From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7F5101BDC0 for ; Mon, 20 Nov 2023 14:07:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="D92l2QfP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D6097C433C8; Mon, 20 Nov 2023 14:07:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700489245; bh=IPo5uNHuohZpfhm4bnYriPIt9hmMCAXJQeO/vH4xqFs=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=D92l2QfPaoq4M2hidlgzR7kN1fvGY59AMcDxixRB62xu8+N0BLIJsOAQO8EG6W0Er 1CBNZbpWygLY86+VReuCtk1DSk+KSqzFo63UNmg2gEpMD20i50MJfaymPALemUm9Cl zUGTl6JSpvuHivPOcwzdRcg+pNhzaJxEFxD4/Uxv9l5y8eknyAfPDK04/vA5Aygo0n bYRsGBolEucqf2JNS9yK1n6gjyUQxA/bhQPMMc83tlJGIxluicml42GB3pqI8Oci1Z 4t7LkI+H6xu0X1yP3Rb7eZSCmQcFfJ3mw55I3WsquOdLY7jaZR7zDf5z7WQLzVqUoJ 3fChlgSVwmQ0g== Message-ID: Date: Mon, 20 Nov 2023 15:07:16 +0100 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [net-next 2/2] net: dsa: realtek: load switch variants on demand Content-Language: en-US To: Vladimir Oltean Cc: Luiz Angelo Daros de Luca , netdev@vger.kernel.org, linus.walleij@linaro.org, alsi@bang-olufsen.dk, andrew@lunn.ch, f.fainelli@gmail.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, arinc.unal@arinc9.com References: <20231117235140.1178-1-luizluca@gmail.com> <20231117235140.1178-3-luizluca@gmail.com> <9460eced-5a3b-41c0-b821-e327f6bd06c9@kernel.org> <20231120134818.e2k673xsjec5scy5@skbuf> From: Krzysztof Kozlowski Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 20/11/2023 14:48, Vladimir Oltean wrote: > Hi Krzysztof, > > On Mon, Nov 20, 2023 at 10:20:13AM +0100, Krzysztof Kozlowski wrote: >> No, why do you need it? You should not need MODULE_ALIAS() in normal >> cases. If you need it, usually it means your device ID table is wrong >> (e.g. misses either entries or MODULE_DEVICE_TABLE()). MODULE_ALIAS() is >> not a substitute for incomplete ID table. >> >> Entire abstraction/macro is pointless and make the code less readable. > > Are you saying that the line > > MODULE_DEVICE_TABLE(of, realtek_common_of_match); > > should be put in all of realtek-mdio.c, realtek-smi.c, rtl8365mb.c and > rtl8366rb.c, but not in realtek-common.c? Driver should use MODULE_DEVICE_TABLE() for the table not MODULE_ALIAS() for each entry. I don't judge where should it be put. I just dislike usage of aliases as a incomplete-substitute of proper table. > > There are 5 kernel modules involved, 2 for interfaces and 2 for switches. > > Even if the same OF device ID table could be used to load multiple > modules, I'm not sure > (a) how to avoid loading the interface driver which will not be used > (SMI if it's a MDIO-connected switch, or MDIO if it's an SMI > connected switch) > (b) how to ensure that the drivers are loaded in the right order, i.e. > the switch drivers are loaded before the interface drivers I am sorry, I do not understand the problem. The MODULE_DEVICE_TABLE and MODULE_ALIAS create exactly the same behavior. How any of above would happen with table but not with alias having exactly the same compatibles? Best regards, Krzysztof