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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1B81210BA430 for ; Fri, 27 Mar 2026 07:05:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:References:To:From:Subject: Cc:Message-Id:Date:Mime-Version:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=XZpqvw14Kc6F7W9qCyFrc78QZP8/dXr8JUDux8NIwsg=; b=h8O6pBM5Wi3yb6 JwEWcKWy1Hb7yr4ymQXH0+nwUcQPr046tEIfmrWC5shvQeHF+/r+a1NxO02XiZL0cF3LIsYWRiBha psjHUZzeCQev1W0+lNwSfizCR7ZEFhzJp+m2u+aCgQ8t54QHjCXPAkTZ8gGCTbexfjMXYzWb3fYJy IG8kgrle3vGCWhsx54vlH/1vb0Ca83jgg2MmmF9ngGoBAXx0cJZMazlj+hMECfBU3Fc3wFsctG/vs xUwSeA1oSoQw1Fnui755sUoRtZXBKut4/1KnzQkrh/BE7H47TMo8/xmB5WO5CvxfIiel9IkJ7/7b8 tyjuIbBkt6xcW2sUJQ0Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1w61GD-00000006r8I-1XHn; Fri, 27 Mar 2026 07:05:37 +0000 Received: from smtpbg151.qq.com ([18.169.211.239]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1w61G9-00000006r6q-19R8 for linux-riscv@lists.infradead.org; Fri, 27 Mar 2026 07:05:35 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.spacemit.com; s=mxsw2412; t=1774595091; bh=C5sPPhxc2ESUsfKZcmePqfZSGtd39KSgY9EBT4h19Z4=; h=Mime-Version:Date:Message-Id:Subject:From:To; b=oJT4MR45zGFsDiQoi7e3V7hweAfxTuleEh3YMiT8E1pJVzLnTy7gQkvT3j/L9hsBT 8hOTgyJ3jYWn8Snir6f6LKegADFzc6U8jLNeX1bOOYZg5wbx4a2oQwhFloMOjjkgl8 dQsJpnoncULL7vYfFXAsEaGIh18sbWqT0gY9dWAI= X-QQ-mid: zesmtpsz9t1774595088tae86de95 X-QQ-Originating-IP: w/WyDemxcbjpJuaCt1YW/wsPI2c2ZYwcqhNJMRnh9EA= Received: from = ( [120.237.158.181]) by bizesmtp.qq.com (ESMTP) with id ; Fri, 27 Mar 2026 15:04:46 +0800 (CST) X-QQ-SSF: 0000000000000000000000000000000 X-QQ-GoodBg: 0 X-BIZMAIL-ID: 1752965271814094096 EX-QQ-RecipientCnt: 21 Mime-Version: 1.0 Date: Fri, 27 Mar 2026 15:04:46 +0800 Message-Id: Cc: "Rob Herring" , "Krzysztof Kozlowski" , "Conor Dooley" , "Paul Walmsley" , "Palmer Dabbelt" , "Albert Ou" , "Alexandre Ghiti" , "Yixun Lan" , "Vinod Koul" , "Frank Li" , "Guodong Xu" , "Michael Turquette" , "Stephen Boyd" , , , , , , Subject: Re: [PATCH v2 2/7] dt-bindings: dmaengine: Add SpacemiT K3 DMA compatible string From: "Troy Mitchell" To: "Conor Dooley" , "Troy Mitchell" X-Mailer: aerc 0.21.0-0-g5549850facc2 References: <20260326-k3-pdma-v2-0-ca94ca7bb595@linux.spacemit.com> <20260326-k3-pdma-v2-2-ca94ca7bb595@linux.spacemit.com> <20260326-explode-surplus-24c0e0813099@spud> In-Reply-To: <20260326-explode-surplus-24c0e0813099@spud> X-QQ-SENDSIZE: 520 Feedback-ID: zesmtpsz:linux.spacemit.com:qybglogicsvrgz:qybglogicsvrgz3a-0 X-QQ-XMAILINFO: McJfg7Aee/FZuqgBLJa/xaD93ptxSj5gtrQRlr2BHMhaSuQ7Hmc7FSVm nIbSM/Gn9ozMbLDAzyDH+vq5F/k9zjNFar+BG0Flj5Fv5Qb3kLBOQgep/HUvaEWm+0REQgk utQdzLZlWXNyZv2nn0GyzOdluz6WiLSYfnDkvmLzrjDA1IDE7LTjtyNcunyenvlBbjYaBL7 mEa7uvvsPio6wr4K+A8wHylXqbN1xA5Omj74pPKdJ+wtE1q9+WC3rVp1Ss5BsRB8d2ghPly NbCS9jz/nQTk4C2cOLP4oNcXZ+C7rrA3EYWGj3tICHboN6UMAl1rPf7fA6NKoqLBaPD6a6E b8X62kTE4p8pepTCHO0caY5TYjyPWGFznU+M06CCNS9yzqWnErMdhJQ0Pdnr5gazRMTq+kj bnz6JW7yTTJ0OBaE2grKZjRUb5XfmfCOPkzi6RQoXsJ34mtxevGQKnXfUufsCCM+TasNNYF bmlQf+G7vCOo+Rt952DsFtLZt4xuH05ppyLSgnFQOjXzZoj3TKEj6EOfwrfnivwaDImWGpm twhLEFYC552lvFErafayaB9W64nfLbRea2jgYNRNxNK5sckvJ7IXERvCT9xDZXp2JkrZ9Zb jqB9h5NezcuFHQzSd92GpEx4yB/mqPX325JDsllEaoxHm9z8tEJ1YK3mSklNr67A943Uze0 /Q/lTzNybK/WbckQe+DCVkk7TxkHPwmGxNgNiMgH8lSBQnZ+tTJKbnK8L+G8dDgusUS6Fps CIhnSCyOr1nlHKL/tWEwK2sBNzt6DfcW4XD37Cv9CTWqQgyThhGlnVSSivvBYDqR7pOlC9V herj0wt6QAME/Q62DeFPxjHm17xsYWWc9J2Eo8WvZYcI0n2BCp+4lN9f7mebQTwbtq/QSrg uzgfBsa5kTO7UaFg/BDsF3Ye+YSMuI7L7nG0z6YKHWVrcOUa2Ni5leJnuDmxQb7EAaY9Slv t0l42y7QZtI8y6/adItDuv1OjHxF5HeXI15wNe7gmfFLcCNbxu45AngCu038T5mo/mFAQcL DTr/SpmtZPiOILKrFUksajYQkjbJT0oAAB4HCDo8zzeQQm2O8g X-QQ-XMRINFO: Nq+8W0+stu50tPAe92KXseR0ZZmBTk3gLg== X-QQ-RECHKSPAM: 0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260327_000534_365048_077F5F0C X-CRM114-Status: UNSURE ( 7.62 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org Hi Conor, On Fri Mar 27, 2026 at 2:34 AM CST, Conor Dooley wrote: > On Thu, Mar 26, 2026 at 04:17:17PM +0800, Troy Mitchell wrote: >> From: Guodong Xu >> >> Add k3 compatible string. > > That's obvious. What you need to explain is why it is not compatible with > the existing k1. > Thanks for the review. The SpacemiT K3 PDMA requires a new compatible string because it is not fully backward compatible with the K1 implementation due to two main hardware differences: - Variable extended DRCMR base: The DRCMR (DMA Request/Command Register) base address for extended DMA request numbers (>= 64) is different in the K3 hardware implementation. - Memory addressing capabilities: Unlike the K1 SoC, where some DMA masters had memory addressing limitations (restricted to the 0-4GB space) and required a dedicated dma-bus, the K3 DMA masters have full memory addressing capabilities. I will update the commit message in the v3 series. -Troy _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv