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Message-ID: <50D2AD02.6060101@nvidia.com> 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"); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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