i2c-ocores: Can add I2C devices to the bus

There is sometimes a need for the ocores driver to add devices to the
bus when installed.

i2c_register_board_info can not always be used, because the I2C devices
 are not known at an early state, they could for instance be connected
 on a I2C bus on a PCI device which has the Open Cores IP.

i2c_new_device can not be used in all cases either since the resulting
bus nummer might be unknown.

The solution is the pass a list of I2C devices in the platform data to
the Open Cores driver. This is useful for MFD drivers.

Signed-off-by: Richard Röjfors <richard.rojfors.ext@mocean-labs.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

3 files changed, 24 insertions, 0 deletions

diff --git a/Documentation/i2c/busses/i2c-ocores b/Documentation/i2c/busses/i2c-ocores
index cfcebb10d14e..c269aaa2f26a 100644
--- a/Documentation/i2c/busses/i2c-ocores
+++ b/Documentation/i2c/busses/i2c-ocores
@@ -20,6 +20,8 @@ platform_device with the base address and interrupt number. The
 dev.platform_data of the device should also point to a struct
 ocores_i2c_platform_data (see linux/i2c-ocores.h) describing the
 distance between registers and the input clock speed.
+There is also a possibility to attach a list of i2c_board_info which
+the i2c-ocores driver will add to the bus upon creation.
 
 E.G. something like:
 
@@ -36,9 +38,24 @@ static struct resource ocores_resources[] = {
         },
 };
 
+/* optional board info */
+struct i2c_board_info ocores_i2c_board_info[] = {
+        {
+                I2C_BOARD_INFO("tsc2003", 0x48),
+                .platform_data = &tsc2003_platform_data,
+                .irq = TSC_IRQ
+        },
+        {
+                I2C_BOARD_INFO("adv7180", 0x42 >> 1),
+                .irq = ADV_IRQ
+        }
+};
+
 static struct ocores_i2c_platform_data myi2c_data = {
         .regstep        = 2,            /* two bytes between registers */
         .clock_khz      = 50000,        /* input clock of 50MHz */
+        .devices        = ocores_i2c_board_info, /* optional table of devices */
+        .num_devices    = ARRAY_SIZE(ocores_i2c_board_info), /* table size */
 };
 
 static struct platform_device myi2c = {
diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c
index e5193bf75483..3542c6ba98f1 100644
--- a/drivers/i2c/busses/i2c-ocores.c
+++ b/drivers/i2c/busses/i2c-ocores.c
@@ -216,6 +216,7 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
         struct ocores_i2c_platform_data *pdata;
         struct resource *res, *res2;
         int ret;
+        int i;
 
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         if (!res)
@@ -271,6 +272,10 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
                 goto add_adapter_failed;
         }
 
+        /* add in known devices to the bus */
+        for (i = 0; i < pdata->num_devices; i++)
+                i2c_new_device(&i2c->adap, pdata->devices + i);
+
         return 0;
 
 add_adapter_failed:
diff --git a/include/linux/i2c-ocores.h b/include/linux/i2c-ocores.h
index 8ed591b0887e..4d5e57ff6614 100644
--- a/include/linux/i2c-ocores.h
+++ b/include/linux/i2c-ocores.h
@@ -14,6 +14,8 @@
 struct ocores_i2c_platform_data {
         u32 regstep;   /* distance between registers */
         u32 clock_khz; /* input clock in kHz */
+        u8 num_devices; /* number of devices in the devices list */
+        struct i2c_board_info const *devices; /* devices connected to the bus */
 };
 
 #endif /* _LINUX_I2C_OCORES_H */