Commit 2743f0c1 authored Jan 23, 2008 by Andrew Victor Committed by Russell King Jan 26, 2008

[ARM] 4760/1: [AT91] SPI CS0 errata on AT91RM9200



Due to errata regarding the handling of SPI CS0 on the AT91RM9200, the
atmel_spi driver drives CS0 from the SPI controller and not as a GPIO
pin.
We therefore need to configure CS0 for use by the controller

Signed-off-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent 6d2a8401

arch/arm/mach-at91/at91rm9200_devices.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -558,9 +558,12 @@ void __init at91_add_device_spi(struct spi_board_info *devices, int nr_devices)
		else
		cs_pin = spi_standard_cs[devices[i].chip_select];

		/* enable chip-select pin */
		if (devices[i].chip_select == 0) /* for CS0 errata */
		at91_set_A_periph(cs_pin, 0);
		else
		at91_set_gpio_output(cs_pin, 1);


		/* pass chip-select pin to driver */
		devices[i].controller_data = (void *) cs_pin;
		}