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 96B6DD44D75 for ; Wed, 6 Nov 2024 14:24:59 +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:References:Cc:To:From: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=eVOIv2tLzBMKag3Dfj/eIka07tj2vMmx3GPHRsK2KXs=; b=aHEG9FMgy8E8vYyRZNMY/j+Hqc KIXPenAK8AxelezrO5MPLfBLmwzpsZfvxc3A8xuTlKUyVnRr2avixi0CdKgz3xw7H0vXO8E9gOM9y umPnL4WumV110Z2ZZ3DK7qunv0NsKyotZMFr5ISxgfeE/JrVkSBLDw08COGQzEjGoomSCvycePJ3Y qEqg0H8aRRMwM9XjVVidmQTSJp+ig+HL54hKkEPJz5I02jqg3viWd6aeTd1AKEuDHzs/i0FrPz5PL vKfmyW9X41ps795SP1gZQwyIdFrQc38ziCqikyBxJ3YPYr9kT+rU41J+C1MiL6ahXeM4GpZ7eldSC n1moN1WQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t8gxk-00000003agC-0tVn; Wed, 06 Nov 2024 14:24:48 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t8gn2-00000003YWv-31SF for linux-arm-kernel@lists.infradead.org; Wed, 06 Nov 2024 14:13:46 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 6DBE85C078E; Wed, 6 Nov 2024 14:12:59 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 535A7C4CEC6; Wed, 6 Nov 2024 14:13:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730902423; bh=+pLThVS1L/IAbP/3NgRHcs2F5PUAiuFpNCtGhSyvvF8=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=vRA45zPBaLdOc77fWsdIuvUEiqfe3+G8GIwHpl0Uek4hP1DTnRDRwMeU8IoVhjPnU DZB41e+XVNvEvRgEVJ4xgEEyIPLoZ6ZKKyH57Q5mJe8Yu/q3KzInppbwZUSzCXlSM7 XRC2JCYAaz9Oe/tb1jXj2UAR/C7uRvjneHgJE/SCtm7ks5LNmaUlNhFg2yFV87IfzF 2VF/Vu5y/Y7MDnkR8nudRqPsd0OpR1/6p9OXUA9WaIuiPO1CT031tpnppWGblCZv5e Hii6KRqNFVaNkwbSYGw/PT1F77BxhgDPpF156ch7BDDjGY68Q/C3PSg9ZpVNAehE/Y Hi2h07/JnFoxQ== Message-ID: Date: Wed, 6 Nov 2024 15:13:37 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 1/8] dt-bindings: clock: imx8m-clock: support spread spectrum clocking From: Krzysztof Kozlowski To: Dario Binacchi Cc: linux-kernel@vger.kernel.org, linux-amarula@amarulasolutions.com, Abel Vesa , Conor Dooley , Fabio Estevam , Krzysztof Kozlowski , Michael Turquette , Peng Fan , Pengutronix Kernel Team , Rob Herring , Sascha Hauer , Shawn Guo , Stephen Boyd , devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org References: <20241106090549.3684963-1-dario.binacchi@amarulasolutions.com> <20241106090549.3684963-2-dario.binacchi@amarulasolutions.com> <4bix7me5vaoyhcuffyp4btajmhy7no6ltczoesopaz2fqupyaw@fensx4nn472u> 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-20241106_061345_029647_7017FFB9 X-CRM114-Status: GOOD ( 25.58 ) 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 06/11/2024 15:10, Krzysztof Kozlowski wrote: > On Wed, Nov 06, 2024 at 09:57:57AM +0100, Dario Binacchi wrote: >> The patch adds the DT bindings for enabling and tuning spread spectrum >> clocking generation. > > We had long talks about this but nothing of it got reflected in commit > msg. Sorry, I don't remember what I was talking in some particular patch > month ago, so you will get the same questions over and over... > >> >> Signed-off-by: Dario Binacchi >> >> --- >> >> Changes in v3: >> - Added in v3 >> - The dt-bindings have been moved from fsl,imx8m-anatop.yaml to >> imx8m-clock.yaml. The anatop device (fsl,imx8m-anatop.yaml) is >> indeed more or less a syscon, so it represents a memory area >> accessible by ccm (imx8m-clock.yaml) to setup the PLLs. >> >> .../bindings/clock/imx8m-clock.yaml | 46 +++++++++++++++++++ >> 1 file changed, 46 insertions(+) >> >> diff --git a/Documentation/devicetree/bindings/clock/imx8m-clock.yaml b/Documentation/devicetree/bindings/clock/imx8m-clock.yaml >> index c643d4a81478..7920393e518e 100644 >> --- a/Documentation/devicetree/bindings/clock/imx8m-clock.yaml >> +++ b/Documentation/devicetree/bindings/clock/imx8m-clock.yaml >> @@ -43,6 +43,40 @@ properties: >> ID in its "clocks" phandle cell. See include/dt-bindings/clock/imx8m-clock.h >> for the full list of i.MX8M clock IDs. >> >> + fsl,ssc-clocks: >> + $ref: /schemas/types.yaml#/definitions/phandle-array >> + description: >> + Phandles of the PLL with spread spectrum generation hardware capability. >> + minItems: 1 >> + maxItems: 4 > > 1. How is it possible that you change spread spectrum of some clocks from > main Clock Controller, while this device is not a consumer of them? > Basically this means that this device does not have these clocks but yet > you claim that it needs to configure spread for them! It's contradictory > to me and nohing got explained in commit msg about it. I am pretty sure > I asked about this alrady. I digged my previous answer and it was pretty clear here: 18:44 You can, but I still have the same concerns. How this device - which does not take any clock input, has no clocks at all - can depend on spread spectrum of some PLLs? Thsi device does not have clocks. 18:50 device has no clocks, I checked now third time 18:50 If device has clocks, it must have clocks property So again, you do not need this property at all. I repeated it multiple times - you are supposed to use clocks property. > > 2. Why is this array flexible in size? > > Best regards, > Krzysztof > Best regards, Krzysztof