From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754017AbeDYMzg (ORCPT ); Wed, 25 Apr 2018 08:55:36 -0400 Received: from fllnx209.ext.ti.com ([198.47.19.16]:15262 "EHLO fllnx209.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751525AbeDYMz1 (ORCPT ); Wed, 25 Apr 2018 08:55:27 -0400 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 04/15] ARM: dts: dra74x-mmc-iodelay: Add a new pinctrl group for clk line without pullup Date: Wed, 25 Apr 2018 18:24:38 +0530 Message-ID: <20180425125449.19755-5-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 Content-Type: text/plain X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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/dra74x-mmc-iodelay.dtsi | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/arm/boot/dts/dra74x-mmc-iodelay.dtsi b/arch/arm/boot/dts/dra74x-mmc-iodelay.dtsi index 28ebb4eb884a..30af5a03a852 100644 --- a/arch/arm/boot/dts/dra74x-mmc-iodelay.dtsi +++ b/arch/arm/boot/dts/dra74x-mmc-iodelay.dtsi @@ -49,6 +49,17 @@ >; }; + 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_sdr12: mmc1_pins_sdr12 { pinctrl-single,pins = < DRA7XX_CORE_IOPAD(0x3754, PIN_INPUT_PULLUP | MUX_MODE0) /* mmc1_clk.clk */ -- 2.17.0