From patchwork Sat May 8 20:56:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lucas Stach X-Patchwork-Id: 12246251 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A89D7C433B4 for ; Sat, 8 May 2021 21:06:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 85A81610CD for ; Sat, 8 May 2021 21:06:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229522AbhEHVHl (ORCPT ); Sat, 8 May 2021 17:07:41 -0400 Received: from ns.lynxeye.de ([87.118.118.114]:40619 "EHLO lynxeye.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S229559AbhEHVHk (ORCPT ); Sat, 8 May 2021 17:07:40 -0400 Received: by lynxeye.de (Postfix, from userid 501) id 0DA46E7425C; Sat, 8 May 2021 22:57:03 +0200 (CEST) Received: from astat.fritz.box (a89-183-71-68.net-htp.de [89.183.71.68]) by lynxeye.de (Postfix) with ESMTPA id B0865E74214; Sat, 8 May 2021 22:57:02 +0200 (CEST) From: Lucas Stach To: Rob Herring , Ulf Hansson , Adrian Hunter Cc: Pengutronix Kernel Team , Fabio Estevam , linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 1/2] dt-bindings: mmc: add no-mmc-hs400 flag Date: Sat, 8 May 2021 22:56:57 +0200 Message-Id: <20210508205658.91105-1-dev@lynxeye.de> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org HS400 requires a data strobe line in addition to the other MMC signal lines, so if a board design neglects to wire up this signal, HS400 mode is no available, even if both the controller and the eMMC are claiming to support this mode. Add a DT flag to allow boards to disable the HS400 support in this case. Signed-off-by: Lucas Stach Acked-by: Rob Herring --- Documentation/devicetree/bindings/mmc/mmc-controller.yaml | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml index e141330c1114..ac80d09df3a9 100644 --- a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml +++ b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml @@ -220,6 +220,11 @@ properties: description: eMMC HS400 enhanced strobe mode is supported + no-mmc-hs400: + $ref: /schemas/types.yaml#/definitions/flag + description: + All eMMC HS400 modes are not supported. + dsr: description: Value the card Driver Stage Register (DSR) should be programmed