Hi,
I've a PPC8313e based board running linux2.6.29 on it. Also I've a
FRAM interfaced to it via SPI. This FRAM almost similar to SPI based
EEPROM, so I'm trying to use EEPROM's driver AT25.
Kernel Configuration :
SPI support --> selected
Freescale MPC83xx/QUICC Engine SPI controller --> selected
(Actually I've replaced MPC83xx's controller driver with modified
MPC8XXX's(from 2.6.31) one for it was not getting probed,)
User mode SPI device driver support --> selected
DTS File;
s...@7000 {
cell-index = <0>;
compatible = "fsl,spi";
reg = <0x7000 0x1000>;
interrupts = <16 0x8>;
interrupt-parent = <&ipic>;
mode = "cpu";
f...@0{
compatible =
"ramtron,fm25"; -->(Modified at25 as fm25 )
spi-max-frequency =
<100000000>;
reg = <0>;
};
};
and we are forcing following values in AT25 driver
byte_len = 65536;
name = fram-spi
page_size = 65535;
flags = EE_ADDR2;
Problem:
Drivers are getting complied. But I'm not sure how to acces(i.e,
read/write) the actual SPI-FRAM device.
Should I use
1. /dev/spi/X nodes created by spidev driver
When I use this node, open fails with ERRNO 6
or
2. /sys/bus/spi/devices/spi32766.0/eeprom file.
When I use this sysfs file,Im not able to read / write
properly
Queries:
1. What will be device nodes for this custom at25(fm25) driver,
which registers to spi.c driver?
2. Is spidev.c involved in this picture?
Any help/directions in this regard will of great help.
Thanks n Regards
dhina
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