From patchwork Tue Sep 15 18:14:58 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Fainelli X-Patchwork-Id: 518071 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 0D5A6140180 for ; Wed, 16 Sep 2015 04:18:50 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b=Kq09LRSx; dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751904AbbIOSSt (ORCPT ); Tue, 15 Sep 2015 14:18:49 -0400 Received: from mail-pa0-f51.google.com ([209.85.220.51]:34012 "EHLO mail-pa0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751699AbbIOSSs (ORCPT ); Tue, 15 Sep 2015 14:18:48 -0400 Received: by padhy16 with SMTP id hy16so183319751pad.1 for ; Tue, 15 Sep 2015 11:18:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=CH+C1wFzGe4Vq4Q8IPfGAMBMz3YOfuIiMSfCk6Ibx/Y=; b=Kq09LRSxYyWnHFgPyya38KotkXlpi523J5Z+mIrGnq9MeNLJX7+1k9uzt/z0Dxob3R JpiqPoknaCb2uGQTbAEVFMhnMAEo/qssUeg9z0QV7EZQf9UGqxBAKD1PgiYsM6uyjfnX dQQ3DV6/qr20W6sH1huAY1KcaKLzv6ibCtjfR3fP3UAuVaNpGvmfXZ7ROXiEu1NaUEtX dzOF55VHLaUhnadYw5h6WID5RsPQeiDHIxvfKUHL3aXxOcbGd3HF1FfoCW4+bB7qJ5ER viSIQlidh3ZcxKLhbPqmPef4Xy4Xgr5BO5w1xpzH/G0cp4oZ9K+oGJZwCzXjoRlNALto Vx6Q== X-Received: by 10.68.248.102 with SMTP id yl6mr50481049pbc.66.1442341128119; Tue, 15 Sep 2015 11:18:48 -0700 (PDT) Received: from fainelli-desktop.broadcom.com (5520-maca-inet1-outside.broadcom.com. [216.31.211.11]) by smtp.gmail.com with ESMTPSA id bz4sm23381169pbd.6.2015.09.15.11.18.47 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 15 Sep 2015 11:18:47 -0700 (PDT) From: Florian Fainelli To: linux-arm-kernel@lists.infradead.org Cc: devicetree@vger.kernel.org, robh@kernel.org, computersforpeace@gmail.com, gregory.0xf0@gmail.com, bcm-kernel-feedback-list@broadcom.com, Florian Fainelli Subject: [PATCH v2 1/3] Documentation: bindings: brcmstb: Document write-pairing Date: Tue, 15 Sep 2015 11:14:58 -0700 Message-Id: <1442340900-15320-2-git-send-email-f.fainelli@gmail.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1442340900-15320-1-git-send-email-f.fainelli@gmail.com> References: <1442340900-15320-1-git-send-email-f.fainelli@gmail.com> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Document the hif-cpubiuctrl node a bit more, and add a documentation entry for the optional "brcm,write-pairing" property. Signed-off-by: Florian Fainelli Acked-by: Gregory Fong --- Changes in v2: - added a description of what the BIU stands for and what write pairing is - fixed the compatible string description .../devicetree/bindings/arm/bcm/brcm,brcmstb.txt | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt b/Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt index 430608ec09f0..8ac28eb4a5a1 100644 --- a/Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt +++ b/Documentation/devicetree/bindings/arm/bcm/brcm,brcmstb.txt @@ -20,6 +20,25 @@ system control is required: - compatible: "brcm,bcm-hif-cpubiuctrl", "syscon" - compatible: "brcm,bcm-hif-continuation", "syscon" +hif-cpubiuctrl node +------------------- +SoCs with Broadcom Brahma15 ARM-based CPUs have a specific Bus Interface Unit +(BIU) block which controls and interfaces the CPU complex to the different +Memory Controller Ports (MCP), one per memory controller (MEMC). This BIU block +offers a feature called Write Pairing which consists in collapsing two adjacent +cache lines into a single (bursted) write transaction towards the memory +controller (MEMC) to maximize write bandwidth. + +Required properties: + + - compatible: must be "brcm,bcm7445-hif-cpubiuctrl", "syscon" + +Optional properties: + + - brcm,write-pairing: + Boolean property, which when present indicates that the chip + supports write-pairing. + example: rdb { #address-cells = <1>; @@ -35,6 +54,7 @@ example: hif_cpubiuctrl: syscon@3e2400 { compatible = "brcm,bcm7445-hif-cpubiuctrl", "syscon"; reg = <0x3e2400 0x5b4>; + brcm,write-pairing; }; hif_continuation: syscon@452000 {