From patchwork Thu Jul 26 12:26:51 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aapo Vienamo X-Patchwork-Id: 10545757 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DCA5814BC for ; Thu, 26 Jul 2018 12:28:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CAA522B0A7 for ; Thu, 26 Jul 2018 12:28:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BE55F2B0F1; Thu, 26 Jul 2018 12:28:21 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, 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 576E42B0A7 for ; Thu, 26 Jul 2018 12:28:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730827AbeGZNn4 (ORCPT ); Thu, 26 Jul 2018 09:43:56 -0400 Received: from hqemgate16.nvidia.com ([216.228.121.65]:12220 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730175AbeGZNny (ORCPT ); Thu, 26 Jul 2018 09:43:54 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1, AES128-SHA) id ; Thu, 26 Jul 2018 05:27:06 -0700 Received: from HQMAIL108.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Thu, 26 Jul 2018 05:27:17 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Thu, 26 Jul 2018 05:27:17 -0700 Received: from HQMAIL102.nvidia.com (172.18.146.10) by HQMAIL108.nvidia.com (172.18.146.13) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Thu, 26 Jul 2018 12:27:16 +0000 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQMAIL102.nvidia.com (172.18.146.10) with Microsoft SMTP Server (TLS) id 15.0.1347.2 via Frontend Transport; Thu, 26 Jul 2018 12:27:16 +0000 Received: from dhcp-10-21-25-168.Nvidia.com (Not Verified[10.21.25.201]) by hqnvemgw01.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Thu, 26 Jul 2018 05:27:16 -0700 From: Aapo Vienamo To: Ulf Hansson , Rob Herring , Mark Rutland , Thierry Reding , Jonathan Hunter , Adrian Hunter , Mikko Perttunen CC: , , , , Aapo Vienamo Subject: [PATCH v2 05/10] dt-bindings: Add Tegra SDHCI pad pdpu offset bindings Date: Thu, 26 Jul 2018 15:26:51 +0300 Message-ID: <1532608016-14319-6-git-send-email-avienamo@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1532608016-14319-1-git-send-email-avienamo@nvidia.com> References: <1532608016-14319-1-git-send-email-avienamo@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 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 Add bindings documentation for pad pull up and pull down offset values to be programmed before executing automatic pad drive strength calibration. Signed-off-by: Aapo Vienamo --- .../bindings/mmc/nvidia,tegra20-sdhci.txt | 34 ++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt index 95010cf..c3d8a15 100644 --- a/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt +++ b/Documentation/devicetree/bindings/mmc/nvidia,tegra20-sdhci.txt @@ -24,6 +24,7 @@ Required properties: Optional properties: - power-gpios : Specify GPIOs for power control +Optional properties for Tegra210 and Tegra186: Example: sdhci@c8000200 { @@ -47,6 +48,35 @@ Optional properties for Tegra210 and Tegra186: pinctrl-1. - nvidia,only-1-8-v : The presence of this property indicates that the controller operates at a 1.8 V fixed I/O voltage. +- nvidia,pad-autocal-pull-up-offset-3v3, + nvidia,pad-autocal-pull-down-offset-3v3 : Specify drive strength + calibration offsets for 3.3 V signaling modes. +- nvidia,pad-autocal-pull-up-offset-1v8, + nvidia,pad-autocal-pull-down-offset-1v8 : Specify drive strength + calibration offsets for 1.8 V signaling modes. +- nvidia,pad-autocal-pull-up-offset-3v3-timeout, + nvidia,pad-autocal-pull-down-offset-3v3-timeout : Specify drive + strength used as a fallback in case the automatic calibration times + out on a 3.3 V signaling mode. +- nvidia,pad-autocal-pull-up-offset-1v8-timeout, + nvidia,pad-autocal-pull-down-offset-1v8-timeout : Specify drive + strength used as a fallback in case the automatic calibration times + out on a 1.8 V signaling mode. +- nvidia,pad-autocal-pull-up-offset-sdr104, + nvidia,pad-autocal-pull-down-offset-sdr104 : Specify drive strength + calibration offsets for SDR104 mode. +- nvidia,pad-autocal-pull-up-offset-hs400, + nvidia,pad-autocal-pull-down-offset-hs400 : Specify drive strength + calibration offsets for HS400 mode. + + Notes on the pad calibration pull up and pulldown offset values: + - The property values are drive codes which are programmed into the + PD_OFFSET and PU_OFFSET sections of the + SDHCI_TEGRA_AUTO_CAL_CONFIG register. + - A higher value corresponds to higher drive strength. Please refer + to the reference manual of the SoC for correct values. + - The SDR104 and HS400 timing specific values are used in + corresponding modes if specified. Example: sdhci@700b0000 { @@ -60,5 +90,9 @@ sdhci@700b0000 { pinctrl-names = "sdmmc-3v3", "sdmmc-1v8"; pinctrl-0 = <&sdmmc1_3v3>; pinctrl-1 = <&sdmmc1_1v8>; + pad-autocal-pull-up-offset-3v3 = <0x00>; + pad-autocal-pull-down-offset-3v3 = <0x7d>; + pad-autocal-pull-up-offset-1v8 = <0x7b>; + pad-autocal-pull-down-offset-1v8 = <0x7b>; status = "disabled"; };