Re: Protocol driver probe function never invoked

[llandre <r&d2-4VKA1VU3ct/j+vYz1yj4TQ@public.gmane.org>]

> On Tuesday 24 July 2007, David Brownell wrote:
>> I want to be sure I understand this correctly.  You're saying that
>> the call to spi_setup() inside of spi_new_device() failed silently?
No, I did not make myself clear.
I was talking about this code in spi_imx.c:

	/* SPI datarate */
	tmp = spi_data_rate(spi->max_speed_hz);
	if (tmp == SPI_CONTROL_DATARATE_BAD) {
		status = -EINVAL;
		dev_err(&spi->dev,
			"setup - "
			"HW min speed (%d Hz) exceeds required "
			"max speed (%d Hz)\n",
			spi_speed_hz(SPI_CONTROL_DATARATE_MIN),
			spi->max_speed_hz);
		if (first_setup)
			goto err_first_setup;
		else
			/* Undo setup using chip as backup copy */


Since the reference clock feeding the SPI controller was too high, it 
was not able to generate the required SPI clock. Probably I did not pay 
enough attention, but it seems kernel did not print these error messages 
so it took a while to recognize that the this was the problem.



-- 
llandre

DAVE Electronics System House - R&D Department
web:   http://www.dave-tech.it
email: r&d2-4VKA1VU3ct/j+vYz1yj4TQ@public.gmane.org

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