[PATCH 6/9] riscv: dts: microchip: mpfs: Fix reference clock node

[Conor.Dooley at microchip.com]

On 26/11/2021 09:48, Krzysztof Kozlowski wrote:
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> 
> On 25/11/2021 16:31, Geert Uytterhoeven wrote:
>> "make dtbs_check" reports:
>>
>>      arch/riscv/boot/dts/microchip/microchip-mpfs-icicle-kit.dt.yaml: soc: refclk: {'compatible': ['fixed-clock'], '#clock-cells': [[0]], 'clock-frequency': [[600000000]], 'clock-output-names': ['msspllclk'], 'phandle': [[7]]} should not be valid under {'type': 'object'}
>>        From schema: dtschema/schemas/simple-bus.yaml
>>
>> Fix this by moving the node out of the "soc" subnode.
>> While at it, rename it to "msspllclk", and drop the now superfluous
>> "clock-output-names" property.
>>
>> Signed-off-by: Geert Uytterhoeven <geert at linux-m68k.org>
>> ---
>>   arch/riscv/boot/dts/microchip/microchip-mpfs.dtsi | 13 ++++++-------
>>   1 file changed, 6 insertions(+), 7 deletions(-)
>>
> 
> It is also logical because refclk usually is not a property of the SoC.
> It actually might be a property of board...
This is one of the fun FPGAisms like the GPIO interrupt configuration. 
This clock setting is determined by what design has been loaded onto the 
FPGA - the msspll outputs are configurable, I could redo my FPGA design 
and change this to 500 MHz etc. In turn the msspll clock is set by 
another clock source that is actually on the board of either 100 or 125 MHz.

Since it's not set at bitstream programming time, I would agree that 
that property should be moved to out of mpfs.dtsi.
> 
> 
> Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski at canonical.com>
> 
> 
> Best regards,
> Krzysztof
>