From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6C579C54EAA for ; Thu, 26 Jan 2023 10:19:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237104AbjAZKTJ (ORCPT ); Thu, 26 Jan 2023 05:19:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42670 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237053AbjAZKSg (ORCPT ); Thu, 26 Jan 2023 05:18:36 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7B13434323; Thu, 26 Jan 2023 02:18:09 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 177E661784; Thu, 26 Jan 2023 10:18:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id 6D8D8C433D2; Thu, 26 Jan 2023 10:18:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1674728284; bh=pzciJ25whFPqz74uOlgRGDuqRYmNEoQWXoTcFna1QFY=; h=From:Subject:Date:To:Cc:Reply-To:From; b=hZdxHHaxDaYMkWR4Dsc92+PD4/7yRWaqsMmPZ32h6TDmHzFcbjiVQMcq+w6FDbllr VxaXH3m8wmI7aagAs1K2xEL4tpSpAAiyWIzBeHJtLqxIIbUeLrcZU9+BB9540khTdO 1O61qD2E/0SHBPkjLLsBJR09HAWI2uVqcxdZeqxGogLTAFgiJopEZAAimPT9mhAm6u 9lgdNvQ4WNDBqvGYBVMt6HVahxhfp1I8Ndsohyt66bx4BD2sQd+aaNxzqi8+hV8jSf J36EpgcHpwMH6LA3KQfcKDAkP3kM9a/c8TqGWu3L8iKKJTUcbbW0UXQe94qSyX9Zxh zYpNbYs1y3l4g== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4FE4BC05027; Thu, 26 Jan 2023 10:18:04 +0000 (UTC) From: Niall Leonard via B4 Submission Endpoint Subject: [PATCH 0/3] Introduce new optional property to mark port as write only Date: Thu, 26 Jan 2023 10:17:21 +0000 Message-Id: <20230126-gpio-mmio-fix-v1-0-8a20ce0e8275@ncr.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIADFT0mMC/x2NwQqDQAxEf0VybmB3BcX+SukhrlFz2FWSUgTx3 xt7GXjMPOYEYxU2eDYnKH/FZKsO8dFAXqkujDI5QwqpDTF1uOyyYSkesxwYqRum0HIeuAd3RjL GUanm9bYK2Yf1LnZl3/+PXu/r+gFGFfWReAAAAA== To: Linus Walleij , Bartosz Golaszewski , Rob Herring , Krzysztof Kozlowski Cc: linux-gpio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Niall Leonard X-Mailer: b4 0.12.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1073; i=nl250060@ncr.com; h=from:subject:message-id; bh=pzciJ25whFPqz74uOlgRGDuqRYmNEoQWXoTcFna1QFY=; =?utf-8?q?b=3DowEBbQKS/ZANAwAKAVGiIrYFD2P/AcsmYgBj0lNaon7z7C7FVt2JLo+UquDFZ?= =?utf-8?q?/RQuxnhLYLH9Iop_+vBmomSJAjMEAAEKAB0WIQSha1EPjh6hUqdtwZNRoiK2BQ9j/?= =?utf-8?q?wUCY9JTWgAKCRBRoiK2BQ9j/31hD/_9kF/j2e0BCq4ghR3YP23h4YUDmJvks7EPxh?= =?utf-8?q?wxUpwTkoC7L8j/o4Yyz4JywsHPgy7IoQVrQTtq4v3N2_iIJsrkLMQ0an2mkLDDJJQ?= =?utf-8?q?yTJ+WgCSAapePZ4dwzAUeuEc07dsjQo3ga1Jgk1eAImi4nD3oyr1oPZkK_qdydor1?= =?utf-8?q?MGIjT9jz/YxqA84ryy2/fQMR/XImwF+p8nVYMCclpY4EXw/1ZHh0Pbvn46EUjooGU?= =?utf-8?q?3fCar6_zrKT4kOeBhq2tN1bfsu8f/r45uUQvd0ayzP5AGewqwsWJ4dEwDTNXS9Zx+?= =?utf-8?q?7tTeSaTiCa5y591ynvsx_LreJiLBI/KiYLV51ZSNiZPA2gsBgfx28or7ctXckxZ+l?= =?utf-8?q?n+Cdo5PR0/cBj5il3LeGIf3FYOrscF92n6_TUfSf8z0Lm5OFzwnKmzfaJAERhZtxE?= =?utf-8?q?kvu6FkNncSDeZyocZKsW8WBvoajuioUpQg68Ffyz6kZqdr9/_nL9CRGXPuyG6p11S?= =?utf-8?q?fVdA5FaX5wNg65qtYTFs8WFyh6ZG6dRHSNFR+3Y40Bmv8RiTFHpc4AS9gp6AR/_JR?= =?utf-8?q?Yto98Jy7h3WkIZKeFihiJb4gzibEpq3xvucFZXN/iU03yfp89IFY2PfhmRxZlif9i?= =?utf-8?q?3ohjqoLpj0B?= tRUlpjZCr+lujPwLp1liYMuRbjv5rExOyMxh0uHSGYMY0p0crJFK88ti6dMg== X-Developer-Key: i=nl250060@ncr.com; a=openpgp; fpr=A16B510F8E1EA152A76DC19351A222B6050F63FF X-Endpoint-Received: by B4 Submission Endpoint for nl250060@ncr.com/default with auth_id=26 X-Original-From: Niall Leonard Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some electronics do not allow the data regsister to be read. Reading the register can corrupt the output. This makes it impossible to read the last data written to the port. The existing shadow data register 'bgpio_data' can be used to allow the last written value to be returned by the read operation in this scenario. This is enabled for a particular port using a new flag and a new device tree property. Signed-off-by: Niall Leonard --- Niall Leonard (3): gpio: dt-bindings: add new property to wd,mbl-gpio bindings gpio: Add new flag BGPIOF_NO_INPUT gpio: mmio: Use new flag BGPIOF_NO_INPUT .../devicetree/bindings/gpio/wd,mbl-gpio.txt | 1 + drivers/gpio/gpio-mmio.c | 19 +++++++++++++++++-- include/linux/gpio/driver.h | 1 + 3 files changed, 19 insertions(+), 2 deletions(-) --- base-commit: 1b929c02afd37871d5afb9d498426f83432e71c2 change-id: 20230126-gpio-mmio-fix-1a69d03ec9e7 Best regards, -- Niall Leonard