[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>
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@ -558,8 +558,11 @@ void __init at91_add_device_spi(struct spi_board_info *devices, int nr_devices)
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else
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cs_pin = spi_standard_cs[devices[i].chip_select];
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/* enable chip-select pin */
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at91_set_gpio_output(cs_pin, 1);
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if (devices[i].chip_select == 0) /* for CS0 errata */
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at91_set_A_periph(cs_pin, 0);
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else
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at91_set_gpio_output(cs_pin, 1);
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/* pass chip-select pin to driver */
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devices[i].controller_data = (void *) cs_pin;
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