From: "Eric Miao" <eric.y.miao@gmail.com>
To: "Paul Sokolovsky" <pmiscml@gmail.com>
Cc: linux-arm-kernel@lists.arm.linux.org.uk, linux-kernel@vger.kernel.org
Subject: Re: [RFC, PATCH 1/3] gpiodev - API definitions
Date: Wed, 11 Apr 2007 08:30:45 +0800 [thread overview]
Message-ID: <f17812d70704101730x601eaa2cr96fe3502ceb20a0f@mail.gmail.com> (raw)
In-Reply-To: <774343545.20070411003058@gmail.com>
it looks ok, but I have several questions:
1. why should we bind this to platform_device, what if the gpio device
is not actually a "platform_device", say, a I2C device, a SPI device or
even a USB device?
2. I still doubt the benefit of using of a structure for a gpio, isn't a gpio
number not enough?
3. If one is going to use a GPIO, he has to initialize a "struct gpio"
before that, how is he suppose to know the value for "gpio->gpio_dev"?
4. how can we optimize to a direct register access instruction (e.g.
to GPDR in PXA) for bit-banging operation (pardon me, I don't exactly
remember the name for such operation, maybe bit-banging)
next prev parent reply other threads:[~2007-04-11 0:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-10 21:30 Paul Sokolovsky
2007-04-11 0:30 ` Eric Miao [this message]
2007-04-11 2:11 ` Paul Sokolovsky
2007-04-11 6:47 ` Juergen Schindele
2007-04-11 7:42 ` Russell King
2007-04-12 14:31 ` Paul Sokolovsky
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