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Message-Id: <200710151810.02291.rgetz@blackfin.uclinux.org>
Date: Mon, 15 Oct 2007 18:10:02 -0400
From: Robin Getz <rgetz@...ckfin.uclinux.org>
To: "Andrew Morton" <akpm@...ux-foundation.org>
Cc: "Bryan Wu" <bryan.wu@...log.com>, dmitry.torokhov@...il.com,
linux-input@...ey.karlin.mff.cuni.cz,
linux-joystick@...ey.karlin.mff.cuni.cz,
linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] Blackfin serial driver: this driver enable SPORTs on Blackfin emulate UART
On Mon 15 Oct 2007 16:33, Andrew Morton pondered:
>
> > Subject: [PATCH 3/3] Blackfin serial driver: this driver enable SPORTs
> on Blackfin emulate UART
>
> That's a bit hard to parse.
>
Blackfin's have a synchronous Serial Peripheral pORT (SPORT).
Unlike SPI, UART, I2C, or CAN interfaces which are designed for specific
industry standard compatible communication only, the SPORT support a variety
(software programmable) serial data communication protocols:
- A-law or ยต-law companding according to G.711 specification
- Multichannel or Time-Division-Multiplexed (TDM) modes
- Stereo Audio I2S Mode
- TDM Modes for Multi-Channel audio codecs
- H.100 Telephony standard support
- others, but if anyone really cares, they need to read the chip specs...
Bryan's patch takes the SPORT, and makes a standard UART out of it
(exposing /dev/ttySS0) for those people who don't have enough hardware UARTs
in their system.
Is it a SPORT driver that emulates a UART, or a UART driver on the SPORT? I
think it is the latter...
Maybe:
[PATCH 3/3] Blackfin serial driver: enables a UART interface for the SPORT
Which still doesn't make any sense, until you know what a SPORT is :)
-Robin
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