Just want to document this bug, since I don't have time to make a patch:
In of_mpc8xxx_spi_get_chipselects():
pinfo->alow_flags[i] = flags & OF_GPIO_ACTIVE_LOW;
ret = gpio_direction_output(pinfo->gpios[i],
pinfo->alow_flags[i]);
The initial value of the chip should be disabled. If SPI_CS_HIGH, value of 0
means disabled - ok, but...
If not SPI_CS_HIGH for a given device (which is the case for most devices),
that device will be enabled until it is disabled at the end of the first
transaction to that device. If there are transactions to other devices on the
same bus in the meantime, this device may be confused and fail the first
transaction.
Maybe the chip select should be disabled until the device entry is initialized
with full knowledge of its configuration. Not sure of the right solution.
--
Michael Barkowski
905-482-4577
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