From patchwork Mon Mar 5 14:48:43 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 10259167 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id E8CE160365 for ; Mon, 5 Mar 2018 14:49:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D98C628A77 for ; Mon, 5 Mar 2018 14:49:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CC1B928A94; Mon, 5 Mar 2018 14:49:56 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 488F328A8F for ; Mon, 5 Mar 2018 14:49:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932207AbeCEOtz (ORCPT ); Mon, 5 Mar 2018 09:49:55 -0500 Received: from szxga04-in.huawei.com ([45.249.212.190]:6145 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932106AbeCEOtx (ORCPT ); Mon, 5 Mar 2018 09:49:53 -0500 Received: from DGGEMS412-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 5171F1AF4B58D; Mon, 5 Mar 2018 22:49:34 +0800 (CST) Received: from localhost.localdomain (10.67.212.75) by DGGEMS412-HUB.china.huawei.com (10.3.19.212) with Microsoft SMTP Server id 14.3.361.1; Mon, 5 Mar 2018 22:49:26 +0800 From: John Garry To: , , , CC: , , , , Xiaofei Tan , John Garry Subject: [PATCH v3 1/8] dt-bindings: scsi: hisi_sas: add an property of signal attenuation Date: Mon, 5 Mar 2018 22:48:43 +0800 Message-ID: <1520261330-204596-2-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1520261330-204596-1-git-send-email-john.garry@huawei.com> References: <1520261330-204596-1-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.67.212.75] X-CFilter-Loop: Reflected Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Xiaofei Tan For some new boards with hip07 chipset we are required to set PHY config registers differently. The hw property which determines how to set these registers is in the PHY signal attenuation readings. This patch add an devicetree property, "hisilicon,signal-attenuation", which is used to describe the signal attenuation of an board. Cc: Rob Herring Cc: Mark Rutland Signed-off-by: Xiaofei Tan Signed-off-by: John Garry --- Documentation/devicetree/bindings/scsi/hisilicon-sas.txt | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/devicetree/bindings/scsi/hisilicon-sas.txt b/Documentation/devicetree/bindings/scsi/hisilicon-sas.txt index df3bef7..8c6659e 100644 --- a/Documentation/devicetree/bindings/scsi/hisilicon-sas.txt +++ b/Documentation/devicetree/bindings/scsi/hisilicon-sas.txt @@ -53,6 +53,13 @@ Main node required properties: Optional main node properties: - hip06-sas-v2-quirk-amt : when set, indicates that the v2 controller has the "am-max-transmissions" limitation. + - hisilicon,signal-attenuation : array of 3 32-bit values, containing de-emphasis, + preshoot, and boost attenuation readings for the board. They + are used to describe the signal attenuation of the board. These + values' range is 7600 to 12400, and used to represent -24dB to + 24dB. + The formula is "y = (x-10000)/10000". For example, 10478 + means 4.78dB. Example: sas0: sas@c1000000 {