From: Laxman Dewangan <ldewangan@nvidia.com>
To: Stephen Warren <swarren@wwwdotorg.org>
Cc: "linux@arm.linux.org.uk" <linux@arm.linux.org.uk>,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] ARM: tegra: dts: add aliases and DMA requestor for serial controller
Date: Thu, 20 Dec 2012 11:45:30 +0530 [thread overview]
Message-ID: <50D2AD02.6060101@nvidia.com> (raw)
In-Reply-To: <50D1F2CB.3090206@wwwdotorg.org>
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");
next prev parent reply other threads:[~2012-12-20 6:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-19 6:31 [PATCH] ARM: tegra: dts: add aliases and DMA requestor for serial controller Laxman Dewangan
2012-12-19 17:00 ` Stephen Warren
2012-12-20 6:15 ` Laxman Dewangan [this message]
2012-12-20 17:03 ` Stephen Warren
2012-12-21 4:18 ` Laxman Dewangan
2012-12-21 20:50 ` Stephen Warren
2012-12-22 20:15 ` Laxman Dewangan
2012-12-25 5:33 ` Stephen Warren
2012-12-25 9:43 ` Laxman Dewangan
2012-12-22 20:15 ` Laxman Dewangan
2013-01-02 19:19 ` Stephen Warren
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