linux-kernel - RE: [PATCH UCC TDM 3/3 ] Modified Documentation to explain dtsentries for TDM driver

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Message-ID: <FBA61160C48B8D438F3323FEFB4EF2C279AFF5@zin33exm24.fsl.freescale.net>
Date:	Fri, 25 Jan 2008 09:28:19 +0530
From:	"Aggrwal Poonam" <Poonam.Aggrwal@...escale.com>
To:	"Wood Scott" <scottwood@...escale.com>
Cc:	"Gala Kumar" <kumar.gala@...escale.com>,
	<akpm@...ux-foundation.org>, <linux-kernel@...r.kernel.org>,
	<netdev@...r.kernel.org>, <rubini@...ion.unipv.it>,
	<linuxppc-dev@...abs.org>,
	"Barkowski Michael" <Michael.Barkowski@...escale.com>,
	"Cutler Richard" <Rich.Cutler@...escale.com>,
	"Tabi Timur" <timur@...escale.com>,
	"Kalra Ashish" <ashish.kalra@...escale.com>
Subject: RE: [PATCH UCC TDM 3/3 ] Modified Documentation to explain dtsentries for TDM driver

Hi Scott

The device tree already has a brg-frequency  property in qe node which
is the value of BRGCLK. The function get_brg_clk uses this property to
find the value of BRGCLK.
In case this value is 0(some older u-boots populate bus-frequency
property of qe and not the brg-frequency), get_brg_clk  uses
bus-frequency/2 as BRGCLK.


With Regards
Poonam 
 
 

-----Original Message-----
From: Wood Scott 
Sent: Friday, January 25, 2008 1:42 AM
To: Aggrwal Poonam
Cc: Gala Kumar; akpm@...ux-foundation.org; linux-kernel@...r.kernel.org;
netdev@...r.kernel.org; rubini@...ion.unipv.it; linuxppc-dev@...abs.org;
Barkowski Michael; Cutler Richard; Tabi Timur; Kalra Ashish
Subject: Re: [PATCH UCC TDM 3/3 ] Modified Documentation to explain
dtsentries for TDM driver

On Thu, Jan 24, 2008 at 10:24:13AM +0530, Poonam_Aggrwal-b10812 wrote:
> +  ix) Baud Rate Generator (BRG)
> +
> +  Required properties:
> +  - compatible : shpuld be "fsl,cpm-brg"
> +  - fsl,brg-sources : define the input clock for all 16 BRGs. The
input
> +    clock source could be 1 to 24 for CLK1 to CLK24. Zero means that
the
> +    particular BRG will be driven by QE clock(BRGCLK).

Should also have a clock-frequency property to specify what BRGCLK is.

-Scott
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