* Question about Chip Select Decoding for AT91
@ 2011-08-23 8:30 Roman Lapin
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From: Roman Lapin @ 2011-08-23 8:30 UTC (permalink / raw)
To: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f
Hello. I am newbie in kernel development.
I want to realize chip select decoding function for AT91. And I'm finding
the simplest method for it.
I have some questions:
1. Why sizes of variables u8 spi_device.mode, u16 spi_master.mode_bits and
u32 bad_bits in spi_setup() are different?
I've wanted to use variable spi_device.mode for saving cs_dec flag, but I
couldn't do it, because spi_device.mode is fully used for other flags.
2. I want to use spi_device.controller_data to pass pointer to GPIO array
used for CS pins. If cs_dec flag is set, so I can interpret pointer in
spi_device.controller_data
as pointer to array of CS pins GPIO, in either case it will be interpreted
as one CS pin GPIO. Is it right way?
Sorry for my bad english.
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2011-08-23 8:30 Question about Chip Select Decoding for AT91 Roman Lapin
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