linux-kernel - Re: [PATCHv3 1/4] ARM: tegra: Add Tegra AHB driver

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Date:	Fri, 4 May 2012 08:17:36 +0200
From:	Hiroshi Doyu <hdoyu@...dia.com>
To:	"swarren@...dotorg.org" <swarren@...dotorg.org>
CC:	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
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	<devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [PATCHv3 1/4] ARM: tegra: Add Tegra AHB driver

From: Stephen Warren <swarren@...dotorg.org>
Subject: Re: [PATCHv3 1/4] ARM: tegra: Add Tegra AHB driver
Date: Thu, 3 May 2012 19:41:35 +0200
Message-ID: <4FA2C34F.5060406@...dotorg.org>

> On 05/03/2012 10:05 AM, Hiroshi DOYU wrote:
> > Tegra AHB Bus conforms to the AMBA Specification (Rev 2.0) Advanced
> > High-performance Bus (AHB) architecture.
> > 
> > The AHB Arbiter controls AHB bus master arbitration. This effectively
> > forms a second level of arbitration for access to the memory
> > controller through the AHB Slave Memory device. The AHB pre-fetch
> > logic can be configured to enhance performance for devices doing
> > sequential access. Each AHB master is assigned to either the high or
> > low priority bin. Both Tegra20/30 have this AHB bus.
> > 
> > Some of configuration param could be passed from DT too.
> 
> > diff --git a/drivers/amba/tegra-ahb.c b/drivers/amba/tegra-ahb.c
> > +static u32 tegra_ahb_gizmo[] = {
> 
> const?

Yes.

> > +static int __init tegra_ahb_module_init(void)
> > +{
> > +	return platform_driver_register(&tegra_ahb_driver);
> > +}
> > +postcore_initcall(tegra_ahb_module_init);
> 
> Can this be a module_init() instead of postcore_initcall()?

Since this driver configures prefetch size from AHB client devices,
it's better to make this driver available before other AHB client
drivers get ready. So "postcore_initcall()" seems to make sense if
there's no other better initcall.

> > +
> > +static void __exit tegra_ahb_module_exit(void)
> > +{
> > +	platform_driver_unregister(&tegra_ahb_driver);
> > +}
> > +module_exit(tegra_ahb_module_exit);
> 
> If so, all of the previous two quoted chunks can be replaced with just:
> 
> module_platform_driver(tegra_ahb_module_init);
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