linux-kernel - Re: [PATCH] soc: mediatek: SCPSYS: use builtin_platform

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Message-ID: <20151222154808.GC12458@windriver.com>
Date:	Tue, 22 Dec 2015 10:48:08 -0500
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	Daniel Kurtz <djkurtz@...omium.org>
CC:	Matthias Brugger <matthias.bgg@...il.com>,
	"moderated list:ARM/Mediatek SoC support" 
	<linux-mediatek@...ts.infradead.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Arnd Bergmann <arnd@...db.de>,
	Eddie Huang (黃智傑) 
	<eddie.huang@...iatek.com>, James Liao <jamesjj.liao@...iatek.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] soc: mediatek: SCPSYS: use builtin_platform_driver

[Re: [PATCH] soc: mediatek: SCPSYS: use builtin_platform_driver] On 22/12/2015 (Tue 21:36) Daniel Kurtz wrote:

> Hi Matthias,
> 
> One thing below is missing from this version of the patch...
> 
> > On Fri, Dec 18, 2015 at 7:19 PM, Matthias Brugger
> > <matthias.bgg@...il.com> wrote:
> >> SCPSYS can't be built as module. Use builtin_platform_driver instead.
> >> For this probe must not be __init and the data accessed can't be
> >> __initconst. Remove this macros. To make the impact as small as possible,
> >> fold scp_domain_data into scp_domain via a pointer.
> 
> [snip]
> 
> >> @@ -542,10 +533,11 @@ static const struct of_device_id of_scpsys_match_tbl[] = {
> >>  };
> >>
> >>  static struct platform_driver scpsys_drv = {
> >> +       .probe = scpsys_probe,
> >>         .driver = {
> >>                 .name = "mtk-scpsys",
> 
> This was in Sascha's version of the patch:
> 
>   .suppress_bind_attrs = true,

Unless you've got a very specific use case where an unbind makes sense
(like a quad port ethernet card, where you unbind one port and then do
PCI pass through of it to a kvm guest for example) then yes, you should
suppress unbind.  So for most drivers aimed at a single device, or where
being built in but unbinding just makes no sense for any possible use
case, then yes you should set the above.

Paul.
--

> 
> Do we still need it now that we use "builtin_platform_driver"?
> 
> >>                 .owner = THIS_MODULE,
> >>                 .of_match_table = of_match_ptr(of_scpsys_match_tbl),
> >>         },
> >>  };
> >> -builtin_platform_driver_probe(scpsys_drv, scpsys_probe);
> >> +builtin_platform_driver(scpsys_drv);
> >> --
> >> 2.6.2
> >>
--
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