From patchwork Wed Apr 25 12:54:39 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kishon Vijay Abraham I X-Patchwork-Id: 10363093 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 5DE396038F for ; Wed, 25 Apr 2018 12:58:32 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4DC0928DAD for ; Wed, 25 Apr 2018 12:58:32 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 42C2228DB5; Wed, 25 Apr 2018 12:58:32 +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=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI, T_DKIM_INVALID 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 BEAE328DAD for ; Wed, 25 Apr 2018 12:58:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754111AbeDYMz7 (ORCPT ); Wed, 25 Apr 2018 08:55:59 -0400 Received: from fllnx209.ext.ti.com ([198.47.19.16]:15285 "EHLO fllnx209.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753354AbeDYMzx (ORCPT ); Wed, 25 Apr 2018 08:55:53 -0400 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by fllnx209.ext.ti.com (8.15.1/8.15.1) with ESMTP id w3PCtN0K024426; Wed, 25 Apr 2018 07:55:23 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ti.com; s=ti-com-17Q1; t=1524660923; bh=9iJPrhsmwWZn4+54sd6nnY9SVFPKFEx8O6NDd6WXnZc=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=VGyXBPO2qK081uy4R4ISGPp/CW4matDzB7alyibmug62QUyKzX8TwuQyy1hqH0F86 JQ6juTYLiYU6NTeaW5FBeqYtzZZjGBxWhwF8UuG2vuX2CmfFU7MQ2ZeI3yO3s/0I9N FTA7N4AsIR4Vc604fjFsy3O8i1mZ6ksTc/jxrn+c= Received: from DLEE103.ent.ti.com (dlee103.ent.ti.com [157.170.170.33]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id w3PCtN8E024326; Wed, 25 Apr 2018 07:55:23 -0500 Received: from DLEE109.ent.ti.com (157.170.170.41) by DLEE103.ent.ti.com (157.170.170.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1466.3; Wed, 25 Apr 2018 07:55:23 -0500 Received: from dlep32.itg.ti.com (157.170.170.100) by DLEE109.ent.ti.com (157.170.170.41) with Microsoft SMTP Server (version=TLS1_0, cipher=TLS_RSA_WITH_AES_256_CBC_SHA) id 15.1.1466.3 via Frontend Transport; Wed, 25 Apr 2018 07:55:23 -0500 Received: from a0393678ub.india.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dlep32.itg.ti.com (8.14.3/8.13.8) with ESMTP id w3PCt1SI021671; Wed, 25 Apr 2018 07:55:20 -0500 From: Kishon Vijay Abraham I To: =?UTF-8?q?Beno=C3=AEt=20Cousson=20?= , Tony Lindgren CC: Jonathan Corbet , Rob Herring , Mark Rutland , , , , , , Subject: [PATCH v3 05/15] ARM: dts: dra76x-mmc-iodelay: Add a new pinctrl group for clk line without pullup Date: Wed, 25 Apr 2018 18:24:39 +0530 Message-ID: <20180425125449.19755-6-kishon@ti.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180425125449.19755-1-kishon@ti.com> References: <20180425125449.19755-1-kishon@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP During a short period when the bus voltage is switched from 3.3v to 1.8v, (to enumerate UHS mode), the mmc module is disabled and the mmc IO lines are kept in a state according to the programmed pad mux pull type. According to 4.2.4.2 Timing to Switch Signal Voltage in "SD Specifications Part 1 Physical Layer Specification Version 5.00 February 22, 2016", the host should hold CLK line low for at least 5ms. In order to keep the card line low during voltage switch, the pad mux of mmc1_clk line should be configured to pull down. Add a new pinctrl group for clock line without pullup to be used in boards where mmc1_clk line is not connected to an external pullup. Signed-off-by: Kishon Vijay Abraham I --- arch/arm/boot/dts/dra76x-mmc-iodelay.dtsi | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/arm/boot/dts/dra76x-mmc-iodelay.dtsi b/arch/arm/boot/dts/dra76x-mmc-iodelay.dtsi index baba7b00eca7..b6327220a88e 100644 --- a/arch/arm/boot/dts/dra76x-mmc-iodelay.dtsi +++ b/arch/arm/boot/dts/dra76x-mmc-iodelay.dtsi @@ -38,6 +38,17 @@ >; }; + mmc1_pins_default_no_clk_pu: mmc1_pins_default_no_clk_pu { + pinctrl-single,pins = < + DRA7XX_CORE_IOPAD(0x3754, PIN_INPUT_PULLDOWN | MUX_MODE0) /* mmc1_clk.clk */ + DRA7XX_CORE_IOPAD(0x3758, PIN_INPUT_PULLUP | MUX_MODE0) /* mmc1_cmd.cmd */ + DRA7XX_CORE_IOPAD(0x375c, PIN_INPUT_PULLUP | MUX_MODE0) /* mmc1_dat0.dat0 */ + DRA7XX_CORE_IOPAD(0x3760, PIN_INPUT_PULLUP | MUX_MODE0) /* mmc1_dat1.dat1 */ + DRA7XX_CORE_IOPAD(0x3764, PIN_INPUT_PULLUP | MUX_MODE0) /* mmc1_dat2.dat2 */ + DRA7XX_CORE_IOPAD(0x3768, PIN_INPUT_PULLUP | MUX_MODE0) /* mmc1_dat3.dat3 */ + >; + }; + mmc1_pins_hs: mmc1_pins_hs { pinctrl-single,pins = < DRA7XX_CORE_IOPAD(0x3754, PIN_INPUT_PULLUP | MUX_VIRTUAL_MODE11 | MUX_MODE0) /* mmc1_clk.clk */