linux-kernel - Re: [PATCH 3/3] usb: ohci-at91: use device managed clk retrieval

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Date:	Tue, 03 Dec 2013 18:20:13 +0100
From:	boris brezillon <b.brezillon@...rkiz.com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Douglas Gilbert <dgilbert@...erlog.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	Grant Likely <grant.likely@...aro.org>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/3] usb: ohci-at91: use device managed clk retrieval

Hello Sergei,

On 03/12/2013 19:01, Sergei Shtylyov wrote:
> Hello.
>
> On 12/03/2013 05:07 PM, Boris BREZILLON wrote:
>
>> Replace clk_get calls by devm_clk_get calls.
>
>> Signed-off-by: Boris BREZILLON <b.brezillon@...rkiz.com>
>> Tested-by: Robert Nelson <robertcnelson@...il.com>
>> ---
>>   drivers/usb/host/ohci-at91.c |   32 ++++++++------------------------
>>   1 file changed, 8 insertions(+), 24 deletions(-)
>
>> diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
>> index c406f1e..3652962 100644
>> --- a/drivers/usb/host/ohci-at91.c
>> +++ b/drivers/usb/host/ohci-at91.c
>> @@ -164,30 +164,30 @@ static int usb_hcd_at91_probe(const struct 
>> hc_driver *driver,
>>           goto err;
>>       }
>>
>> -    iclk = clk_get(&pdev->dev, "ohci_clk");
>> +    iclk = devm_clk_get(dev, "ohci_clk");
>>       if (IS_ERR(iclk)) {
>> -        dev_err(&pdev->dev, "failed to get ohci_clk\n");
>> +        dev_err(dev, "failed to get ohci_clk\n");
>
>    You changed this call...
>
>>           retval = PTR_ERR(iclk);
>>           goto err;
>>       }
>> -    fclk = clk_get(&pdev->dev, "uhpck");
>> +    fclk = devm_clk_get(dev, "uhpck");
>>       if (IS_ERR(fclk)) {
>>           dev_err(&pdev->dev, "failed to get uhpck\n");
>
>    ... but not this one.

This is an oversight.

>
>>           retval = PTR_ERR(fclk);
>> -        goto err4;
>> +        goto err;
>>       }
>> -    hclk = clk_get(&pdev->dev, "hclk");
>> +    hclk = devm_clk_get(dev, "hclk");
>>       if (IS_ERR(hclk)) {
>>           dev_err(&pdev->dev, "failed to get hclk\n");
>
>    ... or this one. Actually, I think cganging these calls would be 
> out of scope for this patch.

Ditto.

I'll split the patch to in 2 patches:
  1) replace &pdev->dev by dev
  2) use devm_clk_get instead of clk_get.

>
>>           retval = PTR_ERR(hclk);
>> -        goto err5;
>> +        goto err;
>>       }
>>       if (IS_ENABLED(CONFIG_COMMON_CLK)) {
>> -        uclk = clk_get(&pdev->dev, "usb_clk");
>> +        uclk = devm_clk_get(&pdev->dev, "usb_clk");
>
>    Hm, why not 'dev' like in all of the above?
Ditto.

Thanks for your review.

Best Regards,

Boris
>
>>           if (IS_ERR(uclk)) {
>>               dev_err(&pdev->dev, "failed to get uclk\n");
>>               retval = PTR_ERR(uclk);
>> -            goto err6;
>> +            goto err;
>>           }
>>       }
>>
>
> WBR, Sergei
>
>

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