linux-kernel - Re: [resend PATCH v6 10/12] clk: mediatek: mt8183: switch mmsys to platform device probing

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Date:   Mon, 9 Dec 2019 16:51:11 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     <matthias.bgg@...nel.org>
CC:     <robh+dt@...nel.org>, <mark.rutland@....com>,
        <p.zabel@...gutronix.de>, <airlied@...ux.ie>,
        <mturquette@...libre.com>, <sboyd@...nel.org>,
        <ulrich.hecht+renesas@...il.com>,
        <laurent.pinchart@...asonboard.com>,
        <enric.balletbo@...labora.com>, <sean.wang@...iatek.com>,
        <sean.wang@...nel.org>, <rdunlap@...radead.org>, <wens@...e.org>,
        <hsinyi@...omium.org>, <frank-w@...lic-files.de>,
        <drinkcat@...omium.org>, <linux-media@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <mbrugger@...e.com>
Subject: Re: [resend PATCH v6 10/12] clk: mediatek: mt8183: switch mmsys to
 platform device probing

Hi, Matthias:

On Sat, 2019-12-07 at 23:47 +0100, matthias.bgg@...nel.org wrote:
> From: Matthias Brugger <mbrugger@...e.com>
> 
> Switch probing for the MMSYS to support invocation to a
> plain paltform device. The driver will be probed by the DRM subsystem.
> 
> Singed-off-by: Matthias Brugger <mbrugger@...e.com>
> ---
>  drivers/clk/mediatek/clk-mt8183-mm.c | 39 +++++++++++++++++++---------
>  1 file changed, 27 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/clk/mediatek/clk-mt8183-mm.c b/drivers/clk/mediatek/clk-mt8183-mm.c
> index 720c696b506d..e6dcad18d81a 100644
> --- a/drivers/clk/mediatek/clk-mt8183-mm.c
> +++ b/drivers/clk/mediatek/clk-mt8183-mm.c
> @@ -3,14 +3,20 @@
>  // Copyright (c) 2018 MediaTek Inc.
>  // Author: Weiyi Lu <weiyi.lu@...iatek.com>
>  
> +#include <linux/module.h>
>  #include <linux/clk-provider.h>
>  #include <linux/platform_device.h>
> +#include <linux/slab.h>
>  
>  #include "clk-mtk.h"
>  #include "clk-gate.h"
>  
>  #include <dt-bindings/clock/mt8183-clk.h>
>  
> +struct clk_mt8183_mm_priv {
> +	struct clk_onecell_data *clk_data;
> +};
> +
>  static const struct mtk_gate_regs mm0_cg_regs = {
>  	.set_ofs = 0x104,
>  	.clr_ofs = 0x108,
> @@ -84,28 +90,37 @@ static const struct mtk_gate mm_clks[] = {
>  
>  static int clk_mt8183_mm_probe(struct platform_device *pdev)
>  {
> -	struct clk_onecell_data *clk_data;
> -	struct device_node *node = pdev->dev.of_node;
> +	struct clk_mt8183_mm_priv *private;
> +	struct device_node *node = pdev->dev.parent->of_node;
> +
> +	private = devm_kzalloc(&pdev->dev, sizeof(*private), GFP_KERNEL);
> +	if (!private)
> +		return -ENOMEM;
>  
> -	clk_data = mtk_alloc_clk_data(CLK_MM_NR_CLK);
> +	private->clk_data = mtk_alloc_clk_data(CLK_MM_NR_CLK);
> +	platform_set_drvdata(pdev, private);

There is a more simple modification that you need not to define struct
clk_mt8183_mm_priv,

clk_data = mtk_alloc_clk_data(CLK_MM_NR_CLK);
platform_set_drvdata(pdev, clk_data);

Regards,
CK

>  
>  	mtk_clk_register_gates(node, mm_clks, ARRAY_SIZE(mm_clks),
> -			clk_data);
> +			private->clk_data);
>  
> -	return of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
> +	return of_clk_add_provider(node, of_clk_src_onecell_get,
> +			private->clk_data);
>  }
>  
> -static const struct of_device_id of_match_clk_mt8183_mm[] = {
> -	{ .compatible = "mediatek,mt8183-mmsys", },
> -	{}
> -};
> +static int clk_mt8183_mm_remove(struct platform_device *pdev)
> +{
> +	struct clk_mt8183_mm_priv *private = platform_get_drvdata(pdev);
> +
> +	kfree(private->clk_data);
> +
> +	return 0;
> +}
>  
>  static struct platform_driver clk_mt8183_mm_drv = {
>  	.probe = clk_mt8183_mm_probe,
> +	.remove = clk_mt8183_mm_remove,
>  	.driver = {
>  		.name = "clk-mt8183-mm",
> -		.of_match_table = of_match_clk_mt8183_mm,
>  	},
>  };
> -
> -builtin_platform_driver(clk_mt8183_mm_drv);
> +module_platform_driver(clk_mt8183_mm_drv);