Subject: [ARM] head.S change broke platform device registration?

From: [email-masked] (Marc Zyngier)
Date: Fri, 30 Nov 2012 13:45:22 +0000

On 30/11/12 12:20, Marko Kati? wrote:
>> This is incredibly puzzling. I could understand your board not booting
>> at all because of this patch, but an i2c device missing?
>>
>> Can you see the i2c controller at all? I'll try to dig my PXA270 board
>> and see if I can reproduce your issue.
>>
>>         M.
>> --
>> Jazz is not dead. It just smells funny...
>>
> 
> There are three i2c devices on my board:
> 
> static struct i2c_board_info spitz_i2c_devs[] = {
> 	{
> 		.type		= "wm8750",
> 		.addr		= 0x1b,
> 	}, {
> 		.type		= "max7310",
> 		.addr		= 0x18,
> 		.platform_data	= &akita_pca953x_pdata,
> 	},
> };
> 
> These two are on bus 0.
> 
> static struct i2c_board_info spitz_pi2c_devs[] = {
> 	{
> 		.type		= "isl6271a",
> 		.addr		= 0x0c,
> 		.platform_data	= &isl6271a_info,
> 	},
> };
> 
> This one is on bus 1.
> 
> With commit 424e5994e63326a42012f003f1174f3c363c7b62 applied
> Only the max7310 is missing, the other two register and work fine.
> 
> Now, if i try to register _only_ the max7310 chip, it shows up but it doesn't
> work. In that case i get this:
> 
> gpiochip_add: gpios 204..211 (max7310) failed to register
> pca953x: probe of 0-0018 failed with error -16

Right. So what you need to do is find out why GPIOs 204 to 211 are
unavailable. Something must get clobbered one way or another.

	M.
-- 
Jazz is not dead. It just smells funny...