linux-kernel - Re: [PATCH v2] mailbox: sprd: Use devm_clk_get

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Message-ID: <b8e9e59c-6486-478a-bd25-ee13cbcc46cc@vivo.com>
Date: Wed, 21 Aug 2024 15:08:30 +0800
From: Huan Yang <link@...o.com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>,
 Jassi Brar <jassisinghbrar@...il.com>, Orson Zhai <orsonzhai@...il.com>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 Chunyan Zhang <zhang.lyra@...il.com>, linux-kernel@...r.kernel.org
Cc: opensource.kernel@...o.com
Subject: Re: [PATCH v2] mailbox: sprd: Use devm_clk_get_enabled() helpers


在 2024/8/21 15:00, Christophe JAILLET 写道:
> Le 21/08/2024 à 03:39, 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().
>>
>> Due to clk only used in probe, not in suspend\resume, this pointer can
>> remove from sprd_mbox_priv to save a little memory.
>>
>> Signed-off-by: Huan Yang <link@...o.com>
>> Suggested-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>
>
> Nitpick: no need to add this S-b. I just made a comment when looking 
> at your patch in order to improve it. I'm not the one that suggested 
> the initial change. All merit is yours.
Your suggestion is helpfull, help this patch be better.
>
> Also, I think that, if used, it should be above your Signed-off.
Hmmm, it's neccessary? If so, I'd like to update it.
>
>
> Reviewed-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>
>> ---
>> v1 -> v2: remove clk pointer from sprd_mbox_priv
>>
>>   drivers/mailbox/sprd-mailbox.c | 25 ++++---------------------
>>   1 file changed, 4 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/mailbox/sprd-mailbox.c 
>> b/drivers/mailbox/sprd-mailbox.c
>> index 9ae57de77d4d..ee8539dfcef5 100644
>> --- a/drivers/mailbox/sprd-mailbox.c
>> +++ b/drivers/mailbox/sprd-mailbox.c
>> @@ -62,7 +62,6 @@ struct sprd_mbox_priv {
>>       void __iomem        *outbox_base;
>>       /*  Base register address for supplementary outbox */
>>       void __iomem        *supp_base;
>> -    struct clk        *clk;
>>       u32            outbox_fifo_depth;
>>         struct mutex        lock;
>> @@ -291,19 +290,13 @@ static const struct mbox_chan_ops sprd_mbox_ops 
>> = {
>>       .shutdown    = sprd_mbox_shutdown,
>>   };
>>   -static void sprd_mbox_disable(void *data)
>> -{
>> -    struct sprd_mbox_priv *priv = data;
>> -
>> -    clk_disable_unprepare(priv->clk);
>> -}
>> -
>>   static int sprd_mbox_probe(struct platform_device *pdev)
>>   {
>>       struct device *dev = &pdev->dev;
>>       struct sprd_mbox_priv *priv;
>>       int ret, inbox_irq, outbox_irq, supp_irq;
>>       unsigned long id, supp;
>> +    struct clk *clk;
>>         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
>>       if (!priv)
>> @@ -331,20 +324,10 @@ static int sprd_mbox_probe(struct 
>> platform_device *pdev)
>>       if (IS_ERR(priv->outbox_base))
>>           return PTR_ERR(priv->outbox_base);
>>   -    priv->clk = devm_clk_get(dev, "enable");
>> -    if (IS_ERR(priv->clk)) {
>> +    clk = devm_clk_get_enabled(dev, "enable");
>> +    if (IS_ERR(clk)) {
>>           dev_err(dev, "failed to get mailbox clock\n");
>> -        return PTR_ERR(priv->clk);
>> -    }
>> -
>> -    ret = clk_prepare_enable(priv->clk);
>> -    if (ret)
>> -        return ret;
>> -
>> -    ret = devm_add_action_or_reset(dev, sprd_mbox_disable, priv);
>> -    if (ret) {
>> -        dev_err(dev, "failed to add mailbox disable action\n");
>> -        return ret;
>> +        return PTR_ERR(clk);
>>       }
>>         inbox_irq = platform_get_irq_byname(pdev, "inbox");
>