[PATCH v1 2/6] clk: microchip: mpfs: convert parent rate acquistion to get_get_rate()

[Leo Liang]

On Tue, Oct 25, 2022 at 08:58:45AM +0100, Conor Dooley wrote:
> Currently the clock driver for PolarFire SoC takes a very naive approach
> to the relationship between clocks. It reads the dt to get an input
> clock, assumes that that is fixed frequency, reads the "clock-frequency"
> property & uses that to set up both the "cfg" and "periph" clocks.
> 
> Simplifying for the sake of incremental fixes, the "correct" parentage for
> the clocks currently supported in U-Boot is that the "cfg" clocks should
> be children of the fixed frequency clock in the dt. The AHB clock is one
> of these "cfg" clocks and is the parent of the "periph" clocks.
> 
> Instead of passing the clock rate of the fixed-frequency clock to the
> "cfg" and "periph" registration functions and the name of the parents,
> pass their actual parents & use clk_get_rate() to determine their parents
> rates.
> 
> The "periph" clocks are purely gate clocks and should not be reading the
> AHB clocks registers to determine their rates, as they can simply report
> the output of clk_get_rate() on their parent.
> 
> Signed-off-by: Conor Dooley <conor.dooley at microchip.com>
> ---
>  drivers/clk/microchip/Makefile          |  2 +-
>  drivers/clk/microchip/mpfs_clk.c        | 18 ++++++++----------
>  drivers/clk/microchip/mpfs_clk.h        | 12 ++++--------
>  drivers/clk/microchip/mpfs_clk_cfg.c    |  7 +++----
>  drivers/clk/microchip/mpfs_clk_periph.c | 16 ++++------------
>  5 files changed, 20 insertions(+), 35 deletions(-)

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