linux-kernel - Re: [resend PATCH v6 06/12] clk: mediatek: mt2701: switch mmsys to platform device probing

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Message-ID: <f998ae82-fbbd-c5d8-00d6-e2196eac5a5c@gmail.com>
Date:   Thu, 13 Feb 2020 20:11:24 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        matthias.bgg@...nel.org, robh+dt@...nel.org, mark.rutland@....com,
        ck.hu@...iatek.com, p.zabel@...gutronix.de, airlied@...ux.ie,
        mturquette@...libre.com, sboyd@...nel.org,
        ulrich.hecht+renesas@...il.com, laurent.pinchart@...asonboard.com
Cc:     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 06/12] clk: mediatek: mt2701: switch mmsys to
 platform device probing



On 09/12/2019 10:58, Enric Balletbo i Serra wrote:
> Hi Matthias,
> 
> On 7/12/19 23:47, 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.
>>
>> Signed-off-by: Matthias Brugger <mbrugger@...e.com>
>> ---
>>  drivers/clk/mediatek/clk-mt2701-mm.c | 41 ++++++++++++++++++++--------
>>  1 file changed, 29 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/clk/mediatek/clk-mt2701-mm.c b/drivers/clk/mediatek/clk-mt2701-mm.c
>> index 054b597d4a73..4a9433c2b2b8 100644
>> --- a/drivers/clk/mediatek/clk-mt2701-mm.c
>> +++ b/drivers/clk/mediatek/clk-mt2701-mm.c
>> @@ -4,14 +4,20 @@
>>   * Author: Shunli Wang <shunli.wang@...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/mt2701-clk.h>
>>  
>> +struct clk_mt2701_mm_priv {
>> +	struct clk_onecell_data *clk_data;
>> +};
>> +
>>  static const struct mtk_gate_regs disp0_cg_regs = {
>>  	.set_ofs = 0x0104,
>>  	.clr_ofs = 0x0108,
>> @@ -79,23 +85,25 @@ static const struct mtk_gate mm_clks[] = {
>>  	GATE_DISP1(CLK_MM_TVE_FMM, "mm_tve_fmm", "mm_sel", 14),
>>  };
>>  
>> -static const struct of_device_id of_match_clk_mt2701_mm[] = {
>> -	{ .compatible = "mediatek,mt2701-mmsys", },
>> -	{}
>> -};
>> -
>>  static int clk_mt2701_mm_probe(struct platform_device *pdev)
>>  {
>> -	struct clk_onecell_data *clk_data;
>>  	int r;
>> -	struct device_node *node = pdev->dev.of_node;
>> +	struct device_node *node = pdev->dev.parent->of_node;
>> +	struct clk_mt2701_mm_priv *private;
>> +
>> +	private = devm_kzalloc(&pdev->dev, sizeof(*private), GFP_KERNEL);
>> +	if (!private)
>> +		return -ENOMEM;
>>  
>> -	clk_data = mtk_alloc_clk_data(CLK_MM_NR);
>> +	private->clk_data = mtk_alloc_clk_data(CLK_MM_NR);
>> +
>> +	platform_set_drvdata(pdev, private);
>>  
>>  	mtk_clk_register_gates(node, mm_clks, ARRAY_SIZE(mm_clks),
>> -						clk_data);
>> +					private->clk_data);
>>  
>> -	r = of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
>> +	r = of_clk_add_provider(node, of_clk_src_onecell_get,
>> +					private->clk_data);
>>  	if (r)
>>  		dev_err(&pdev->dev,
>>  			"could not register clock provider: %s: %d\n",
>> @@ -104,12 +112,21 @@ static int clk_mt2701_mm_probe(struct platform_device *pdev)
>>  	return r;
>>  }
>>  
>> +static int clk_mt2701_mm_remove(struct platform_device *pdev)
>> +{
>> +	struct clk_mt2701_mm_priv *private = platform_get_drvdata(pdev);
>> +
> 
> I think that private->clk_data->clks is also kallocated and need to be freed?
> 
> But I think that the best approach now is to switch to use devm allocations in
> clk-mt2701-mm.c and this remove function will not be needed.
> 

This is an API change which will affect over 50 drivers. For now I'll fix it by
adding a kfree here. I will send a follow-up patch to fix it in the API.

Good catch!
Matthias

>> +	kfree(private->clk_data);
>> +
>> +	return 0;
>> +}
>> +
>>  static struct platform_driver clk_mt2701_mm_drv = {
>>  	.probe = clk_mt2701_mm_probe,
>> +	.remove = clk_mt2701_mm_remove,
>>  	.driver = {
>>  		.name = "clk-mt2701-mm",
>> -		.of_match_table = of_match_clk_mt2701_mm,
>>  	},
>>  };
>>  
>> -builtin_platform_driver(clk_mt2701_mm_drv);
>> +module_platform_driver(clk_mt2701_mm_drv);
>>