linux-kernel - Re: [PATCH v4 1/2] clk: Provide managed helper to get and enable bulk clocks

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Message-ID: <8e336720-ce08-4391-ad36-b83fea246cab@samsung.com>
Date: Mon, 5 Feb 2024 10:19:16 +0100
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: Shradha Todi <shradha.t@...sung.com>, 'Manivannan Sadhasivam'
	<manivannan.sadhasivam@...aro.org>, sboyd@...nel.org,
	mturquette@...libre.com
Cc: linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, jingoohan1@...il.com,
	lpieralisi@...nel.org, kw@...ux.com, robh@...nel.org, bhelgaas@...gle.com,
	krzysztof.kozlowski@...aro.org, alim.akhtar@...sung.com,
	linux@...linux.org.uk, pankaj.dubey@...sung.com
Subject: Re: [PATCH v4 1/2] clk: Provide managed helper to get and enable
 bulk clocks

On 02.02.2024 12:59, Shradha Todi wrote:
>> -----Original Message-----
>> From: Manivannan Sadhasivam<manivannan.sadhasivam@...aro.org>
>> Sent: 29 January 2024 12:25
>> To: Shradha Todi<shradha.t@...sung.com>
>> Subject: Re: [PATCH v4 1/2] clk: Provide managed helper to get and enable bulk
>> clocks
>>
>> On Wed, Jan 24, 2024 at 04:08:37PM +0530, Shradha Todi wrote:
>>> Provide a managed devm_clk_bulk* wrapper to get and enable all bulk
>>> clocks in order to simplify drivers that keeps all clocks enabled for
>>> the time of driver operation.
>>>
>>> Suggested-by: Marek Szyprowski<m.szyprowski@...sung.com>
>>> Signed-off-by: Shradha Todi<shradha.t@...sung.com>
>>> ---
>>>   drivers/clk/clk-devres.c | 40
>> ++++++++++++++++++++++++++++++++++++++++
>>>   include/linux/clk.h      | 24 ++++++++++++++++++++++++
>>>   2 files changed, 64 insertions(+)
>>>
>>> diff --git a/drivers/clk/clk-devres.c b/drivers/clk/clk-devres.c index
>>> 4fb4fd4b06bd..cbbd2cc339c3 100644
>>> --- a/drivers/clk/clk-devres.c
>>> +++ b/drivers/clk/clk-devres.c
>>> @@ -182,6 +182,46 @@ int __must_check devm_clk_bulk_get_all(struct
>>> device *dev,  }  EXPORT_SYMBOL_GPL(devm_clk_bulk_get_all);
>>>
>>> +static void devm_clk_bulk_release_all_enable(struct device *dev, void
>>> +*res) {
>>> +	struct clk_bulk_devres *devres = res;
>>> +
>>> +	clk_bulk_disable_unprepare(devres->num_clks, devres->clks);
>>> +	clk_bulk_put_all(devres->num_clks, devres->clks); }
>>> +
>>> +int __must_check devm_clk_bulk_get_all_enable(struct device *dev,
>>> +					      struct clk_bulk_data **clks) {
>>> +	struct clk_bulk_devres *devres;
>>> +	int ret;
>>> +
>>> +	devres = devres_alloc(devm_clk_bulk_release_all_enable,
>>> +			      sizeof(*devres), GFP_KERNEL);
>>> +	if (!devres)
>>> +		return -ENOMEM;
>>> +
>>> +	ret = clk_bulk_get_all(dev, &devres->clks);
>>> +	if (ret > 0) {
>>> +		*clks = devres->clks;
>>> +		devres->num_clks = ret;
>>> +	} else {
>>> +		devres_free(devres);
>>> +		return ret;
>>> +	}
>> How about:
>>
>> 	ret = clk_bulk_get_all(dev, &devres->clks);
>> 	if (ret <= 0) {
>> 		devres_free(devres);
>> 		return ret;
>> 	}
>>
>> 	*clks = devres->clks;
>> 	devres->num_clks = ret;
>>
>> Even though this patch follows the pattern used by the rest of the APIs in the
>> driver, IMO above makes it more readable.
>>
> Since I have usually seen that maintainers suggest to maintain the coding style of the file, I followed the same.
> If you have a stronger reason to change this, please let me know
> Marek, Michael, Stephen please let us know what do you think about this?

I suggest to keep the same style as is used in the modified file (if it 
doesn't conflict with the rules enforced by checkpatch and kernel's 
coding style).

Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland