linux-kernel - Re: [PATCH] ARM: dts: keystone: use one to one address translations under netcp

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Date:	Thu, 03 Sep 2015 07:48:56 -0700
From:	"santosh.shilimkar@...cle.com" <santosh.shilimkar@...cle.com>
To:	Tony Lindgren <tony@...mide.com>
CC:	"Kwok, WingMan" <w-kwok2@...com>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ssantosh@...nel.org" <ssantosh@...nel.org>,
	"Karicheri, Muralidharan" <m-karicheri2@...com>
Subject: Re: [PATCH] ARM: dts: keystone: use one to one address translations
 under netcp

On 9/3/15 7:26 AM, Tony Lindgren wrote:
> * santosh shilimkar <santosh.shilimkar@...cle.com> [150902 08:55]:
>>
>> I suspected the same. I know back then we started with SERDES code
>> with NETCP but as you already know, its a separate block which
>> is needed for NIC card to work. Its more of phy and hence its
>> having different address space is not surprising.
>
> The point Santosh is making here though is that any drivers
> tinkering with registers belonging to a separate hardware block
> is a recipe for a long term maintenance nightmare with mysterious
> bugs popping up as things are not clocked or powered properly
> or become racy with other drivers.
>
> Each hardware block needs to have it's own driver and then the
> drivers can communicate using some Linux generic APIs like clock,
> regulator, phy, or mailbox frameworks.
>
Right !!

Regards,
Santosh



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