linux-kernel - Re: [PATCH] ARM: tegra: dts: add aliases and DMA requestor for serial controller

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Date:	Thu, 20 Dec 2012 11:45:30 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...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>
Subject: Re: [PATCH] ARM: tegra: dts: add aliases and DMA requestor for serial
 controller

On Wednesday 19 December 2012 10:30 PM, Stephen Warren wrote:
> On 12/18/2012 11:31 PM, Laxman Dewangan wrote:
>> Add APB DMA requestor and serial aliases for serial controller.
>> There will be two serial driver i.e. 8250 based simple serial driver
>> and APB DMA based serial driver for higher baudrate and performace.
>>
>> The simple serial driver get enabled with compatible nvidia,tegra20-uart
>> and APB DMA based driver will get enabled with compatible
>> nvidia,tegra20-hsuart.
> This patch seems to do two things:
>
> 1) Add a comment describing how to select the basic or DMA-based driver.
> I can see why this is useful.
>
> 2) Add aliases for the serial ports. I have no idea why this is useful.

Serial aliases are added because we want to get the port number like 
/dev/ttyTHS0,  /d/ttyTHS2 etc. The uarta should be /dev/ttyTHS0 and 
uartc should be /dev/ttyTHS2. The port number can be found using aliases 
and of_alias_get_id() in driver file:

port_number = of_alias_get_id(np, "serial");




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