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at91rm9200: add i2c support 

use i2c-gpio as the hw ip is broken

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2012-11-01 16:07:22 +01:00 committed by Sascha Hauer
parent 28caf41849
commit dc8b0c0f02
1 changed files with 28 additions and 0 deletions
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28
arch/arm/mach-at91/at91rm9200_devices.c
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@ -18,6 +18,7 @@
#include <mach/gpio.h>
#include <mach/io.h>
#include <mach/at91rm9200_mc.h>
#include <i2c/i2c-gpio.h>
#include <sizes.h>
#include "generic.h"
@ -154,6 +155,33 @@ void __init at91_add_device_nand(struct atmel_nand_data *data)
void __init at91_add_device_nand(struct atmel_nand_data *data) {}
#endif
#if defined(CONFIG_I2C_GPIO)
static struct i2c_gpio_platform_data pdata_i2c = {
.sda_pin = AT91_PIN_PA25,
.sda_is_open_drain = 1,
.scl_pin = AT91_PIN_PA26,
.scl_is_open_drain = 1,
.udelay = 5, /* ~100 kHz */
};
void at91_add_device_i2c(short i2c_id, struct i2c_board_info *devices, int nr_devices)
{
struct i2c_gpio_platform_data *pdata = &pdata_i2c;
i2c_register_board_info(0, devices, nr_devices);
at91_set_GPIO_periph(pdata->sda_pin, 1); /* TWD (SDA) */
at91_set_multi_drive(pdata->sda_pin, 1);
at91_set_GPIO_periph(pdata->scl_pin, 1); /* TWCK (SCL) */
at91_set_multi_drive(pdata->scl_pin, 1);
add_generic_device_res("i2c-gpio", 0, NULL, 0, pdata);
}
#else
void at91_add_device_i2c(short i2c_id, struct i2c_board_info *devices, int nr_devices) {}
#endif
/* --------------------------------------------------------------------
* SPI
* -------------------------------------------------------------------- */