From: David Brownell <david-b@pacbell.net>
To: Vitaly Wool <vwool@ru.mvista.com>
Cc: linux-kernel@vger.kernel.org, spi-devel-general@sourceforge.net
Subject: Re: [PATCH 2.6-git] SPI: add set_clock() to bitbang
Date: Thu, 22 Dec 2005 13:37:39 -0800 [thread overview]
Message-ID: <200512221337.39305.david-b@pacbell.net> (raw)
In-Reply-To: <43AB1958.1070407@ru.mvista.com>
> >This is actually not needed. Clocks are set through the setup() method
> ...
>
> Where is it supposed to call setup? I guess it's anyway gonna be
> per-transfer, right?
> Or am I missing something?
When the device is created, the core calls setup() to get things like
chipselect polarity sorted out and put into the inactive state. That
matches the board-specific defaults associated with that device, which
would be a function of voltage, routing, and more.
And from then on, it'd be rare to ever call setup() again ... though
drivers certainly could do that between spi_message interactions with
a given device.
- Dave
next prev parent reply other threads:[~2005-12-22 21:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-22 15:04 [PATCH 2.6-git] SPI: add set_clock() to bitbang Vitaly Wool
2005-12-22 16:40 ` David Brownell
2005-12-22 21:23 ` Vitaly Wool
2005-12-22 21:37 ` David Brownell [this message]
2005-12-22 21:42 ` Vitaly Wool
2005-12-23 0:37 ` David Brownell
2005-12-23 7:08 ` Vitaly Wool
2005-12-23 8:28 ` David Brownell
2005-12-23 8:38 ` Vitaly Wool
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=200512221337.39305.david-b@pacbell.net \
--to=david-b@pacbell.net \
--cc=linux-kernel@vger.kernel.org \
--cc=spi-devel-general@sourceforge.net \
--cc=vwool@ru.mvista.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.