[ar71xx] register a I2C GPIO expander on the PB44 board

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16747 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/ar71xx/files/arch/mips/ar71xx/mach-pb44.c b/target/linux/ar71xx/files/arch/mips/ar71xx/mach-pb44.c
index 5d98ea5..df5b954 100644 (file)
--- a/target/linux/ar71xx/files/arch/mips/ar71xx/mach-pb44.c
+++ b/target/linux/ar71xx/files/arch/mips/ar71xx/mach-pb44.c
@@ -14,6 +14,9 @@
 #include <linux/platform_device.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/flash.h>
+#include <linux/i2c.h>
+#include <linux/i2c-gpio.h>
+#include <linux/i2c/pcf857x.h>
 
 #include <asm/mips_machine.h>
 #include <asm/mach-ar71xx/ar71xx.h>
@@ -21,6 +24,11 @@
 
 #include "devices.h"
 
+#define PB44_GPIO_I2C_SCL      0
+#define PB44_GPIO_I2C_SDA      1
+
+#define PB44_GPIO_EXP_BASE     16
+
 static struct spi_board_info pb44_spi_info[] = {
        {
                .bus_num        = 0,
@@ -46,6 +54,30 @@ static struct ar71xx_pci_irq pb44_pci_irqs[] __initdata = {
        }
 };
 
+static struct i2c_gpio_platform_data pb44_i2c_gpio_data = {
+       .sda_pin        = PB44_GPIO_I2C_SDA,
+       .scl_pin        = PB44_GPIO_I2C_SCL,
+};
+
+static struct platform_device pb44_i2c_gpio_device = {
+       .name           = "i2c-gpio",
+       .id             = 0,
+       .dev = {
+               .platform_data  = &pb44_i2c_gpio_data,
+       }
+};
+
+static struct pcf857x_platform_data pb44_pcf857x_data = {
+       .gpio_base      = PB44_GPIO_EXP_BASE,
+};
+
+static struct i2c_board_info pb44_i2c_board_info[] __initdata = {
+       {
+               I2C_BOARD_INFO("pcf8575", 0x20),
+               .platform_data  = &pb44_pcf857x_data,
+       },
+};
+
 #define PB44_WAN_PHYMASK       BIT(0)
 #define PB44_LAN_PHYMASK       0
 #define PB44_MDIO_PHYMASK      (PB44_LAN_PHYMASK | PB44_WAN_PHYMASK)
@@ -73,6 +105,11 @@ static void __init pb44_init(void)
 
        ar71xx_pci_init(ARRAY_SIZE(pb44_pci_irqs), pb44_pci_irqs);
 
+       i2c_register_board_info(0, pb44_i2c_board_info,
+                               ARRAY_SIZE(pb44_i2c_board_info));
+
+       platform_device_register(&pb44_i2c_gpio_device);
+
        /* TODO: GPIO LEDs & buttons */
 }