diff options
| author | Andrew Victor <linux@maxim.org.za> | 2008-01-23 09:29:46 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-01-26 15:00:32 +0000 |
| commit | 2743f0c1dcca54d6c80b0de1273b3f4e90051a85 (patch) | |
| tree | 9a07294ddc3aa731497924bc1980a1455bf6dab5 | |
| parent | 6d2a8401d27e3eb8b71d09dd67e0e7d0085b5e29 (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.c | 7 |
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; |