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authorAndrew Victor <linux@maxim.org.za>2008-01-23 09:29:46 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-01-26 15:00:32 +0000
commit2743f0c1dcca54d6c80b0de1273b3f4e90051a85 (patch)
tree9a07294ddc3aa731497924bc1980a1455bf6dab5
parent6d2a8401d27e3eb8b71d09dd67e0e7d0085b5e29 (diff)
[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>
-rw-r--r--arch/arm/mach-at91/at91rm9200_devices.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/arm/mach-at91/at91rm9200_devices.c b/arch/arm/mach-at91/at91rm9200_devices.c
index ea9a952fb87..ef6aeb86e98 100644
--- a/arch/arm/mach-at91/at91rm9200_devices.c
+++ b/arch/arm/mach-at91/at91rm9200_devices.c
@@ -558,8 +558,11 @@ 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 */
- at91_set_gpio_output(cs_pin, 1);
+ 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;