linux-kernel - Re: [RFC][PATCH v2 2/3] spi_bitbang : get nsecs delay from cs during transfer

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Message-ID: <20101214180840.GB4584@pengutronix.de>
Date:	Tue, 14 Dec 2010 19:08:40 +0100
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Ben Gardiner <bengardiner@...ometrics.ca>
Cc:	spi-devel-general@...ts.sourceforge.net,
	Grant Likely <grant.likely@...retlab.ca>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	linux-kernel@...r.kernel.org, Michael Buesch <mb@...sch.de>
Subject: Re: [RFC][PATCH v2 2/3] spi_bitbang : get nsecs delay from cs
 during transfer

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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