linux-kernel - Re: [PATCH V3 4/8] phy: Initialize phy core with subsys

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Message-ID: <52EA412F.7070005@ti.com>
Date:	Thu, 30 Jan 2014 17:40:23 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Pratyush Anand <pratyush.anand@...com>
CC:	Mohit KUMAR DCG <Mohit.KUMAR@...com>,
	"arnd@...db.de" <arnd@...db.de>,
	spear-devel <spear-devel@...t.st.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH V3 4/8] phy: Initialize phy core with subsys_initcall

Hi,

On Thursday 30 January 2014 05:22 PM, Pratyush Anand wrote:
> On Thu, Jan 30, 2014 at 07:43:37PM +0800, Kishon Vijay Abraham I wrote:
>> Hi,
>>
>> On Thursday 30 January 2014 04:18 PM, Mohit Kumar wrote:
>>> From: Pratyush Anand <pratyush.anand@...com>
>>>
>>> PCIe RC drivers are initialized with subsys_initcall. Few PCIe drivers
>>> like SPEAr13xx needs phy drivers to be initialized.
>>
>> Instead change PCIe RC drivers to module init. Phy drivers should be loaded
>> very early otherwise. (Hint: drivers/Makefile).
> 
> I think PCIe RC driver can not be made module init. Bjorn can comment
> better.

Why not? I have used it for DRA7xx without any issues (I'll send that one
upstream once the PIPE3 phy part gets clear).
> 
> All PCIe card drivers are initialized with module init. RC driver must
> have been initialized before any card driver initialization.
> Currently, card drivers does not have deferred probe concept, so I am
> not sure if keeping RC driver as module init will work always.

the card drivers will anyway be probed only after RC driver comes up no?
> 
> By the way, is there any side effect of loading phy driver very early?

I assume you meant 'is there any side effect of using subsys_initcall?', since
phy driver is loaded early anyway.
The answer is no just that module_init is common one and more people prefer to
use module_init. (btw initial versions of phy-core had susbsys_initcall before
it got changed to use module_init)

Thanks
Kishon
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