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i2c-ocores: Can add I2C devices to the bus

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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>
This commit is contained in:
Richard Röjfors 2009-06-05 15:40:32 +02:00 • committed by Ben Dooks
parent 7d85ccd816
commit dd14be4c27
3 changed files with 24 additions and 0 deletions
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17
Documentation/i2c/busses/i2c-ocores
View file

@ -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 dev.platform_data of the device should also point to a struct
ocores_i2c_platform_data (see linux/i2c-ocores.h) describing the ocores_i2c_platform_data (see linux/i2c-ocores.h) describing the
distance between registers and the input clock speed. 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: 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 = { static struct ocores_i2c_platform_data myi2c_data = {
.regstep = 2, /* two bytes between registers */ .regstep = 2, /* two bytes between registers */
.clock_khz = 50000, /* input clock of 50MHz */ .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 = { static struct platform_device myi2c = {

5
drivers/i2c/busses/i2c-ocores.c
View file

@ -216,6 +216,7 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
struct ocores_i2c_platform_data *pdata; struct ocores_i2c_platform_data *pdata;
struct resource *res, *res2; struct resource *res, *res2;
int ret; int ret;
int i;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) if (!res)
@ -271,6 +272,10 @@ static int __devinit ocores_i2c_probe(struct platform_device *pdev)
goto add_adapter_failed; 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; return 0;
add_adapter_failed: add_adapter_failed:

2
include/linux/i2c-ocores.h
View file

@ -14,6 +14,8 @@
struct ocores_i2c_platform_data { struct ocores_i2c_platform_data {
u32 regstep; /* distance between registers */ u32 regstep; /* distance between registers */
u32 clock_khz; /* input clock in kHz */ 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 */ #endif /* _LINUX_I2C_OCORES_H */