i2c: i2c-cbus-gpio: introduce driver

Add i2c driver to enable access to devices behind CBUS on Nokia Internet
Tablets.

The patch also adds CBUS I2C configuration for N8x0 which is one of the
users of this driver.

Acked-by: Felipe Balbi <balbi@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>

1 files changed, 42 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/board-n8x0.c b/arch/arm/mach-omap2/board-n8x0.c
index d95f727ca39a..bbfd74263c42 100644
--- a/arch/arm/mach-omap2/board-n8x0.c
+++ b/arch/arm/mach-omap2/board-n8x0.c
@@ -16,10 +16,12 @@
 #include <linux/gpio.h>
 #include <linux/init.h>
 #include <linux/io.h>
+#include <linux/irq.h>
 #include <linux/stddef.h>
 #include <linux/i2c.h>
 #include <linux/spi/spi.h>
 #include <linux/usb/musb.h>
+#include <linux/platform_data/i2c-cbus-gpio.h>
 #include <linux/platform_data/spi-omap2-mcspi.h>
 #include <linux/platform_data/mtd-onenand-omap2.h>
 #include <sound/tlv320aic3x.h>
@@ -39,6 +41,45 @@
 #define TUSB6010_GPIO_ENABLE    0
 #define TUSB6010_DMACHAN        0x3f
 
+#if defined(CONFIG_I2C_CBUS_GPIO) || defined(CONFIG_I2C_CBUS_GPIO_MODULE)
+static struct i2c_cbus_platform_data n8x0_cbus_data = {
+        .clk_gpio = 66,
+        .dat_gpio = 65,
+        .sel_gpio = 64,
+};
+
+static struct platform_device n8x0_cbus_device = {
+        .name   = "i2c-cbus-gpio",
+        .id     = 3,
+        .dev    = {
+                .platform_data = &n8x0_cbus_data,
+        },
+};
+
+static struct i2c_board_info n8x0_i2c_board_info_3[] __initdata = {
+        {
+                I2C_BOARD_INFO("retu-mfd", 0x01),
+        },
+};
+
+static void __init n8x0_cbus_init(void)
+{
+        const int retu_irq_gpio = 108;
+
+        if (gpio_request_one(retu_irq_gpio, GPIOF_IN, "Retu IRQ"))
+                return;
+        irq_set_irq_type(gpio_to_irq(retu_irq_gpio), IRQ_TYPE_EDGE_RISING);
+        n8x0_i2c_board_info_3[0].irq = gpio_to_irq(retu_irq_gpio);
+        i2c_register_board_info(3, n8x0_i2c_board_info_3,
+                                ARRAY_SIZE(n8x0_i2c_board_info_3));
+        platform_device_register(&n8x0_cbus_device);
+}
+#else /* CONFIG_I2C_CBUS_GPIO */
+static void __init n8x0_cbus_init(void)
+{
+}
+#endif /* CONFIG_I2C_CBUS_GPIO */
+
 #if defined(CONFIG_USB_MUSB_TUSB6010) || defined(CONFIG_USB_MUSB_TUSB6010_MODULE)
 /*
  * Enable or disable power to TUSB6010. When enabling, turn on 3.3 V and
@@ -677,6 +718,7 @@ static void __init n8x0_init_machine(void)
         gpmc_onenand_init(board_onenand_data);
         n8x0_mmc_init();
         n8x0_usb_init();
+        n8x0_cbus_init();
 }
 
 MACHINE_START(NOKIA_N800, "Nokia N800")