From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S970375AbdAEJeI (ORCPT ); Thu, 5 Jan 2017 04:34:08 -0500 Received: from lucky1.263xmail.com ([211.157.147.134]:57418 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757464AbdAEJd2 (ORCPT ); Thu, 5 Jan 2017 04:33:28 -0500 X-263anti-spam: KSV:0; X-MAIL-GRAY: 1 X-MAIL-DELIVERY: 0 X-KSVirus-check: 0 X-ABS-CHECKED: 4 X-RL-SENDER: shawn.lin@rock-chips.com X-FST-TO: kishon@ti.com X-SENDER-IP: 58.22.7.114 X-LOGIN-NAME: shawn.lin@rock-chips.com X-UNIQUE-TAG: X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 From: Shawn Lin To: Kishon Vijay Abraham I Cc: Rob Herring , devicetree@vger.kernel.org, linux-rockchip@lists.infradead.org, Heiko Stuebner , Douglas Anderson , linux-kernel@vger.kernel.org, Shawn Lin Subject: [PATCH 1/2] Documentation: phy: introduce new optional property to specify drive impedance Date: Thu, 5 Jan 2017 17:31:21 +0800 Message-Id: <1483608682-226716-1-git-send-email-shawn.lin@rock-chips.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We need to modify the drive impedance according to the different hardware condition. So let's expose this to the DT. Signed-off-by: Shawn Lin --- Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt index e3ea557..731aeb9 100644 --- a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt +++ b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt @@ -14,6 +14,11 @@ specified by name: access to it), it is strongly suggested. - clocks: Should have a phandle to the card clock exported by the SDHCI driver. +Optional Properties: +- drive_impedance: Must be one of 33, 40, 50, 66, 100. This property allows + different boards to specify their own drive impedance depending on the + hardware condition. + Example: -- 1.9.1