linux-kernel - Re: [PATCH v2 01/19] clk: meson: introduce meson-clkc-utils

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Message-ID: <1ja5w1xrly.fsf@starbuckisacylon.baylibre.com>
Date:   Wed, 12 Jul 2023 14:03:19 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 01/19] clk: meson: introduce meson-clkc-utils


On Mon 12 Jun 2023 at 11:57, Neil Armstrong <neil.armstrong@...aro.org> wrote:

> Let's introduce a new module called meson-clkc-utils that
> will contain shared utility functions for all Amlogic clock
> controller drivers.
>
> The first utility function is a replacement of of_clk_hw_onecell_get
> in order to get rid of the NR_CLKS define in all Amlogic clock
> drivers.
>
> The goal is to move all duplicate probe and init code in this module.
>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>

Hi Neil,

checkpatch complains about the MODULE_LICENSE()

WARNING: Prefer "GPL" over "GPL v2" - see commit bf7fbeeae6db ("module: Cure the MODULE_LICENSE "GPL" vs. "GPL v2" bogosity")
#185: FILE: drivers/clk/meson/meson-clkc-utils.c:25:
+MODULE_LICENSE("GPL v2");

I don't mind fixing this up while applying if it is Ok with you.

> ---
>  drivers/clk/meson/Kconfig            |  3 +++
>  drivers/clk/meson/Makefile           |  1 +
>  drivers/clk/meson/meson-clkc-utils.c | 25 +++++++++++++++++++++++++
>  drivers/clk/meson/meson-clkc-utils.h | 19 +++++++++++++++++++
>  4 files changed, 48 insertions(+)
>
> diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig
> index 8ce846fdbe43..d03adad31318 100644
> --- a/drivers/clk/meson/Kconfig
> +++ b/drivers/clk/meson/Kconfig
> @@ -30,6 +30,9 @@ config COMMON_CLK_MESON_VID_PLL_DIV
>  	tristate
>  	select COMMON_CLK_MESON_REGMAP
>  
> +config COMMON_CLK_MESON_CLKC_UTILS
> +	tristate
> +
>  config COMMON_CLK_MESON_AO_CLKC
>  	tristate
>  	select COMMON_CLK_MESON_REGMAP
> diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile
> index d5288662881d..cd961cc4f4db 100644
> --- a/drivers/clk/meson/Makefile
> +++ b/drivers/clk/meson/Makefile
> @@ -1,6 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  # Amlogic clock drivers
>  
> +obj-$(CONFIG_COMMON_CLK_MESON_CLKC_UTILS) += meson-clkc-utils.o
>  obj-$(CONFIG_COMMON_CLK_MESON_AO_CLKC) += meson-aoclk.o
>  obj-$(CONFIG_COMMON_CLK_MESON_CPU_DYNDIV) += clk-cpu-dyndiv.o
>  obj-$(CONFIG_COMMON_CLK_MESON_DUALDIV) += clk-dualdiv.o
> diff --git a/drivers/clk/meson/meson-clkc-utils.c b/drivers/clk/meson/meson-clkc-utils.c
> new file mode 100644
> index 000000000000..9a0620bcc161
> --- /dev/null
> +++ b/drivers/clk/meson/meson-clkc-utils.c
> @@ -0,0 +1,25 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (c) 2023 Neil Armstrong <neil.armstrong@...aro.org>
> + */
> +
> +#include <linux/of_device.h>
> +#include <linux/clk-provider.h>
> +#include <linux/module.h>
> +#include "meson-clkc-utils.h"
> +
> +struct clk_hw *meson_clk_hw_get(struct of_phandle_args *clkspec, void *clk_hw_data)
> +{
> +	const struct meson_clk_hw_data *data = clk_hw_data;
> +	unsigned int idx = clkspec->args[0];
> +
> +	if (idx >= data->num) {
> +		pr_err("%s: invalid index %u\n", __func__, idx);
> +		return ERR_PTR(-EINVAL);
> +	}
> +
> +	return data->hws[idx];
> +}
> +EXPORT_SYMBOL_GPL(meson_clk_hw_get);
> +
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/clk/meson/meson-clkc-utils.h b/drivers/clk/meson/meson-clkc-utils.h
> new file mode 100644
> index 000000000000..fe6f40728949
> --- /dev/null
> +++ b/drivers/clk/meson/meson-clkc-utils.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
> +/*
> + * Copyright (c) 2023 Neil Armstrong <neil.armstrong@...aro.org>
> + */
> +
> +#ifndef __MESON_CLKC_UTILS_H__
> +#define __MESON_CLKC_UTILS_H__
> +
> +#include <linux/of_device.h>
> +#include <linux/clk-provider.h>
> +
> +struct meson_clk_hw_data {
> +	struct clk_hw	**hws;
> +	unsigned int	num;
> +};
> +
> +struct clk_hw *meson_clk_hw_get(struct of_phandle_args *clkspec, void *clk_hw_data);
> +
> +#endif