linux-kernel - Re: [PATCH v2 05/11] ARM: dt: tegra30: Add device node for APB MISC

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Message-ID: <50E5ADA6.1070904@wwwdotorg.org>
Date:	Thu, 03 Jan 2013 09:11:18 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Prashant Gaikwad <pgaikwad@...dia.com>
CC:	"mturquette@...aro.org" <mturquette@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v2 05/11] ARM: dt: tegra30: Add device node for APB MISC

On 01/02/2013 11:11 PM, Prashant Gaikwad wrote:
> On Thursday 03 January 2013 03:30 AM, Stephen Warren wrote:
>> On 12/27/2012 07:47 AM, Prashant Gaikwad wrote:
>>> APB misc contains multiple registers required by different modules
>>> such as CAR.
>> I don't see a DT binding document that describes what
>> nvidia,tegra30-apbmisc means. Also, the register range for this new node
>> overlaps that for the pinmux node, so they can't both "request" their
>> register region. You may need multiple entries in the apbmisc reg
>> property to avoid this.
> 
> apbmisc reg for Tegra30 can be divided into following entries:
> 
> strap registers
> jtag configuration registers
> pull_up/pull_down control registers
> vclk control registers
> tvdac registers
> chip id revision registers
> pad control registers
> 
> This list is not same for Tegra20 and Tegra30.

OK. It sounds like we need a true APB MISC driver then, to abstract the
differences; the clock driver really shouldn't be touching the APB MISC
registers in all likelihood, unless a subset of the sections you mention
above are truly dedicated to clock functionality.

> OR
> 
> another way is to add chip id revision register region to CAR node as
> done for pinmux node and remove apb misc node.

The pinmux controller doesn't have a reg entry for the chip ID register.
I don't understand what you mean here.
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