linux-kernel - Re: [PATCH v3 3/3] memory: Add Broadcom STB memory controller driver

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Date:   Fri, 12 Aug 2022 10:29:51 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-kernel@...r.kernel.org
Cc:     Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "moderated list:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] memory: Add Broadcom STB memory controller driver

On 8/9/22 02:58, Krzysztof Kozlowski wrote:
> On 02/08/2022 01:09, Florian Fainelli wrote:
>> Add support for configuring the Self Refresh Power Down (SRPD)
>> inactivity timeout on Broadcom STB chips. This is used to conserve power
>> when the DRAM activity is reduced.
>>
> 
> 
>> +static int __maybe_unused brcmstb_memc_resume(struct device *dev)
>> +{
>> +	struct brcmstb_memc *memc = dev_get_drvdata(dev);
>> +
>> +	if (memc->timeout_cycles == 0)
>> +		return 0;
>> +
>> +	return brcmstb_memc_srpd_config(memc, memc->timeout_cycles);
>> +}
>> +
>> +static SIMPLE_DEV_PM_OPS(brcmstb_memc_pm_ops, brcmstb_memc_suspend,
>> +			 brcmstb_memc_resume);
>> +
>> +static struct platform_driver brcmstb_memc_driver = {
>> +	.probe = brcmstb_memc_probe,
>> +	.remove = brcmstb_memc_remove,
>> +	.driver = {
>> +		.name		= "brcmstb_memc",
>> +		.owner		= THIS_MODULE,
> 
> No need, run coccinelle.
> 
>> +		.of_match_table	= brcmstb_memc_of_match,
>> +		.pm		= &brcmstb_memc_pm_ops,
> 
> Shouldn't this be pm_ptr()? and then no need for __maybe_unused in
> brcmstb_memc_resume/suspend.

How can one can remove __maybe_unused without causing a warning for the 
CONFIG_PM=n case, not that I needed to build to convince myself, but 
still did anyway:

drivers/memory/brcmstb_memc.c:275:12: warning: 'brcmstb_memc_resume' 
defined but not used [-Wunused-function]
  static int brcmstb_memc_resume(struct device *dev)
             ^~~~~~~~~~~~~~~~~~~
drivers/memory/brcmstb_memc.c:252:12: warning: 'brcmstb_memc_suspend' 
defined but not used [-Wunused-function]
  static int brcmstb_memc_suspend(struct device *dev)
             ^~~~~~~~~~~~~~~~~~~~

unless you also implied enclosing those functions under an #if 
IS_ENABLED(CONFIG_PM) or something which is IMHO less preferable.
-- 
Florian