Quoting Claudiu Beznea (2020-08-24 23:59:10)
> SAMA5D2 datasheet specifies on chapter 33.22.8 (PMC Clock Generator
> Main Oscillator Register) that writing any value other than
> 0x37 on KEY field aborts the write operation. Use the key when
> selecting main clock parent.
>
> Fixes: 27cb1c2083373 ("clk: at91: rework main clk implementation")
> Signed-off-by: Claudiu Beznea <claudiu.bez...@microchip.com>
> Reviewed-by: Alexandre Belloni <alexandre.bell...@bootlin.com>
> ---Applied to clk-next
