[Linux-fbdev-users] Problems claiming resources (PXA, SM501G8)

[Bill G. <bg...@bi...>]

Guys:


I'm using an SM501G8 on a PXA270, linux-2.6.21.1 kernel.  I'm stuck with 
this at boot:

[    1.380000] sm501 sm501.0: SM501 At c181e000: Version 050100a0, 4 Mb, 
IRQ 85
[    1.410000] sm501 sm501.0: CurrentGate      00021807
[    1.420000] sm501 sm501.0: CurrentClock     2a1a0a09
[    1.440000] sm501 sm501.0: PowerModeControl 00000000
[    1.450000] sm501-fb[0] flags 00000200: 13e80000..13e8ffff
[    1.470000] sm501-fb[1] flags 00000200: 13f00000..13f4ffff
[    1.480000] sm501-fb[2] flags 00000200: 10000000..103fffff
[    1.500000] sm501-fb[3] flags 00000400: 00000055..00000055
[    1.520000] sm501-fb.0: failed to claim resource 0
[    1.530000] sm501 sm501.0: error registering sm501-fb (-16)
[    1.550000] returning 0


My resource definition looks like this:


static struct resource sm501_device_resources[] = {
 [0] = {.start = PXA_CS4_PHYS, .end = PXA_CS4_PHYS + (4 * 1024 * 1024) - 
1, .flags = IORESOURCE_MEM,},
 [1] = {.start = PXA_CS4_PHYS + 0x3e00000, .end = PXA_CS4_PHYS + 
0x3e0fffff, .flags = IORESOURCE_MEM,},
 [2] = {.start = IRQ_GPIO(53), .end = IRQ_GPIO(53), .flags = 
IORESOURCE_IRQ,},
};

static struct platform_device sm501_device = {
 .name = "sm501",
 .id = 0,
 .num_resources = ARRAY_SIZE(sm501_device_resources),
 .resource = sm501_device_resources,
};

static struct platform_device *devices[] __initdata = {
 &sm501_device,
...
};

platform_add_devices(devices, ARRAY_SIZE(devices));



All the above was gleaned from staring at the code in sm501.c, so I'm 
probably doing something wrong.  :)   My theory right now is that I'm 
not specifying the right ranges for the resources.  For example, it 
looks like I'm not supposed to resource _all_ the device's control 
register memory, only a little bit (the code in sm501_register_display() 
appears to grab the rest).  But I haven't figured out what the right 
combination of resources is...

Any suggestions?  I'm not registering an "sm501-fb" device, only the 
"sm501" device shown above.


b.g.

-- 
Bill Gatliff
bg...@bi...