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 CBCD1CF857C for ; Thu, 3 Oct 2024 10:47:55 +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=oDN3x80PkBgUItUWJO31sv2d7TcyNmkNy7eGQn23/Uo=; b=QCeLmXx3z80G3g9j6xpCUGZhMN FQ+W9amK9FoOlNWSNDgSwh2xEoOlUEx/TMZagbd41Acd1gP9vJp8lob20Wn2QHCM0XcaHfRRCyZIJ 91Qwnysd9mduJs+RsP05Ki63m/JP/DD8iobuG41/u40oVA0UtoHOAMrOKvyaQ8siR4r20rPfepUcc /RqajWKMQDbuZqI/JuMbnOlgVUuNIm1p+9fuvBCJn8Uxfk8ulMgQiyWy5gKBQLcTGJwq+YE5bJkwZ BeW/RyugOzKSNXtuKp/yAaPnpZGPnSA6RB5//G9067cbK5oNdZ3FvR8AcupAQlv8KHkQvZOA8QqrU ptRcPnWw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1swJN3-00000008pFN-0qp3; Thu, 03 Oct 2024 10:47:45 +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 1swJLi-00000008p21-0sA6 for linux-arm-kernel@lists.infradead.org; Thu, 03 Oct 2024 10:46:26 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 581605C00B0; Thu, 3 Oct 2024 10:46:17 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 132C5C4CEC5; Thu, 3 Oct 2024 10:46:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727952381; bh=m9/K6VvhKFRFfOMebN3I5d+4T6RrW1K2nP92qcHvI6A=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=qVTYgZhjNCrm6XEtRVAvqp8LGSFWQsn68WS1I68rxULa62NDQHN45W2HAGtGnZF+V n8TWskvwAXqxF8mLnG/z8+Pb0BUVlDrymNvVvYW20yE3+02GDGNxDHPA+XVxXrI12E pM/g9eyFGc/uOnMzA7WNcCqkgQAM8qfrLTSQUl7KcTtPnNrw8UNGwC73yjM0ZENW9W 9j2fIvsN2mNXlvmrdfPLlXaLhrKLyjgSde+L/euq+2mBrmFTtDvCC0Q0ufduWQm4Rz JuwecyTgFEB3yrmkmBEoBwVXfU5GTasKyPAlNU5iua3xQrFqTSwItUcYTO9qdgPqBb 2FXjOksl5l8kA== Message-ID: <82db5037-bbd3-4005-bde9-02df1bf4c475@kernel.org> Date: Thu, 3 Oct 2024 12:46:13 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/6] dt-bindings: clock: imx8m-anatop: support spread spectrum clocking To: Dario Binacchi Cc: linux-kernel@vger.kernel.org, linux-amarula@amarulasolutions.com, 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: <20240928083804.1073942-1-dario.binacchi@amarulasolutions.com> <20240928083804.1073942-2-dario.binacchi@amarulasolutions.com> <566859c1-a397-4465-987e-0682b07a703e@kernel.org> <6c3e6071-822f-4230-b76b-276330de07ef@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241003_034622_382889_C5568506 X-CRM114-Status: GOOD ( 25.74 ) 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 01/10/2024 08:29, Dario Binacchi wrote: > On Mon, Sep 30, 2024 at 8:45 AM Krzysztof Kozlowski wrote: >> >> On 29/09/2024 22:00, Dario Binacchi wrote: >>>> >>>> >>>>> + properties: >>>>> + compatible: >>>>> + contains: >>>>> + enum: >>>>> + - fsl,imx8mm-anatop >>>>> + >>>>> +then: >>>>> + properties: >>>>> + fsl,ssc-clocks: >>>> >>>> Nope. Properties must be defined in top-level. >>>> >>>>> + $ref: /schemas/types.yaml#/definitions/phandle-array >>>>> + description: >>>>> + The phandles to the PLLs with spread spectrum clock generation >>>>> + hardware capability. >>>> >>>> These should be clocks. >>> >>> Sorry, but I can't understand what you're asking me. >>> Could you kindly explain it to me in more detail? >> >> You added new property instead of using existing one for this purpose: >> 'clocks'. > >> >> >> >> Best regards, >> Krzysztof >> > > I added this new property specifically for managing spread-spectrum. > Indeed, not all clocks/PLLs > managed by the node/peripheral support spread-spectrum, and the added > properties specify > parameters for enabling and tuning SSC for each individual PLL based > on the index of each list. > If I were to use the 'clocks' property and add a clock to this list > that does not support SSC, IMHO > the pairings would be less clear. You duplicate property with argument "pairings shall match". Well, I am not happy with the duplication. Clocks have specific order, thus it is explicit which one needs tuning. Your other properties can match them as well, just index from clocks is offset... > > AFAIK the confusion arises from the fact that this node, which is a > clock controller, was used only > to export its base address, but perhaps it should have also exported > its clocks, which the other > clock controller does, as shown in: > Documentation/devicetree/bindings/clock/imx8m-clock.yaml. You use it as clocks, so I don't understand this comment. > If I consider its 'compatible' entries: > - 'fsl,imx8mm-ccm' -> drivers/clk/imx/clk-imx8mm.c > - 'fsl,imx8mn-ccm' -> drivers/clk/imx/clk-imx8mn.c > - 'fsl,imx8mp-ccm' -> drivers/clk/imx/clk-imx8mp.c > the probe function, triggered by fsl,imx8m{m,n,p}-ccm (and not > fsl,imx8m{m,n,p}-anatop), > retrieves the anatop node solely to get its base address, also > registering its clocks, which > I would have expected to be registered by another driver, specifically > the one for anatop: > > static int imx8mn_clocks_probe(struct platform_device *pdev) > { > struct device *dev = &pdev->dev; > struct device_node *np = dev->of_node; > void __iomem *base; > struct imx_pll14xx_ssc pll1443x_ssc; > int ret; > > clk_hw_data = devm_kzalloc(dev, struct_size(clk_hw_data, hws, > IMX8MN_CLK_END), GFP_KERNEL); > if (WARN_ON(!clk_hw_data)) > return -ENOMEM; > > clk_hw_data->num = IMX8MN_CLK_END; > hws = clk_hw_data->hws; > > hws[IMX8MN_CLK_DUMMY] = imx_clk_hw_fixed("dummy", 0); > hws[IMX8MN_CLK_24M] = imx_get_clk_hw_by_name(np, "osc_24m"); > hws[IMX8MN_CLK_32K] = imx_get_clk_hw_by_name(np, "osc_32k"); > hws[IMX8MN_CLK_EXT1] = imx_get_clk_hw_by_name(np, "clk_ext1"); > hws[IMX8MN_CLK_EXT2] = imx_get_clk_hw_by_name(np, "clk_ext2"); > hws[IMX8MN_CLK_EXT3] = imx_get_clk_hw_by_name(np, "clk_ext3"); > hws[IMX8MN_CLK_EXT4] = imx_get_clk_hw_by_name(np, "clk_ext4"); > > np = of_find_compatible_node(NULL, NULL, "fsl,imx8mn-anatop"); > base = devm_of_iomap(dev, np, 0, NULL); > of_node_put(np); > if (WARN_ON(IS_ERR(base))) { > ret = PTR_ERR(base); > goto unregister_hws; > } > > hws[IMX8MN_AUDIO_PLL1_REF_SEL] = imx_clk_hw_mux("audio_pll1_ref_sel", > base + 0x0, 0, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels)); > hws[IMX8MN_AUDIO_PLL2_REF_SEL] = imx_clk_hw_mux("audio_pll2_ref_sel", > base + 0x14, 0, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels)); > hws[IMX8MN_VIDEO_PLL_REF_SEL] = imx_clk_hw_mux("video_pll_ref_sel", > base + 0x28, 0, 2, pll_ref_sels, ARRAY_SIZE(pll_ref_sels)); Sorry, I am not going to dwell into drivers code. We talk here about bindings and new properties. Best regards, Krzysztof