* What is the purpose of a GPIO controller
@ 2005-02-15 13:49 krishna
2005-02-15 14:08 ` Ian Campbell
0 siblings, 1 reply; 2+ messages in thread
From: krishna @ 2005-02-15 13:49 UTC (permalink / raw)
To: Linux Kernel
Hi,
Can any one tell me what is the purpose of GPIO controllers.
Regards,
Krishna Chaitanya
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: What is the purpose of a GPIO controller
2005-02-15 13:49 What is the purpose of a GPIO controller krishna
@ 2005-02-15 14:08 ` Ian Campbell
0 siblings, 0 replies; 2+ messages in thread
From: Ian Campbell @ 2005-02-15 14:08 UTC (permalink / raw)
To: krishna; +Cc: Linux Kernel
On Tue, 2005-02-15 at 19:19 +0530, krishna wrote:
> Can any one tell me what is the purpose of GPIO controllers.
I'm not sure what question you are asking... GPIO controllers are
clearly for the purpose of controlling GPIO pins. GPIO stands for
general purpose i/o, so they are used for all sorts of things.
For example, hardware designers hook up all sorts of things to GPIO
lines: input switches, reset lines to other chips on the board, leds,
relays. I have boards where an i2c bus has been constructed using 2 gpio
lines, another gpio is used to control the LCD backlight, etc, etc.
Ian.
--
Ian Campbell
Current Noise: Opeth - To Rid the Disease
The pollution's at that awkward stage. Too thick to navigate and too
thin to cultivate.
-- Doug Sneyd
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2005-02-15 14:08 ` Ian Campbell
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