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 343BB134CF; Wed, 5 Mar 2025 20:37:17 +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=1741207039; cv=none; b=udTVjwBWpTwuSNzCabqlRC0/xESMgYDNoaFUcoH+rLbI4F2AlKNbweleeIP4JMfogyc9OVpPJm7RMjthnG1gaXCv+Nn2SKDicw/7vBuJFJhUF5KYOIRV+xJdkGOEudvkF+wF15jxCQcwJEB27T3DcVFZhwoubvZFdOevWN2GYuQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741207039; c=relaxed/simple; bh=kc8GnKy2/k0p40SmNBMlY8YXsE2cIHImyde1WkmdQgk=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=XlcSY/QXWLn1bHef3Urz1o5Ogwh/MyVc4I5zVr2VECFOJoGn+H9WW9DNgZJCdI3Y7MLIAdXqHvc7TjQe9PYNA1FFmmthyU6a/OGFLANqqLAM4tHhC1/N3T8xSP+t7aPkG/SGG28ZQeBKnlfaCP5jLi43HuNclgkwuFp+oj/KfTc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=S9e/BATt; 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="S9e/BATt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4AFFBC4CED1; Wed, 5 Mar 2025 20:37:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741207037; bh=kc8GnKy2/k0p40SmNBMlY8YXsE2cIHImyde1WkmdQgk=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=S9e/BATt0zrHcP3OeKno3G5WCfyLYnsSZ9kd4u0NuysbnHADrvKJHWTt1fYBwH89g opw0tBV7p3BurcsIYO2FkQTFc1FJ5T0r+b5OQx1fi2PRxH5zbr98B2pEXoWqdNw2tE KMxERN6wJMzhPT+mQoUKpY7tQl0zq6bkepCOdR9ZYL7DTrPIjbct7Yjl6IaM8hi9wo RaAuULk794YvF/aS3NSv0vvnlBLnaQzcq6ui6DL36oFxaIAeYoB62OWQN8gStp/nc1 /IElfEfhDDDl8tFlTIhUWZLV5jCU6bOUAJUiOzeoInmg9siTjibZQiqLO5NwyqBgJG MuD6lyhf4j/8g== Message-ID: Date: Wed, 5 Mar 2025 21:37:10 +0100 Precedence: bulk X-Mailing-List: linux-clk@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 2/2] clk: samsung: add initial exynos7870 clock driver From: Krzysztof Kozlowski To: Stephen Boyd , Alim Akhtar , Chanwoo Choi , Conor Dooley , Kaustabh Chakraborty , Michael Turquette , Rob Herring , Sylwester Nawrocki Cc: linux-samsung-soc@vger.kernel.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20250301-exynos7870-pmu-clocks-v5-0-715b646d5206@disroot.org> <20250301-exynos7870-pmu-clocks-v5-2-715b646d5206@disroot.org> <0a7c72cb-4b59-4146-8438-52d13b457a18@kernel.org> Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 05/03/2025 21:14, Krzysztof Kozlowski wrote: > On 04/03/2025 19:16, Stephen Boyd wrote: >> Quoting Kaustabh Chakraborty (2025-02-28 19:57:13) >>> diff --git a/drivers/clk/samsung/clk-exynos7870.c b/drivers/clk/samsung/clk-exynos7870.c >>> new file mode 100644 >>> index 0000000000000000000000000000000000000000..2ec4a4e489be30bd1cd2e6deac006bb8ac5bdc57 >>> --- /dev/null >>> +++ b/drivers/clk/samsung/clk-exynos7870.c >>> @@ -0,0 +1,1830 @@ >>> +// SPDX-License-Identifier: GPL-2.0-only >>> +/* >>> + * Copyright (C) 2015 Samsung Electronics Co., Ltd. >>> + * Author: Kaustabh Chakraborty >>> + * >>> + * Common Clock Framework support for Exynos7870. >>> + */ >>> + >>> +#include >> >> Please remove this include as this is a clk provider and not a clk >> consumer. > > > I fixed it up for all drivers. > >> >>> +#include >>> +#include >>> +#include >>> +#include >>> + >>> +#include >>> + >>> +#include "clk.h" >>> +#include "clk-exynos-arm64.h" >>> + >>> +/* >>> + * Register offsets for CMU_MIF (0x10460000) >>> + */ >> [...] >>> + >>> +static const struct samsung_cmu_info peri_cmu_info __initconst = { >>> + .gate_clks = peri_gate_clks, >>> + .nr_gate_clks = ARRAY_SIZE(peri_gate_clks), >>> + .clk_regs = peri_clk_regs, >>> + .nr_clk_regs = ARRAY_SIZE(peri_clk_regs), >>> + .nr_clk_ids = PERI_NR_CLK, >>> +}; >>> + >>> +static int __init exynos7870_cmu_probe(struct platform_device *pdev) >>> +{ >>> + const struct samsung_cmu_info *info; >>> + struct device *dev = &pdev->dev; >>> + >>> + info = of_device_get_match_data(dev); >> >> Use device APIs please: device_get_match_data() > > > I expect here a follow up patch. > >> >>> + exynos_arm64_register_cmu(dev, dev->of_node, info); >>> + >>> + return 0; >>> +} >>> + >>> +static const struct of_device_id exynos7870_cmu_of_match[] = { >>> + { >>> + .compatible = "samsung,exynos7870-cmu-mif", >>> + .data = &mif_cmu_info, >>> + }, { >>> + .compatible = "samsung,exynos7870-cmu-dispaud", >>> + .data = &dispaud_cmu_info, >>> + }, { >>> + .compatible = "samsung,exynos7870-cmu-fsys", >>> + .data = &fsys_cmu_info, >>> + }, { >>> + .compatible = "samsung,exynos7870-cmu-g3d", >>> + .data = &g3d_cmu_info, >>> + }, { >>> + .compatible = "samsung,exynos7870-cmu-isp", >>> + .data = &isp_cmu_info, >>> + }, { >>> + .compatible = "samsung,exynos7870-cmu-mfcmscl", >>> + .data = &mfcmscl_cmu_info, >>> + }, { >>> + .compatible = "samsung,exynos7870-cmu-peri", >>> + .data = &peri_cmu_info, >>> + }, { >>> + }, >>> +}; >>> + >>> +static struct platform_driver exynos7870_cmu_driver __refdata = { >> >> Having __refdata here looks wrong. >> >>> + .driver = { >>> + .name = "exynos7870-cmu", >>> + .of_match_table = exynos7870_cmu_of_match, >>> + .suppress_bind_attrs = true, >>> + }, >>> + .probe = exynos7870_cmu_probe, >>> +}; >>> + >>> +static int __init exynos7870_cmu_init(void) >>> +{ >>> + return platform_driver_register(&exynos7870_cmu_driver); >> >> Is this supposed to be platform_driver_probe()? All the __init markings >> in the samsung clk driver look like potential problems if anything >> defers or is made into a module. > > Indeed code is confusing but still correct. This is called from > core_initcall and nothing referencing __init/refdata can defer nor be a > module. There are modules but, AFAIR, they don't use __init/__refdata. > > The __refdata here was probably so this can reference __initconst in > other places. > > As you pointed out, probably the correct solution is to use > platform_driver_probe(). I'll fix this and existing drivers. Best regards, Krzysztof