Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2743f0c1dcca54d6c80b0de1273b3f4e90051a85
Commit: 2743f0c1dcca54d6c80b0de1273b3f4e90051a85
Parent: 6d2a8401d27e3eb8b71d09dd67e0e7d0085b5e29
Author: Andrew Victor <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 23 09:29:46 2008 +0100
Committer: Russell King <[EMAIL PROTECTED]>
CommitDate: Sat Jan 26 15:00:32 2008 +0000
[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 <[EMAIL PROTECTED]>
Signed-off-by: Russell King <[EMAIL PROTECTED]>
---
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 ea9a952..ef6aeb8 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;
-
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