[U-Boot] [PATCH] dm: implement a cfi flash uclass

[Thomas Chou <thomas@wytron.com.tw>]

Hi Simon,

On 10/09/2015 09:31 PM, Thomas Chou wrote:
>>> +       ret = uclass_get_device(UCLASS_CFI_FLASH, i, &dev);
>>> +       if (ret)
>>> +               return ret;
>>> +       if (!dev)
>>> +               return -ENODEV;
>>
>> That function will never return a NULL dev, unless it returns an
>> error. It is different from uclass_first_device(). Also are you sure
>> you want uclass_get_device() and not uclass_get_device_by_seq()?
>
> Yes, I should use by_seq. Thanks for reminding.

I tried uclass_get_device_by_seq(), but it failed without proper seq 
assignment. So I reverted uclass_get_device(), as we didn't assign seq 
for a single cfi-flash.

cfi_flash_64m: flash at 0x0 {
	compatible = "cfi-flash";
	reg = <0x00000000 0x04000000>;


I have a problem on device tree decoding. Would you please give me some 
light on decoding with multiple "reg" tuples, like this,

	reg = <0 0x00000000 0x02000000
	       0 0x02000000 0x02000000>;
or,

tse_mac: ethernet at 0x4000 {
	compatible = "altr,tse-1.0";
	reg = <0x00004000 0x00000400>,
		<0x00004400 0x00000040>,
		<0x00004800 0x00000040>,
		<0x00002000 0x00002000>;
	reg-names = "control_port", "rx_csr", "tx_csr", "s1";

Thank you in advance.

Best regards,
Thomas