linux-kernel - Re: [PATCH] nvmem: jz4780-efuse: Use devm_clk_get

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Message-ID: <dfe8d6e9-97f8-46e9-bbd5-ebe9d11ca625@vivo.com>
Date: Wed, 21 Aug 2024 09:15:16 +0800
From: Huan Yang <link@...o.com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>,
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
 linux-kernel@...r.kernel.org
Cc: opensource.kernel@...o.com
Subject: Re: [PATCH] nvmem: jz4780-efuse: Use devm_clk_get_enabled() helpers


在 2024/8/20 21:21, Christophe JAILLET 写道:
> Le 20/08/2024 à 12:23, Huan Yang a écrit :
>> The devm_clk_get_enabled() helpers:
>>      - call devm_clk_get()
>>      - call clk_prepare_enable() and register what is needed in order to
>>       call clk_disable_unprepare() when needed, as a managed resource.
>>
>> This simplifies the code and avoids the calls to 
>> clk_disable_unprepare().
>>
>> Signed-off-by: Huan Yang <link@...o.com>
>> ---
>
> Hi,
>
> if you want to go 1 step further, I think that 'clk' can now also be 
> removed from struct jz4780_efuse.

Sensible, I'll update it

Thanks

>
> Just my 2c.
>
> CJ
>
>>   drivers/nvmem/jz4780-efuse.c | 18 +-----------------
>>   1 file changed, 1 insertion(+), 17 deletions(-)
>>
>> diff --git a/drivers/nvmem/jz4780-efuse.c b/drivers/nvmem/jz4780-efuse.c
>> index 0b01b840edd9..2b5badfbf22f 100644
>> --- a/drivers/nvmem/jz4780-efuse.c
>> +++ b/drivers/nvmem/jz4780-efuse.c
>> @@ -131,11 +131,6 @@ static const struct regmap_config 
>> jz4780_efuse_regmap_config = {
>>       .max_register = JZ_EFUDATA(7),
>>   };
>>   -static void clk_disable_unprepare_helper(void *clock)
>> -{
>> -    clk_disable_unprepare(clock);
>> -}
>> -
>>   static int jz4780_efuse_probe(struct platform_device *pdev)
>>   {
>>       struct nvmem_device *nvmem;
>> @@ -146,7 +141,6 @@ static int jz4780_efuse_probe(struct 
>> platform_device *pdev)
>>       unsigned long rd_strobe;
>>       struct device *dev = &pdev->dev;
>>       void __iomem *regs;
>> -    int ret;
>>         efuse = devm_kzalloc(dev, sizeof(*efuse), GFP_KERNEL);
>>       if (!efuse)
>> @@ -161,20 +155,10 @@ static int jz4780_efuse_probe(struct 
>> platform_device *pdev)
>>       if (IS_ERR(efuse->map))
>>           return PTR_ERR(efuse->map);
>>   -    efuse->clk = devm_clk_get(&pdev->dev, NULL);
>> +    efuse->clk = devm_clk_get_enabled(&pdev->dev, NULL);
>>       if (IS_ERR(efuse->clk))
>>           return PTR_ERR(efuse->clk);
>>   -    ret = clk_prepare_enable(efuse->clk);
>> -    if (ret < 0)
>> -        return ret;
>> -
>> -    ret = devm_add_action_or_reset(&pdev->dev,
>> -                       clk_disable_unprepare_helper,
>> -                       efuse->clk);
>> -    if (ret < 0)
>> -        return ret;
>> -
>>       clk_rate = clk_get_rate(efuse->clk);
>>         efuse->dev = dev;
>