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 3DB22C7EE2F for ; Fri, 3 Mar 2023 10:41:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229962AbjCCKlR (ORCPT ); Fri, 3 Mar 2023 05:41:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52416 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229792AbjCCKlQ (ORCPT ); Fri, 3 Mar 2023 05:41:16 -0500 Received: from mail-ed1-x536.google.com (mail-ed1-x536.google.com [IPv6:2a00:1450:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0C5395D447 for ; Fri, 3 Mar 2023 02:41:14 -0800 (PST) Received: by mail-ed1-x536.google.com with SMTP id i34so8440812eda.7 for ; Fri, 03 Mar 2023 02:41:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1677840072; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :from:to:cc:subject:date:message-id:reply-to; bh=31h/TwxZjU/eMNkRy/rigOc9LyijsM9RaRbj/TNatWw=; b=RneMdVVxbNNSPFOHB77lOxGVrt/PUKwP6dvfi+tbBSBSfTte9prWv75nUpwupLK7Rf 0Vao/jruRP+Xo9s0I2nuTlDGMWdOEx5fWxmgOnULxsJbAlhm4MeNgf+kfqV3FuI3n5zK zh7VJVwLXI5GynBeI8u37shHs25x/3OmO7XYGVbp31/CsMVJQmDt0nDSZ0k/GJJ8dF4+ Rxd9Shpb11nXqU3ybmK7ms3vkCx4xIM7zWuqAbIIQYAFlhpmpre0IVXokvhkWNnGG1CC wkc7ylHyf5bOyVDVGbCNSL5V1oCrK7nRkCL8VA0UIHxJ4GijtdqMfRkUjg3PRQnoImYW euLQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; t=1677840072; h=content-transfer-encoding:in-reply-to:from:references:cc:to :content-language:subject:user-agent:mime-version:date:message-id :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=31h/TwxZjU/eMNkRy/rigOc9LyijsM9RaRbj/TNatWw=; b=4bSpfS6floUn5B0nOEiKmUgP8ih1PT92h0VUxqq4GhQglDxJ+aIh8EeA3Pns582hAF 3QHnvCavV7i0TPMZMuk7ASbCRcF5oB/7LWVCPjOjhsWu7CUD1TktDITvP7sjlrvfPvo9 r8DdHrvi3YaWOthVcocPPQkdMmIexhAjRipQcoT+I2YraEFwbuJJ0yfKGIL5z1T/8dMf R6JWxYh/p7QMESHZamiLj75lMk3RQrwUFttgAaqiyDPnqtajB3C9SAmBh2N0yU7d8tDU qLBKL7W9zkO+GFSB+gQfK2DEyEIJG5vLONIo23LTyFawSv6iJtZorOfDtoEvsaiLtIuF +m2A== X-Gm-Message-State: AO0yUKUpUliCP8Rd/+QyIc6G1BKQuW4t+fgwaExVAzxeWncHkYbGZhWs GWNJJnhR16A+UN0icTEW+NW9JQ== X-Google-Smtp-Source: AK7set+zg5l3kKUqXGX5P2+Qlj6Wbf352Qt7wJxSDI79UVtGhmmuEmG+SQ9Y+M41PXMeJgs90bP6/g== X-Received: by 2002:a17:907:7e82:b0:8f4:6efd:833f with SMTP id qb2-20020a1709077e8200b008f46efd833fmr1422247ejc.3.1677840072585; Fri, 03 Mar 2023 02:41:12 -0800 (PST) Received: from [192.168.1.20] ([178.197.216.144]) by smtp.gmail.com with ESMTPSA id u25-20020a50a419000000b004bd6e3ed196sm980103edb.86.2023.03.03.02.41.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 03 Mar 2023 02:41:12 -0800 (PST) Message-ID: Date: Fri, 3 Mar 2023 11:41:10 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: [PATCH v6 1/2] dt-bindings: i2c: aspeed: support for AST2600-i2cv2 Content-Language: en-US To: Ryan Chen , Wolfram Sang Cc: Joel Stanley , Brendan Higgins , Krzysztof Kozlowski , Andrew Jeffery , "devicetree@vger.kernel.org" , Philipp Zabel , Rob Herring , Benjamin Herrenschmidt , "linux-aspeed@lists.ozlabs.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "openbmc@lists.ozlabs.org" , "linux-i2c@vger.kernel.org" References: <20230226031321.3126756-1-ryan_chen@aspeedtech.com> <20230226031321.3126756-2-ryan_chen@aspeedtech.com> <53090449-58c9-bc03-56df-aa8ae93c0c26@linaro.org> From: Krzysztof Kozlowski In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/03/2023 11:16, Ryan Chen wrote: >>>>>>> aspeed,timout properites: >>>>>>> For example I2C controller as slave mode, and suddenly >> disconnected. >>>>>>> Slave state machine will keep waiting for master clock in for >>>>>>> rx/tx >>>> transmit. >>>>>>> So it need timeout setting to enable timeout unlock controller state. >>>>>>> And in another side. In Master side also need avoid suddenly slave >>>>>> miss(un-plug), Master will timeout and release the SDA/SCL. >>>>>>> >>>>>>> Do you mean add those description into ore aspeed,timout >>>>>>> properites >>>>>> description? >>>>>> >>>>>> You are describing here one particular feature you want to enable >>>>>> in the driver which looks non-scalable and more difficult to >> configure/use. >>>>>> What I was looking for is to describe the actual configuration you have >> (e.g. >>>>>> multi-master) which leads to enable or disable such feature in your >>>> hardware. >>>>>> Especially that bool value does not scale later to actual timeout >>>>>> values in time (ms)... >>>>>> >>>>>> I don't know I2C that much, but I wonder - why this should be >>>>>> specific to Aspeed I2C and no other I2C controllers implement it? >>>>>> IOW, this looks quite generic and every I2C controller should have >>>>>> it. Adding it specific to Aspeed suggests that either we miss a >>>>>> generic property or this should not be in DT at all (because no one >>>>>> else has >>>> it...). >>>>>> >>>>>> Also I wonder, why you wouldn't enable timeout always... >>>>>> >>>>>> +Cc Wolfram, >>>>>> Maybe you know whether bool "timeout" property for one controller >>>>>> makes sense? Why we do not have it for all controllers? >>>>>> >>>>> Because, i2c bus didn’t specific timeout. >>>>> But SMBus defines a clock low time-out, TIMEOUT of 35 ms. >>>>> >>>>> It have definition in SMBus specification. >>>>> http://smbus.org/specs/SMBus_3_1_20180319.pdf >>>>> You can check Page 18, Note3 that have timeout description. >>>> >>>> Then you have already property for this - "smbus"? >>> To be a property "smbus", that would be a big topic, I saw fsl i2c >>> also have this. >>> https://github.com/torvalds/linux/blob/master/Documentation/devicetree >>> /bindings/i2c/i2c-mpc.yaml#L43-L47 >>> So, I just think the "timeout" property. >> >> Yeah and this is the only place. It also differs because it allows actual >> timeout values. > Thanks, So can I still keep the property "aspeed,timeout" here? > It is the only place. No, because none of my concerns above are addressed. Best regards, Krzysztof 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 0F812C64EC4 for ; Fri, 3 Mar 2023 10:42:16 +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:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Wse0A5mHQdvBGKXOrhqUGuQ48olzemFjcA+4fCXmyfw=; b=cC+OXdFoOmdzv+ r4tiIcVzXNqLKQ5UGf+lDh5xAuUwJM7LYZD1nWGWAjh/F99dpH0e3kHdF+UxKjjpZv2YbThTvRmwz lE8h9I+XbMbsD65xK28glzjGnKz/rWVoz+Ok2Ab4UqAgan1HQLQrQXYfySdi/u8Wwk940k030qIDv X3VjT3N2hv4QFmj0ZI8SwUxAGoI3j4tthkN9UUi5E2X3oV+zd7P+/qMzDvmk3u94cCZkJiLiMvGfB xeuYs6B0RZnMJHPl5fELeEy9+a+U3L1FVvuLi2xb72AxDW57pqwFKks4jHriR3fXfy0coaelREPNY hMWR9Y2KkZP3kQMiKorw==; 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Fri, 03 Mar 2023 02:41:12 -0800 (PST) Received: from [192.168.1.20] ([178.197.216.144]) by smtp.gmail.com with ESMTPSA id u25-20020a50a419000000b004bd6e3ed196sm980103edb.86.2023.03.03.02.41.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 03 Mar 2023 02:41:12 -0800 (PST) Message-ID: Date: Fri, 3 Mar 2023 11:41:10 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: [PATCH v6 1/2] dt-bindings: i2c: aspeed: support for AST2600-i2cv2 Content-Language: en-US To: Ryan Chen , Wolfram Sang Cc: Joel Stanley , Brendan Higgins , Krzysztof Kozlowski , Andrew Jeffery , "devicetree@vger.kernel.org" , Philipp Zabel , Rob Herring , Benjamin Herrenschmidt , "linux-aspeed@lists.ozlabs.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "openbmc@lists.ozlabs.org" , "linux-i2c@vger.kernel.org" References: <20230226031321.3126756-1-ryan_chen@aspeedtech.com> <20230226031321.3126756-2-ryan_chen@aspeedtech.com> <53090449-58c9-bc03-56df-aa8ae93c0c26@linaro.org> From: Krzysztof Kozlowski In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230303_024114_963436_8B9DCF6C X-CRM114-Status: GOOD ( 14.79 ) 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; 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