linux-kernel - Re: [PATCH] mfd: ssbi: promote the driver to subsys level

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Message-ID: <541A0C69.1030402@linaro.org>
Date:	Wed, 17 Sep 2014 23:34:17 +0100
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
CC:	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Daniel Walker <dwalker@...o99.com>,
	David Brown <davidb@...eaurora.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mfd: ssbi: promote the driver to subsys level



On 17/09/14 23:25, Lee Jones wrote:
> On Wed, 17 Sep 2014, Lee Jones wrote:
>
>> On Wed, 17 Sep 2014, Srinivas Kandagatla wrote:
>>
>>> On 17 Sep 2014 09:03, "Lee Jones" <lee.jones@...aro.org> wrote:
>>>>
>>>> On Wed, 17 Sep 2014, Srinivas Kandagatla wrote:
>>>>
>>>>> This patch promtes the driver to be at subsystem level as this driver
>>>>> will be used by gpio controller drivers which inturn are used by many
>>>>> platform drivers.
>>>>
>>>> Any reason why you're not using -EPROBE?
>>>>
>>> EPROBE is possible but it's going to add few more cycles to boot time.
>>>
>>> As this driver is a very basic driver on which other drivers depend
>>> ensuring the sequence would improve the boot time.
>>
>> We only tend to promote drivers' init level as a last resort.  If
>> -EPROBE_DEFER is possible, please use that instead.
>
> To conclude for any casual/interested observers; I'd be willing to
> accept the patch if you can provide some metrics that prove boot-time
> is sufficiently increased as a result of using -EPROBE_DEFER.

That's fair enough I will get the details..

>
>>>>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>>>>> ---
>>>>>   drivers/mfd/ssbi.c | 7 ++++++-
>>>>>   1 file changed, 6 insertions(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/drivers/mfd/ssbi.c b/drivers/mfd/ssbi.c
>>>>> index b78942e..4fbe02e 100644
>>>>> --- a/drivers/mfd/ssbi.c
>>>>> +++ b/drivers/mfd/ssbi.c
>>>>> @@ -331,7 +331,12 @@ static struct platform_driver ssbi_driver = {
>>>>>                .of_match_table = ssbi_match_table,
>>>>>        },
>>>>>   };
>>>>> -module_platform_driver(ssbi_driver);
>>>>> +
>>>>> +static int ssbi_init(void)
>>>>> +{
>>>>> +     return platform_driver_register(&ssbi_driver);
>>>>> +}
>>>>> +subsys_initcall(ssbi_init);
>
> Also, as a nasty side-effect of this patch, this module will no longer
> be unloadable, which is probably not what you want.
>
>>>>>   MODULE_LICENSE("GPL v2");
>>>>>   MODULE_VERSION("1.0");
>
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