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 25E2418FDD7; Tue, 3 Sep 2024 18:27:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725388046; cv=none; b=ou/RFko5nRNMFP2DvXOcTkXlgT78LRbdGobEYFNevHkWhV1IJKBcC1Fi+ZJD40zNABztD+fMZZbHxMqW7nOVTr8d6npOAv9aSBrfqHEhGoZ9TSlW/gnsrB0oupFf45EcGAyMcwUa9k74TSsRQakIxJwZiS8+hv9bvn8iQggqtsE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725388046; c=relaxed/simple; bh=jtq+NV2hFNSsN40Ko7LAblrCis08mq85mqLfSbvwx4A=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=GVLkNy11Fcl92VrdgtiaJN7ybo/DNBZ3U3zPIg7ms9i+bEx0bOpLfvoTnD9DcsDsRgJsBfa+UncQO3u7gLswbZbmrk20SgJCqbciy6t8wDSoqkVa3GRfr1lHPQDDU/ULa0dPmmdMBLh9AZAP9cNasa62L543GgoIq2jFAchO6xo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=cZUJ+bTe; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="cZUJ+bTe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1F48FC4CEC5; Tue, 3 Sep 2024 18:27:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725388045; bh=jtq+NV2hFNSsN40Ko7LAblrCis08mq85mqLfSbvwx4A=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=cZUJ+bTeqLi5y51bzBiYvYdQHngkR/4dba4aCV397G5bKm7jE99jg4yrTptWd3CTm /eEbjScXUiD/gVAKNKlGmafp3i5yrPI2V4t91OpF105/nMYV2sSVHssF8+W+QGmMLK JdqP/bwxwprfZCNmaFuoPq/FSWeGZ3iuFRCQbrV4iwdvxJYp3IGphdluTKzdOprdQH FZ3X4Cm1vfYA5tjyYrJbVaVIvudaOqno31GQQc5OpYL8+x3yoLziuN0Z9/7guSd5dE MIrzLZyOjhvGNjE1OkfiWm+GrcAuRgpr6pjLNN1jjchtLM+S3aPzAp3d5fU+tWc5fK UPPgxFN4IYuoA== Message-ID: <39735704-ae94-4ff8-bf4d-d2638b046c8e@kernel.org> Date: Tue, 3 Sep 2024 20:27:14 +0200 Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 08/11] misc: rp1: RaspberryPi RP1 misc driver To: Andrea della Porta Cc: Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Florian Fainelli , Broadcom internal kernel review list , Linus Walleij , Catalin Marinas , Will Deacon , Derek Kiernan , Dragan Cvetic , Arnd Bergmann , Greg Kroah-Hartman , Nicolas Ferre , Claudiu Beznea , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Saravana Kannan , Bjorn Helgaas , linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, linux-arch@vger.kernel.org, Lee Jones , Andrew Lunn , Stefan Wahren References: <5954e4dccc0e158cf434d2c281ad57120538409b.1724159867.git.andrea.porta@suse.com> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; keydata= xsFNBFVDQq4BEAC6KeLOfFsAvFMBsrCrJ2bCalhPv5+KQF2PS2+iwZI8BpRZoV+Bd5kWvN79 cFgcqTTuNHjAvxtUG8pQgGTHAObYs6xeYJtjUH0ZX6ndJ33FJYf5V3yXqqjcZ30FgHzJCFUu JMp7PSyMPzpUXfU12yfcRYVEMQrmplNZssmYhiTeVicuOOypWugZKVLGNm0IweVCaZ/DJDIH gNbpvVwjcKYrx85m9cBVEBUGaQP6AT7qlVCkrf50v8bofSIyVa2xmubbAwwFA1oxoOusjPIE J3iadrwpFvsZjF5uHAKS+7wHLoW9hVzOnLbX6ajk5Hf8Pb1m+VH/E8bPBNNYKkfTtypTDUCj NYcd27tjnXfG+SDs/EXNUAIRefCyvaRG7oRYF3Ec+2RgQDRnmmjCjoQNbFrJvJkFHlPeHaeS BosGY+XWKydnmsfY7SSnjAzLUGAFhLd/XDVpb1Een2XucPpKvt9ORF+48gy12FA5GduRLhQU vK4tU7ojoem/G23PcowM1CwPurC8sAVsQb9KmwTGh7rVz3ks3w/zfGBy3+WmLg++C2Wct6nM Pd8/6CBVjEWqD06/RjI2AnjIq5fSEH/BIfXXfC68nMp9BZoy3So4ZsbOlBmtAPvMYX6U8VwD TNeBxJu5Ex0Izf1NV9CzC3nNaFUYOY8KfN01X5SExAoVTr09ewARAQABzSVLcnp5c3p0b2Yg S296bG93c2tpIDxrcnprQGtlcm5lbC5vcmc+wsGVBBMBCgA/AhsDBgsJCAcDAgYVCAIJCgsE FgIDAQIeAQIXgBYhBJvQfg4MUfjVlne3VBuTQ307QWKbBQJgPO8PBQkUX63hAAoJEBuTQ307 QWKbBn8P+QFxwl7pDsAKR1InemMAmuykCHl+XgC0LDqrsWhAH5TYeTVXGSyDsuZjHvj+FRP+ gZaEIYSw2Yf0e91U9HXo3RYhEwSmxUQ4Fjhc9qAwGKVPQf6YuQ5yy6pzI8brcKmHHOGrB3tP /MODPt81M1zpograAC2WTDzkICfHKj8LpXp45PylD99J9q0Y+gb04CG5/wXs+1hJy/dz0tYy iua4nCuSRbxnSHKBS5vvjosWWjWQXsRKd+zzXp6kfRHHpzJkhRwF6ArXi4XnQ+REnoTfM5Fk VmVmSQ3yFKKePEzoIriT1b2sXO0g5QXOAvFqB65LZjXG9jGJoVG6ZJrUV1MVK8vamKoVbUEe 0NlLl/tX96HLowHHoKhxEsbFzGzKiFLh7hyboTpy2whdonkDxpnv/H8wE9M3VW/fPgnL2nPe xaBLqyHxy9hA9JrZvxg3IQ61x7rtBWBUQPmEaK0azW+l3ysiNpBhISkZrsW3ZUdknWu87nh6 eTB7mR7xBcVxnomxWwJI4B0wuMwCPdgbV6YDUKCuSgRMUEiVry10xd9KLypR9Vfyn1AhROrq AubRPVeJBf9zR5UW1trJNfwVt3XmbHX50HCcHdEdCKiT9O+FiEcahIaWh9lihvO0ci0TtVGZ MCEtaCE80Q3Ma9RdHYB3uVF930jwquplFLNF+IBCn5JRzsFNBFVDXDQBEADNkrQYSREUL4D3 Gws46JEoZ9HEQOKtkrwjrzlw/tCmqVzERRPvz2Xg8n7+HRCrgqnodIYoUh5WsU84N03KlLue MNsWLJBvBaubYN4JuJIdRr4dS4oyF1/fQAQPHh8Thpiz0SAZFx6iWKB7Qrz3OrGCjTPcW6ei OMheesVS5hxietSmlin+SilmIAPZHx7n242u6kdHOh+/SyLImKn/dh9RzatVpUKbv34eP1wA GldWsRxbf3WP9pFNObSzI/Bo3kA89Xx2rO2roC+Gq4LeHvo7ptzcLcrqaHUAcZ3CgFG88CnA 6z6lBZn0WyewEcPOPdcUB2Q7D/NiUY+HDiV99rAYPJztjeTrBSTnHeSBPb+qn5ZZGQwIdUW9 YegxWKvXXHTwB5eMzo/RB6vffwqcnHDoe0q7VgzRRZJwpi6aMIXLfeWZ5Wrwaw2zldFuO4Dt 91pFzBSOIpeMtfgb/Pfe/a1WJ/GgaIRIBE+NUqckM+3zJHGmVPqJP/h2Iwv6nw8U+7Yyl6gU BLHFTg2hYnLFJI4Xjg+AX1hHFVKmvl3VBHIsBv0oDcsQWXqY+NaFahT0lRPjYtrTa1v3tem/ JoFzZ4B0p27K+qQCF2R96hVvuEyjzBmdq2esyE6zIqftdo4MOJho8uctOiWbwNNq2U9pPWmu 4vXVFBYIGmpyNPYzRm0QPwARAQABwsF8BBgBCgAmAhsMFiEEm9B+DgxR+NWWd7dUG5NDfTtB YpsFAmA872oFCRRflLYACgkQG5NDfTtBYpvScw/9GrqBrVLuJoJ52qBBKUBDo4E+5fU1bjt0 Gv0nh/hNJuecuRY6aemU6HOPNc2t8QHMSvwbSF+Vp9ZkOvrM36yUOufctoqON+wXrliEY0J4 ksR89ZILRRAold9Mh0YDqEJc1HmuxYLJ7lnbLYH1oui8bLbMBM8S2Uo9RKqV2GROLi44enVt vdrDvo+CxKj2K+d4cleCNiz5qbTxPUW/cgkwG0lJc4I4sso7l4XMDKn95c7JtNsuzqKvhEVS oic5by3fbUnuI0cemeizF4QdtX2uQxrP7RwHFBd+YUia7zCcz0//rv6FZmAxWZGy5arNl6Vm lQqNo7/Poh8WWfRS+xegBxc6hBXahpyUKphAKYkah+m+I0QToCfnGKnPqyYIMDEHCS/RfqA5 t8F+O56+oyLBAeWX7XcmyM6TGeVfb+OZVMJnZzK0s2VYAuI0Rl87FBFYgULdgqKV7R7WHzwD uZwJCLykjad45hsWcOGk3OcaAGQS6NDlfhM6O9aYNwGL6tGt/6BkRikNOs7VDEa4/HlbaSJo 7FgndGw1kWmkeL6oQh7wBvYll2buKod4qYntmNKEicoHGU+x91Gcan8mCoqhJkbqrL7+nXG2 5Q/GS5M9RFWS+nYyJh+c3OcfKqVcZQNANItt7+ULzdNJuhvTRRdC3g9hmCEuNSr+CLMdnRBY fv0= In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 03/09/2024 17:15, Andrea della Porta wrote: >>>>> + >>>>> + rp1_clocks: clocks@c040018000 { >>>> >>>> Why do you mix MMIO with non-MMIO nodes? This really does not look >>>> correct. >>>> >>> >>> Right. This is already under discussion here: >>> https://lore.kernel.org/all/ZtBzis5CzQMm8loh@apocalypse/ >>> >>> IIUC you proposed to instantiate the non-MMIO nodes (the three clocks) by >>> using CLK_OF_DECLARE. >> >> Depends. Where are these clocks? Naming suggests they might not be even >> part of this device. But if these are part of the device, then why this >> is not a clock controller (if they are controllable) or even removed >> (because we do not represent internal clock tree in DTS). > > xosc is a crystal connected to the oscillator input of the RP1, so I would > consider it an external fixed-clock. If we were in the entire dts, I would have > put it in root under /clocks node, but here we're in the dtbo so I'm not sure > where else should I put it. But physically, on which PCB, where is this clock located? > > Regarding pclk and hclk, I'm still trying to understand where they come from. > If they are external clocks (since they are fixed-clock too), they should be > in the same node as xosc. CLK_OF_DECLARE does not seem to fit here because There is no such node as "/clocks" so do not focus on that. That's just placeholder but useless and it is inconsistent with other cases (e.g. regulators). If this is external oscillator then it is not part of RP1 and you cannot put it inside just to satisfy your drivers. > there's no special management of these clocks, so no new clock definition is > needed. > If they are internal tree, I cannot simply get rid of them because rp1_eth node > references these two clocks (see clocks property), so they must be decalred > somewhere. Any hint about this?. > Describe the hardware. Show the diagram or schematics where is which device. Best regards, Krzysztof