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 70F90C369B2 for ; Thu, 17 Apr 2025 05:41:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type: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=6OePJdGUBwx3R0Qs2ZlkEKVzy4+db8vUD6dvMOblevw=; b=ezl7lojsMjwTZC/QNlnxsH+CnK uyFmomseQAxCSBjSs4up9Z8d6naZsL3esm1xeQOB2klQCfnv2URgas1JOn97rix66+zZqU9WAzgUq pUcJz5o9SkrpxFt8Kgws6nbT3NJUYOC/6462Cf6G5P7gZugpofLdonGLx32I7NW0lS5njD6IaKYZb o3nKvoBBxYAQCw8qQEMVaG4QLqYmrG/lcY+zGudHASBVPvCWozHGvNaAEksdf/PtbBaKEO/wALSw+ fbcUx1ewEKKBbIq95cwgFluwdYEg2eWTu2jQmfAs64XCC3E4BA4jT90OswHc+qeyrKUPQJ8SsfBtY E2Cc7S3Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1u5I0R-0000000Bnj2-2A7j; Thu, 17 Apr 2025 05:41:47 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1u5HyZ-0000000BnK7-45pO for linux-arm-kernel@lists.infradead.org; Thu, 17 Apr 2025 05:39:53 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 4581A4A421; Thu, 17 Apr 2025 05:39:50 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 13208C4CEE4; Thu, 17 Apr 2025 05:39:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1744868391; bh=O+7UduCp8OWrVDAANuMZTwB/Aldeg/z+ZeOeNAciQ+0=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=RCl6riEpixKGXyqSZL1ftlEjmnCLrlYV1FBSZKJAVmkJmdx+PRaHyn0eDO/ZjikuQ RJpJDoAraOoLBmfQ7JQsrP5U9aUss6PfMktt5X3dSdYJ1Cp5qheMGcd/NsVk9wjTpL +asjBcncP4M5zhefatZO+mM0XFcMNxx1ubpH3tpDRlTA+jHbSJuIdq0zDv0RFwPJ8P s0mFV5+UNDivWe883qlQE+aoLmVGPEE+LJ2UlCyiD1LKZvWqNhrMz5Ab68jGh6o5uU vrAQDPgU3LZsTuIgWKSecxNLmwqZFXq1yC1iFGtkVCLLkSxGPVBY658jQznxwf4QWt Ll8w+58O91JfQ== Message-ID: Date: Thu, 17 Apr 2025 07:39:47 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 2/3] arm64: dts: ti: k3-am62l: add initial infrastructure To: Bryan Brattlof Cc: Nishanth Menon , Vignesh Raghavendra , Tero Kristo , Rob Herring , Krzysztof Kozlowski , Conor Dooley , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250407-am62lx-v4-0-ce97749b9eae@ti.com> <20250407-am62lx-v4-2-ce97749b9eae@ti.com> <20250409-calculating-hungry-mosquito-f8cfeb@shite> <20250411182608.cpxr357humjq6ln7@bryanbrattlof.com> <859a4fc2-45f5-4d72-9727-7979e4c15bd5@kernel.org> <20250416144202.4bmm566iqaz6adzo@bryanbrattlof.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250416_223952_056038_82349341 X-CRM114-Status: GOOD ( 14.85 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 16/04/2025 16:42, Bryan Brattlof wrote: > On April 12, 2025 thus sayeth Krzysztof Kozlowski: >> On 11/04/2025 20:26, Bryan Brattlof wrote: >>>>> + >>>>> + usb0_phy_ctrl: syscon@45000 { >>>>> + compatible = "ti,am62-usb-phy-ctrl", "syscon"; >>>>> + reg = <0x45000 0x4>; >>>>> + bootph-all; >>>>> + }; >>>>> + >>>>> + usb1_phy_ctrl: syscon@45004 { >>>>> + compatible = "ti,am62-usb-phy-ctrl", "syscon"; >>>>> + reg = <0x45004 0x4>; >>>> >>>> No, you do not get syscon per register. The entire point of syscon is to >>>> collect ALL registers. Your device is the syscon, not a register. >>>> >>> >>> My understanding from [0] was that we would need to break this up into >>> smaller syscon nodes because the alternative would be to mark the entire >>> region as a syscon and every other node using it would need to use it's >>> base + offset which was kinda undesirable especially for the small >>> number of drivers that need data from this region. >>> >>> a-device { >>> clocks = <&epwm_tbclk 0>; >> >> >> Hm? That's how you use the syscon, so how it can be undesirable? >> >> Anyway, one register is not a device, so no device node per register. >> >> In the link you provided I was repeating the same, so you got same >> review in multiple places. >> > > Interesting. The way I read that thread was the opposite and it's why we > did this for the 62, 62A, and 62P devices. I mainly say it's unfortunate Really? What was unclear here: https://lore.kernel.org/lkml/20250124-able-beagle-of-prowess-f5eb7a@krzk-bin/ Un-acked, I missed the point that you really speak in commit msg about register and you really treat one register is a device. I assumed you only need that register from this device, but no. That obviously is not what this device is. Device is not a single register among 10000 others. IOW, You do not have 10000 devices there. NAK > because if we have a block of miscellaneous registers there's no clear > guidance on how big or small that range can or should be and we still > need to encode the offset to that exact register. > > By labeling each register we at least have the opportunity to describe > each register and if they are even used. Repeated many times: no device nodes per clock (also TI invention), no device nodes per register. This is not an opportunity. This is just not desired. Best regards, Krzysztof