Hi Joachim Eastwood,

On 10/13/2012 1:42, Joachim Eastwood wrote:

Hi Bo Shen,

On Fri, Oct 12, 2012 at 11:42 AM, Bo Shen [off-list ref] wrote:

quoted

The i2c-gpio driver will turn the platform device ID to busnum.
When using platfrom device ID as -1, it means dynamically assigned
the busnum. When writing code, we need to make sure the busnum,
and call i2c_register_board_info(int busnum, ...) to register device
if using -1, we do not know the value of busnum.

In order to solve this issue, set the platform device ID as a fix number
Here using 0 to match the busnum used in i2c_regsiter_board_info().

I have been bitten by this myself on RM9200.

quoted

Signed-off-by: Bo Shen <redacted>
---
Change since v1
   Make the commit message more clear
---
  arch/arm/mach-at91/at91sam9260_devices.c |    2 +-

This pattern exist in at91rm9200_devices.c, at91sam9261_devices.c,
at91sam9263_devices.c and at91sam9rl_devices.c you might want to fix
them as well.

Thanks for your information.
After I test these boards, I will send patches to fix them, while not in 
this patch.

I assume we have the same problem if CONFIG_I2C_AT91 is set?
See further down in at91sam9260_devices.c we have another:  ".id = -1,"

Maybe Nikolaus Voss will deal with this case.

regards
Joachim Eastwood

quoted

  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mach-at91/at91sam9260_devices.c b/arch/arm/mach-at91/at91sam9260_devices.c
index 0f24cfb..805ef95 100644
--- a/arch/arm/mach-at91/at91sam9260_devices.c
+++ b/arch/arm/mach-at91/at91sam9260_devices.c

@@ -389,7 +389,7 @@ static struct i2c_gpio_platform_data pdata = {

  static struct platform_device at91sam9260_twi_device = {
         .name                   = "i2c-gpio",
-       .id                     = -1,
+       .id                     = 0,
         .dev.platform_data      = &pdata,
  };

--

1.7.9.5


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