From patchwork Mon Dec 12 18:07:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sudip Mukherjee X-Patchwork-Id: 13071310 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 B8D6CC2D0CB for ; Mon, 12 Dec 2022 18:08:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233258AbiLLSIl (ORCPT ); Mon, 12 Dec 2022 13:08:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34206 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233274AbiLLSIN (ORCPT ); Mon, 12 Dec 2022 13:08:13 -0500 Received: from mail-wm1-x334.google.com (mail-wm1-x334.google.com [IPv6:2a00:1450:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CA95221B9 for ; Mon, 12 Dec 2022 10:07:42 -0800 (PST) Received: by mail-wm1-x334.google.com with SMTP id ay8-20020a05600c1e0800b003d0808d2826so9932766wmb.1 for ; Mon, 12 Dec 2022 10:07:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=MsnaVNQZa+bH87IGKD3eNLndnfCgVPoadhiR+NchvNE=; b=MT58fo+ATFwyk3UB1TFDLScBKvBdngb9oD90Zf8vqqvtOuqyd99P5DB/6HSLC/k1FK s8e5ZSr2YOf2rZpDKdRtmujoDYCTHOQmKo3x4IUb+RGcv1OKXogUN0uosW1tbZ77FIvM A3rL97Yu2DvehEAOBsg6ajZcxFsAIl/vJf7ax9MBPYkl6Wb9FVLSBHZeFTXJJfjjRIge dJgSkpAAiD0F+k4D5eNxeMKWlsYbeHcHyOZDjCGuyG+98ahJ6AApDER7xde9xo1jVGbG HHlDmO9vnVgR882LgOKyeYzuqrVBJNXudtHhYAqyp39K10HQRCrg9l3X1qMdFYXG7gA/ kHUA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=MsnaVNQZa+bH87IGKD3eNLndnfCgVPoadhiR+NchvNE=; b=CpF9Dkq6OWLNECPzRiREUaWC7TQfg+VItlq7c/lN8zvR8+g2aFqOv58qlbVBUgE73o Z1GeVscwXNunlWRkipqcFSHf+zSgzfRCsvG/nJ6/D366a6S0PramfRZdTRhBODN8vx/i wYNzF+1N1IPUofpDqHoe7nOl7zCPUUSkaJ3i+hS5PF9Ne8WgjSEgawIgRK/j/ayqwLg4 NwKC1+BGDFZmOO6eqolCV/PUKqfqkzZe8771n0lma/Q61B/54cq6Pvxewt7xWPNiQBAS qJimvstdAIhh3oI48PHhcdDU2Wo8iQCZl3o5fsUxTLVwCKi0zgRFp69X7EJVIWABhn8l d7SA== X-Gm-Message-State: ANoB5pnMEFR06cqoZPLwroXBsXEJCYV5NtsLoHBgc80UorfM6PXiaWvJ PEjUfFfA07PThg4iwiqXwz13fA== X-Google-Smtp-Source: AA0mqf5PnTDqvX0IOnkaB4yW9YsKVl/w+0U3ILEYH/VWAetLNkr+dG+H1b5iE3e9mPj0f87dcdIZhg== X-Received: by 2002:a05:600c:1c21:b0:3d0:6ef9:9f2c with SMTP id j33-20020a05600c1c2100b003d06ef99f2cmr13333276wms.16.1670868461400; Mon, 12 Dec 2022 10:07:41 -0800 (PST) Received: from localhost.localdomain (host-78-150-37-98.as13285.net. [78.150.37.98]) by smtp.gmail.com with ESMTPSA id t123-20020a1c4681000000b003a3170a7af9sm10156808wma.4.2022.12.12.10.07.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Dec 2022 10:07:40 -0800 (PST) From: Sudip Mukherjee To: Serge Semin , Mark Brown , Rob Herring , Krzysztof Kozlowski Cc: jude.onyenegecha@sifive.com, ben.dooks@sifive.com, jeegar.lakhani@sifive.com, linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Sudip Mukherjee Subject: [PATCH v2 00/15] Add support for enhanced SPI for Designware SPI controllers Date: Mon, 12 Dec 2022 18:07:17 +0000 Message-Id: <20221212180732.79167-1-sudip.mukherjee@sifive.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org The is v2 of the patch series adding enhanced SPI support. Some Synopsys SSI controllers support enhanced SPI which includes Dual mode, Quad mode and Octal mode. DWC_ssi includes clock stretching feature in enhanced SPI modes which can be used to prevent FIFO underflow and overflow conditions while transmitting or receiving the data respectively. This is almost a complete rework based on the review from Serge.