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avr32: improve NGW100 I2C/PMBus setup 

Basic I2C initialization for the NGW100 board:

  - Provide empty i2c device table. Daughtercards may add devices,
    and the ATtiny24 could do stuff too.

  - Set up EXTINT(3) so the ATtiny24 can interrupt the AP7000.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
This commit is contained in:
David Brownell 2008-06-12 12:18:05 -07:00 committed by Haavard Skinnemoen
parent d86d314f67
commit 7ef31e9c4e
1 changed files with 22 additions and 0 deletions
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22
arch/avr32/boards/atngw100/setup.c
View File

@ -9,6 +9,8 @@
*/
#include <linux/clk.h>
#include <linux/etherdevice.h>
#include <linux/irq.h>
#include <linux/i2c.h>
#include <linux/i2c-gpio.h>
#include <linux/init.h>
#include <linux/linkage.h>
@ -147,6 +149,10 @@ static struct platform_device i2c_gpio_device = {
},
};
static struct i2c_board_info __initdata i2c_info[] = {
/* NOTE: original ATtiny24 firmware is at address 0x0b */
};
static int __init atngw100_init(void)
{
unsigned i;
@ -172,12 +178,28 @@ static int __init atngw100_init(void)
}
platform_device_register(&ngw_gpio_leds);
/* all these i2c/smbus pins should have external pullups for
* open-drain sharing among all I2C devices. SDA and SCL do;
* PB28/EXTINT3 doesn't; it should be SMBALERT# (for PMBus),
* but it's not available off-board.
*/
at32_select_periph(GPIO_PIN_PB(28), 0, AT32_GPIOF_PULLUP);
at32_select_gpio(i2c_gpio_data.sda_pin,
AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
at32_select_gpio(i2c_gpio_data.scl_pin,
AT32_GPIOF_MULTIDRV | AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
platform_device_register(&i2c_gpio_device);
i2c_register_board_info(0, i2c_info, ARRAY_SIZE(i2c_info));
return 0;
}
postcore_initcall(atngw100_init);
static int __init atngw100_arch_init(void)
{
/* set_irq_type() after the arch_initcall for EIC has run, and
* before the I2C subsystem could try using this IRQ.
*/
return set_irq_type(AT32_EXTINT(3), IRQ_TYPE_EDGE_FALLING);
}
arch_initcall(atngw100_arch_init);