linux-kernel - Re: [PATCH v5 2/2] clk: samsung: add initial exynos7870 clock driver

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Message-ID: <b4fb36bc3970293ebdf1ac793bb3d752.sboyd@kernel.org>
Date: Tue, 04 Mar 2025 10:16:03 -0800
From: Stephen Boyd <sboyd@...nel.org>
To: Alim Akhtar <alim.akhtar@...sung.com>, Chanwoo Choi <cw00.choi@...sung.com>, Conor Dooley <conor+dt@...nel.org>, Kaustabh Chakraborty <kauschluss@...root.org>, Krzysztof Kozlowski <krzk@...nel.org>, Michael Turquette <mturquette@...libre.com>, Rob Herring <robh@...nel.org>, Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc: linux-samsung-soc@...r.kernel.org, linux-clk@...r.kernel.org, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Kaustabh Chakraborty <kauschluss@...root.org>
Subject: Re: [PATCH v5 2/2] clk: samsung: add initial exynos7870 clock driver

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 <kauschluss@...root.org>
> + *
> + * Common Clock Framework support for Exynos7870.
> + */
> +
> +#include <linux/clk.h>

Please remove this include as this is a clk provider and not a clk
consumer.

> +#include <linux/clk-provider.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +
> +#include <dt-bindings/clock/samsung,exynos7870-cmu.h>
> +
> +#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()

> +       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.