Linux/OMAP-L138: Clock device tree support in latest Davinci Git

Part Number:OMAP-L138

Tool/software: Linux

I'm working on implementing a device tree for my OMAP L-138 based platform. I am using Linux and have recently pulled from the most recent davinci git. I realize that this tree pulls from mainline and is currently pulling in rc's, however I feel like this has possibly been a problem for awhile or was never fully supported.

Here is a description of my problem:

1. Compile and load kernel
2. U-Boot starts kernel and passes in device tree blob
3. Kernel decompresses and then ceases to print anything else

I've determined that this is because all

of_platform_serial_probe

calls are failing, leaving the kernel without a valid console. Here is the chain of calls that cause the probe to fail:

1. of_platform_serial_probe
   1. of_platform_serial_setup
      1. devm_clk_get
         1. clk_get

Looking at the disassemby, I see that

__of_clk_get_by_name

is compiled out of the clk_get call (pulled from CCS):

E2503000 SUBS          R3, R0, #0x0
01A00003 MOVEQ         R0, R3
0A000002 BEQ           0xC018F9DC
E593002C LDR           R0, [R3, #0x2C]
E3500000 CMP           R0, #0x0
05930008 LDREQ         R0, [R3, #0x8]
EAFFFFBF B             clk_get_sys

This means that clk_get_sys get called with dev_id = "1d0c000.serial" or a similar address. However, the file da850.c sets up the device id's for the uart clocks as follows:

static struct clk_lookup da850_clks[] = {
...
        CLK("serial8250.0",     NULL,           &uart0_clk),
        CLK("serial8250.1",     NULL,           &uart1_clk),
        CLK("serial8250.2",     NULL,           &uart2_clk),
...
};

This causes clock lookup and thus probe to fail.

I believe this is because CONFIG_COMMON_CLK is not set, causing 

__of_clk_get_by_name

to be invalid. Going through the menuconfig, I don't clearly see any way to enable this.

Is there something that I'm missing here to get device tree clock lookup to work correctly on my platform? Am I actually supposed to be able to enable this option? Or is there another solution to get this working correctly without modifying 8250/clk kernel code?

As a workaround I could rename all of the clock dev_id's to "address.device" in da850.c, but that seems like an incorrect solution to my problem.