linux-kernel - Re: [PATCH v2 2/7] ASoC: mediatek: mt7986: support audio clock control

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Date:   Tue, 4 Jul 2023 10:53:20 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Maso Huang <maso.huang@...iatek.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Trevor Wu <trevor.wu@...iatek.com>,
        Jiaxin Yu <jiaxin.yu@...iatek.com>,
        Ren Zhijie <renzhijie2@...wei.com>,
        Allen-KH Cheng <allen-kh.cheng@...iatek.com>,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 2/7] ASoC: mediatek: mt7986: support audio clock
 control

Il 26/06/23 04:34, Maso Huang ha scritto:
> Add audio clock wrapper and audio tuner control.
> 
> Signed-off-by: Maso Huang <maso.huang@...iatek.com>
> ---
>   sound/soc/mediatek/mt7986/mt7986-afe-clk.c | 75 ++++++++++++++++++++++
>   sound/soc/mediatek/mt7986/mt7986-afe-clk.h | 18 ++++++
>   2 files changed, 93 insertions(+)
>   create mode 100644 sound/soc/mediatek/mt7986/mt7986-afe-clk.c
>   create mode 100644 sound/soc/mediatek/mt7986/mt7986-afe-clk.h
> 
> diff --git a/sound/soc/mediatek/mt7986/mt7986-afe-clk.c b/sound/soc/mediatek/mt7986/mt7986-afe-clk.c
> new file mode 100644
> index 000000000000..a8b5fae05673
> --- /dev/null
> +++ b/sound/soc/mediatek/mt7986/mt7986-afe-clk.c
> @@ -0,0 +1,75 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * mt7986-afe-clk.c  --  MediaTek 7986 afe clock ctrl
> + *
> + * Copyright (c) 2021 MediaTek Inc.
> + * Author: Vic Wu <vic.wu@...iatek.com>
> + *         Maso Huang <maso.huang@...iatek.com>
> + */
> +
> +#include <linux/clk.h>
> +
> +#include "mt7986-afe-common.h"
> +#include "mt7986-afe-clk.h"
> +#include "mt7986-reg.h"
> +
> +enum {
> +	CK_INFRA_AUD_BUS_CK = 0,
> +	CK_INFRA_AUD_26M_CK,
> +	CK_INFRA_AUD_L_CK,
> +	CK_INFRA_AUD_AUD_CK,
> +	CK_INFRA_AUD_EG2_CK,
> +	CLK_NUM
> +};
> +
> +static const char *aud_clks[CLK_NUM] = {
> +	[CK_INFRA_AUD_BUS_CK] = "aud_bus_ck",
> +	[CK_INFRA_AUD_26M_CK] = "aud_26m_ck",
> +	[CK_INFRA_AUD_L_CK] = "aud_l_ck",
> +	[CK_INFRA_AUD_AUD_CK] = "aud_aud_ck",
> +	[CK_INFRA_AUD_EG2_CK] = "aud_eg2_ck",
> +};
> +
> +int mt7986_init_clock(struct mtk_base_afe *afe)
> +{
> +	struct mt7986_afe_private *afe_priv = afe->platform_priv;
> +	int ret, i;
> +
> +	afe_priv->clks = devm_kcalloc(afe->dev, CLK_NUM,
> +				sizeof(*afe_priv->clks), GFP_KERNEL);
> +	if (!afe_priv->clks)
> +		return -ENOMEM;
> +	afe_priv->num_clks = CLK_NUM;
> +
> +	for (i = 0; i < afe_priv->num_clks; i++)
> +		afe_priv->clks[i].id = aud_clks[i];
> +
> +	ret = devm_clk_bulk_get(afe->dev, afe_priv->num_clks, afe_priv->clks);
> +	if (ret)
> +		return dev_err_probe(afe->dev, ret, "Failed to get clocks\n");
> +
> +	return 0;
> +}
> +
> +int mt7986_afe_enable_clock(struct mtk_base_afe *afe)
> +{
> +	struct mt7986_afe_private *afe_priv = afe->platform_priv;
> +	int ret;
> +
> +	ret = clk_bulk_prepare_enable(afe_priv->num_clks, afe_priv->clks);

You don't need a wrapper function for just a single clk_bulk_prepare_enable() call.

> +	if (ret)
> +		return dev_err_probe(afe->dev, ret, "Failed to enable clocks\n");
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(mt7986_afe_enable_clock);
> +
> +int mt7986_afe_disable_clock(struct mtk_base_afe *afe)
> +{
> +	struct mt7986_afe_private *afe_priv = afe->platform_priv;
> +
> +	clk_bulk_disable_unprepare(afe_priv->num_clks, afe_priv->clks);

Same for this one....

... which means that this file will have only mt7986_init_clock() so, ultimately,
you don't need a mt7986-afe-clk.c file at all.
Please merge this logic into mt7986-afe-pcm.c, which is also the only user of it.

Thanks,
Angelo