max-link-speed' as it is going to be a common sub-system property > * Removed 'nvidia,init-link-speed' as there isn't much value addition > * Removed 'nvidia,wake-gpios' for now > * Addressed review comments from Thierry and Rob in general > > Changes since [v4]: > * None > > Changes since [v3]: > * None > > Changes since [v2]: > * Using only 'Cx' (x-being controller number) format to represent a controller > * Changed to 'value: description' format where applicable > * Changed 'nvidia,init-speed' to 'nvidia,init-link-speed' > * Provided more documentation for 'nvidia,init-link-speed' property > * Changed 'nvidia,pex-wake' to 'nvidia,wake-gpios' > > Changes since [v1]: > * Added documentation for 'power-domains' property > * Removed 'window1' and 'window2' properties > * Removed '_clk' and '_rst' from clock and reset names > * Dropped 'pcie' from phy-names > * Added entry for BPMP-FW handle > * Removed offsets for some of the registers and added them in code and would be pickedup based on > controller ID > * Changed 'nvidia,max-speed' to 'max-link-speed' and is made as an optional > * Changed 'nvidia,disable-clock-request' to 'supports-clkreq' with inverted operation > * Added more documentation for 'nvidia,update-fc-fixup' property > * Removed 'nvidia,enable-power-down' and 'nvidia,plat-gpios' properties > * Added '-us' to all properties that represent time in microseconds > * Moved P2U documentation to a separate file > > .../bindings/pci/nvidia,tegra194-pcie.txt | 158 ++++++++++++++++++ > 1 file changed, 158 insertions(+) > create mode 100644 Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt > > diff --git a/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt b/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt > new file mode 100644 > index 000000000000..0119f40bbd11 > --- /dev/null > +++ b/Documentation/devicetree/bindings/pci/nvidia,tegra194-pcie.txt > @@ -0,0 +1,158 @@ > +NVIDIA Tegra PCIe controller (Synopsys DesignWare Core based) > + > +This PCIe host controller is based on the Synopsis Designware PCIe IP > +and thus inherits all the common properties defined in designware-pcie.txt. > + > +Required properties: > +- compatible: For Tegra19x, must contain "nvidia,tegra194-pcie". > +- device_type: Must be "pci" > +- power-domains: A phandle to the node that controls power to the respective > + PCIe controller and a specifier name for the PCIe controller. Following are > + the specifiers for the different PCIe controllers > + TEGRA194_POWER_DOMAIN_PCIEX8B: C0 > + TEGRA194_POWER_DOMAIN_PCIEX1A: C1 > + TEGRA194_POWER_DOMAIN_PCIEX1A: C2 > + TEGRA194_POWER_DOMAIN_PCIEX1A: C3 > + TEGRA194_POWER_DOMAIN_PCIEX4A: C4 > + TEGRA194_POWER_DOMAIN_PCIEX8A: C5 > + these specifiers are defined in > + "include/dt-bindings/power/tegra194-powergate.h" file. > +- reg: A list of physical base address and length pairs for each set of > + controller registers. Must contain an entry for each entry in the reg-names > + property. > +- reg-names: Must include the following entries: > + "appl": Controller's application logic registers > + "config": As per the definition in designware-pcie.txt > + "atu_dma": iATU and DMA registers. This is where the iATU (internal Address > + Translation Unit) registers of the PCIe core are made available > + for SW access. > + "dbi": The aperture where root port's own configuration registers are > + available > +- interrupts: A list of interrupt outputs of the controller. Must contain an > + entry for each entry in the interrupt-names property. > +- interrupt-names: Must include the following entries: > + "intr": The Tegra interrupt that is asserted for controller interrupts > + "msi": The Tegra interrupt that is asserted when an MSI is received > +- bus-range: Range of bus numbers associated with this controller > +- #address-cells: Address representation for root ports (must be 3) > + - cell 0 specifies the bus and device numbers of the root port: > + [23:16]: bus number > + [15:11]: device number > + - cell 1 denotes the upper 32 address bits and should be 0 > + - cell 2 contains the lower 32 address bits and is used to translate to the > + CPU address space > +- #size-cells: Size representation for root ports (must be 2) > +- ranges: Describes the translation of addresses for root ports and standard > + PCI regions. The entries must be 7 cells each, where the first three cells > + correspond to the address as described for the #address-cells property > + above, the fourth and fifth cells are for the physical CPU address to > + translate to and the sixth and seventh cells are as described for the > + #size-cells property above. > + - Entries setup the mapping for the standard I/O, memory and > + prefetchable PCI regions. The first cell determines the type of region > + that is setup: > + - 0x81000000: I/O memory region > + - 0x82000000: non-prefetchable memory region > + - 0xc2000000: prefetchable memory region > + Please refer to the standard PCI bus binding document for a more detailed > + explanation. > +- #interrupt-cells: Size representation for interrupts (must be 1) > +- interrupt-map-mask and interrupt-map: Standard PCI IRQ mapping properties > + Please refer to the standard PCI bus binding document for a more detailed > + explanation. > +- clocks: Must contain an entry for each entry in clock-names. > + See ../clocks/clock-bindings.txt for details. > +- clock-names: Must include the following entries: > + - core > +- resets: Must contain an entry for each entry in reset-names. > + See ../reset/reset.txt for details. > +- reset-names: Must include the following entries: > + - core_apb > + - core > +- phys: Must contain a phandle to P2U PHY for each entry in phy-names. > +- phy-names: Must include an entry for each active lane. > + "p2u-N": where N ranges from 0 to one less than the total number of lanes > +- nvidia,bpmp: Must contain a pair of phandle to BPMP controller node followed > + by controller-id. Following are the controller ids for each controller. > + 0: C0 > + 1: C1 > + 2: C2 > + 3: C3 > + 4: C4 > + 5: C5 > +- vddio-pex-ctl-supply: Regulator supply for PCIe side band signals > + > +Optional properties: > +- supports-clkreq: Refer to Documentation/devicetree/bindings/pci/pci.txt > +- nvidia,update-fc-fixup: This is a boolean property and needs to be present to > + improve perf when a platform is designed in such a way that it satisfies at > + least one of the following conditions thereby enabling root port to > + exchange optimum number of FC (Flow Control) credits with downstream devices > + 1. If C0/C4/C5 run at x1/x2 link widths (irrespective of speed and MPS) > + 2. If C0/C1/C2/C3/C4/C5 operate at their respective max link widths and > + a) speed is Gen-2 and MPS is 256B > + b) speed is >= Gen-3 with any MPS > +- "nvidia,aspm-cmrt-us": Common Mode Restore time for proper operation of ASPM > + to be specified in microseconds > +- "nvidia,aspm-pwr-on-t-us": Power On time for proper operation of ASPM to be > + specified in microseconds > +- "nvidia,aspm-l0s-entrance-latency-us": ASPM L0s entrance latency to be > + specified in microseconds > + > +Examples: > +========= > + > +Tegra194: > +-------- > + > +SoC DTSI: > + > + pcie@14180000 { > + compatible = "nvidia,tegra194-pcie", "snps,dw-pcie"; > + power-domains = <&bpmp TEGRA194_POWER_DOMAIN_PCIEX8B>; > + reg = <0x00 0x14180000 0x0 0x00020000 /* appl registers (128K) */ > + 0x00 0x38000000 0x0 0x00040000 /* configuration space (256K) */ > + 0x00 0x38040000 0x0 0x00040000>; /* iATU_DMA reg space (256K) */ > + reg-names = "appl", "config", "atu_dma"; > + > + #address-cells = <3>; > + #size-cells = <2>; > + device_type = "pci"; > + num-lanes = <8>; > + linux,pci-domain = <0>; > + > + clocks = <&bpmp TEGRA194_CLK_PEX0_CORE_0>; > + clock-names = "core"; > + > + resets = <&bpmp TEGRA194_RESET_PEX0_CORE_0_APB>, > + <&bpmp TEGRA194_RESET_PEX0_CORE_0>; > + reset-names = "core_apb", "core"; > + > + interrupts = , /* controller interrupt */ > + ; /* MSI interrupt */ > + interrupt-names = "intr", "msi"; > + > + #interrupt-cells = <1>; > + interrupt-map-mask = <0 0 0 0>; > + interrupt-map = <0 0 0 0 &gic 0 72 0x04>; > + > + nvidia,bpmp = <&bpmp>; Need to update the example here. With that, Reviewed-by: Rob Herring _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel