On Tue, Jun 02, 2009 at 07:52:40PM +0200, Richard R????jfors wrote:
> There is sometimes a need for the ocores driver to add devices to the bus when installed.
please wrap to 72 characters per line.
> 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.
Maybe i2c_register_board_info() needs to check if the bus is extant
or not. Anyone else have any feedback on this suggestion?
> 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. Is
> useful for MFD drivers for instance.
Possibly, but most systems I see know what devices they have before
instantiation so can hard-fix the bus numbering when supplying the MFD
drivers with their data.
> Signed-off-by: Richard R??jfors <richard.rojfors.ext@xxxxxxxxxxxxxxx>
> ---
> Index: linux-2.6.30-rc7/drivers/i2c/busses/i2c-ocores.c
> ===================================================================
> --- linux-2.6.30-rc7/drivers/i2c/busses/i2c-ocores.c (revision 861)
> +++ linux-2.6.30-rc7/drivers/i2c/busses/i2c-ocores.c (revision 862)
> @@ -216,6 +216,7 @@
> struct ocores_i2c_platform_data *pdata;
> struct resource *res, *res2;
> int ret;
> + u8 i;
really, an int will do here, you might find compilers on !x86 archs
will spend time contracting this variable to an u8.
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> if (!res)
> @@ -271,6 +272,10 @@
> 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:
> Index: linux-2.6.30-rc7/include/linux/i2c-ocores.h
> ===================================================================
> --- linux-2.6.30-rc7/include/linux/i2c-ocores.h (revision 861)
> +++ linux-2.6.30-rc7/include/linux/i2c-ocores.h (revision 862)
> @@ -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 */
> };
anyone want to kerneldoc this?
> #endif /* _LINUX_I2C_OCORES_H */
> --
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--
Ben (ben@xxxxxxxxx, http://www.fluff.org/)
'a smiley only costs 4 bytes'
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