From: He Man <king.of.jungle-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Spansion SPI Probe?
Date: Wed, 23 Dec 2009 10:12:03 +0000 [thread overview]
Message-ID: <70af14ce0912230212p744d2fc4r5445887895dd532@mail.gmail.com> (raw)
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Hi,
I have a ARM11 based SoC with SPI controller in it. The board
contains Spansion S25 SPI flash chip. I am writing the driver
for the SPI controller from scratch but i am missing something in
getting the Spansion chip to be detected. Please help.
Here are the steps.
- Controller driver - I registered a platform_device in the SoC core code.
For the same platform_device name i have a driver registered in
drivers/spi
dir (similar to xilinx spi but no bitbang). The probe works fine. I have
platform_data with bus num and cs set to 0 and mode to SPI_MODE_3. (This
is
the default i use in u-boot and it works fine with Spansion)
- Now for the discrete spansion chip, i found that m25p80 code can be used
as it supports Spansion SPI as well. I loaded the driver but it does not
call m25p80_probe. The name of this driver is "m25p80".
I can understand why the driver did not start probing coz there is no
device
of the name "m25p80" the kernel aware of. But how do i register that
device and where
Thanks,
C
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