[U-Boot] [PATCH v1 1/2] Revert "powerpc: mpc85xx: remove P2020DS board support"

[Simon Glass]

Hi York,

On 1 February 2016 at 12:37, york sun <york.sun at nxp.com> wrote:
> On 01/31/2016 07:40 AM, Simon Glass wrote:
>> Hi,
>>
>> On 31 January 2016 at 07:19, Bin Meng <bmeng.cn at gmail.com> wrote:
>>> Hi York,
>>>
>>> On Sun, Jan 31, 2016 at 6:03 AM, York Sun <york.sun at nxp.com> wrote:
>>>> This reverts commit 168dcc6cef7a0e13bc52fc8fa8de2866cf4033dc.
>>>> Align with changes since P2020DS was removed, including adding
>>>> these macros to defconfig
>>>>
>>>> CONFIG_SYS_NS16550
>>>> CONFIG_CMD_NET
>>>> CONFIG_NETDEVICES
>>>> CONFIG_E1000
>>>> CONFIG_CMD_DHCP
>>>>
>>>> Remove macros and include from board header file, including
>>>> CONFIG_E1000
>>>> CONFIG_MTD_NAND_VERIFY_WRITE
>>>> CONFIG_SYS_NS16550
>>>> config_cmd_default.h
>>>> CONFIG_CMD_ELF
>>>> CONFIG_CMD_SETEXPR
>>>> CONFIG_CMD_NET
>>>>
>>>
>>> While we bring this board back, I believe we should add driver model
>>> support this this board as well, at least NS16550.
>>
>> Yes, since today is the day we are supposed to have all serial drivers
>> converted over.
>>
>> Other things that could perhaps be converted, and would give PPC a
>> better start on driver model: i2c, mmc, usb, Ethernet, PCI :-)
>>
>
> I will take this chance to convert P2020DS to use DM. Need some guidance here.
> For NS16550, it needs the clock. To keep it simple, let's presume platform data
> is used. My trouble is the clock is not unknown at compiling time. It needs to
> be updated by checking the board/soc configuration after power up. The clock is
> only available after get_clocks() is called in init_sequance. Is there a way I
> can update the clocks before the driver is initialized?
>
> York

See this commit:

858530a8     dm: tegra: Enable driver model for serial

It sets up its own clock.

Regards,
Simon