* Re: Fwd: PXA270 + ads7846 (TI TSC2046)
[not found] ` <20070504155402.GA25198@zarina>
@ 2007-05-21 3:08 ` David Brownell
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From: David Brownell @ 2007-05-21 3:08 UTC (permalink / raw)
To: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f, cbou-JGs/UdohzUI
Cc: Stephen Street
On Friday 04 May 2007, Anton Vorontsov wrote:
> Why Motorola hardcoded in pxa2xx spi driver? Is that means that with
> Motorola bit set we can do all we can with National bit? If not (and
> from my observation it's not) is that means that we can't use pxa2xx
> spi driver for chips requiring National/Microwire?
Modulo the misconception there -- Microwire being a strict subset
of the pure SPI/Motorola mode -- one other issue came up recently.
It seems that the patch making drivers/input/touchscreen/ads7846.c
use SPI_MODE_1 was incorrect. It should use SPI_MODE_0 ... since
it uses normal clock polarity (CPOL=0) and samples on the leading
edge of that clock (CPHA=0).
When I tested -- with omap_uwire and pxa2xx_spi -- I used SPI_MODE_0;
but it was later changed. It seems that when it's used with the
omap_uwire driver, SPI_MODE_1 also works. That might explain some
of the problems observed...
- Dave
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2007-05-21 3:08 ` Fwd: PXA270 + ads7846 (TI TSC2046) David Brownell
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