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X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On 9/12/22 12:44, Patrice CHOTARD wrote: Hi! >> - /* 2 bytes per clock cycle in DTR mode. */ >> - op->dummy.nbytes *= 2; >> - > What is the benefit to remove dtr dummy.nbytes computation ? it leads to spray it in all drivers which support DTR. > It was simpler to let the framework to deal with it, have i missed something ? The majority of drivers from SPI need the number of cycles, not the number of bytes. JESD216 refers to dummy ncycles as well, there's no such thing as dummy nbytes. You'll notice that these drivers do the computation back to ncycles in their driver, thus they undo what's prepared in SPI NOR. There are just 4 drivers that use nbytes and rely on what's currently computed in SPI NOR. Since these 4 drivers don't use the standard parameter and require nbytes instead, they can do the conversion to nbytes in their driver. -- Cheers, ta ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/ 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 A5ED4ECAAA1 for ; Mon, 12 Sep 2022 11:04:11 +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:MIME-Version:Content-ID:In-Reply-To: References:Message-ID:Date:Subject:CC:To:From:Reply-To:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org On 9/12/22 12:44, Patrice CHOTARD wrote: Hi! >> - /* 2 bytes per clock cycle in DTR mode. */ >> - op->dummy.nbytes *= 2; >> - > What is the benefit to remove dtr dummy.nbytes computation ? it leads to spray it in all drivers which support DTR. > It was simpler to let the framework to deal with it, have i missed something ? The majority of drivers from SPI need the number of cycles, not the number of bytes. JESD216 refers to dummy ncycles as well, there's no such thing as dummy nbytes. You'll notice that these drivers do the computation back to ncycles in their driver, thus they undo what's prepared in SPI NOR. There are just 4 drivers that use nbytes and rely on what's currently computed in SPI NOR. Since these 4 drivers don't use the standard parameter and require nbytes instead, they can do the conversion to nbytes in their driver. -- Cheers, ta _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip 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 D5C78ECAAA1 for ; Mon, 12 Sep 2022 11:06:31 +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:MIME-Version:Content-ID:In-Reply-To: References:Message-ID:Date:Subject:CC:To:From:Reply-To:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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X-BeenThere: linux-arm-kernel@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-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 9/12/22 12:44, Patrice CHOTARD wrote: Hi! >> - /* 2 bytes per clock cycle in DTR mode. */ >> - op->dummy.nbytes *= 2; >> - > What is the benefit to remove dtr dummy.nbytes computation ? it leads to spray it in all drivers which support DTR. > It was simpler to let the framework to deal with it, have i missed something ? The majority of drivers from SPI need the number of cycles, not the number of bytes. JESD216 refers to dummy ncycles as well, there's no such thing as dummy nbytes. You'll notice that these drivers do the computation back to ncycles in their driver, thus they undo what's prepared in SPI NOR. There are just 4 drivers that use nbytes and rely on what's currently computed in SPI NOR. Since these 4 drivers don't use the standard parameter and require nbytes instead, they can do the conversion to nbytes in their driver. -- Cheers, ta _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 6A18BC6FA83 for ; Mon, 12 Sep 2022 12:49:42 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4MR5yr5pdmz3bdk for ; Mon, 12 Sep 2022 22:49:40 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; 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