[U-Boot] [PATCH 5/6] arm: socfpga: gen5: add readonly clk driver

[Simon Goldschmidt]

Hi Marek,

Am 24.07.2019 um 09:45 schrieb Simon Goldschmidt:
> On Wed, Jul 24, 2019 at 9:31 AM Marek Vasut <marex at denx.de> wrote:
>>
>> On 7/23/19 10:27 PM, Simon Goldschmidt wrote:
>>> This adds clk-gen5 as a readonly DM_CLK driver that can return clocks for
>>> the peripherals.
>>>
>>> Further changes are:
>>> - select DM_CLK for gen5 U-Boot and SPL
>>> - add SPL tags to clock nodes in socfpga-common-u-boot.dtsi
>>> - adjust socfpga.dtsi to provide missing src selection registers
>>> - start 'handoff.dtsi' file for socrates (conatains clock speeds for now)
>>
>> These should likely be separate patches then ?
> 
> Well, in the end, yes. Especially the handoff.dtsi is required for *all*
> socfpga_gen5 boards, so I'll need to adapt the 'qts-filter.sh' script to
> generate it.
> 
> I'll change that script and separate these patches in v2.

I'm in the process of moving all of the 'qts' header files to devicetree 
handoff.dtsi files. CLK and DDR are already working (pinmux/iocsr not 
yet) - but I need to work a bit on DM memory consumption.

So now I'm faced with a question: in which driver do I implement the 
pinmux control? From a DM point of view, it could be a UCLASS_PINCTRL 
driver in 'drivers/pinctrl', but since it's more or less read-only 
unless we'd get more details about the hardware, I'm a bit hesistant to 
do it that way.

Also, the registers are in 'sysmgr', which is handled by the standard 
"syscon" driver right now, so it could well get a UCLASS_SYSCON driver?

I'd appreciate your input on this, given the insight to the Altera 
system you have!

Also, this (and holidays) are delaying this series (I want to put it all 
together in once series), so this will have to wait until after 
v2019.10, I guess?

Regards,
Simon