[PATCH v1 3/6] clk: microchip: mpfs: fix reference clock handling

[Leo Liang]

On Tue, Oct 25, 2022 at 08:58:46AM +0100, Conor Dooley wrote:
> The original devicetrees for PolarFire SoC messed up & defined the
> msspll's output as a fixed-frequency, 600 MHz clock & used that as the
> input for the clock controller node. The msspll is not a fixed
> frequency clock and later devicetrees handled this properly. Check the
> devicetree & if it is one of the fixed ones, register the msspll.
> Otherwise, skip registering it & pass the reference clock directly to
> the cfg clock registration function so that existing devicetrees are
> not broken by this change.
> 
> As the MSS PLL is not a "cfg" or a "periph" clock, add a new driver for
> it, based on the one in Linux.
> 
> Fixes: 2f27c9219e ("clk: Add Microchip PolarFire SoC clock driver")
> Signed-off-by: Conor Dooley <conor.dooley at microchip.com>
> ---
>  drivers/clk/microchip/mpfs_clk.c        |  23 ++++-
>  drivers/clk/microchip/mpfs_clk.h        |   8 ++
>  drivers/clk/microchip/mpfs_clk_msspll.c | 119 ++++++++++++++++++++++++
>  3 files changed, 149 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/clk/microchip/mpfs_clk_msspll.c

Reviewed-by: Leo Yu-Chi Liang <ycliang at andestech.com>