From: Wolfram Sang <w.sang@pengutronix.de>
To: Ben Gardiner <bengardiner@nanometrics.ca>
Cc: spi-devel-general@lists.sourceforge.net,
Grant Likely <grant.likely@secretlab.ca>,
David Brownell <dbrownell@users.sourceforge.net>,
linux-kernel@vger.kernel.org, Michael Buesch <mb@bu3sch.de>
Subject: Re: [RFC][PATCH v2 2/3] spi_bitbang : get nsecs delay from cs during transfer
Date: Tue, 14 Dec 2010 19:08:40 +0100 [thread overview]
Message-ID: <20101214180840.GB4584@pengutronix.de> (raw)
In-Reply-To: <AANLkTimdw5crEJTdnObURp_kxqjwFas2RuDMewd=CqEG@mail.gmail.com>
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Hi Ben,
> I think it is starting to sink-in that a 'slower' spi gpio _driver_ is
> needed. I can think of a couple different ways to make the CS-to-data
> delay assigned to 'nsecs' a per-device feature:
> 1) a flag or 2) a function pointer in struct spi_bitbang. Were you
> thinking of something else entirely?
Nope, just saw (very high-level) that it should be per-device as it
might be feasible to have a fast and a slow bus at the same time. My
advice would be to start coding your favourite solution and check if it
feels right :)
Kind regards,
Wolfram
--
Pengutronix e.K. | Wolfram Sang |
Industrial Linux Solutions | http://www.pengutronix.de/ |
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next prev parent reply other threads:[~2010-12-14 18:08 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-19 22:19 [PATCH][RFC] spi-gpio: implement spidelay() for platforms that configure SLOWER_SPI_GPIO Ben Gardiner
2010-12-09 20:34 ` [RFC][PATCH v2 0/3] slower spi-gpio Ben Gardiner
2010-12-09 20:34 ` [RFC][PATCH v2 1/3] spi-gpio: implement spidelay() for platforms that configure SLOWER_SPI_GPIO Ben Gardiner
2010-12-09 20:34 ` [RFC][PATCH v2 2/3] spi_bitbang : get nsecs delay from cs during transfer Ben Gardiner
2010-12-10 11:46 ` Wolfram Sang
2010-12-14 16:58 ` Ben Gardiner
2010-12-14 18:08 ` Wolfram Sang [this message]
2010-12-14 18:17 ` Ben Gardiner
2010-12-09 20:34 ` [RFC][PATCH v2 3/3] spi-gpio: use _cansleep when CONFIG_SLOWER_SPI_GPIO is defined Ben Gardiner
2010-12-10 4:38 ` [RFC][PATCH v2 0/3] slower spi-gpio David Brownell
2010-12-14 16:58 ` Ben Gardiner
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