[PATCH v3 2/4] spi: s3c64xx: support custom value of internal clock divider

[Chanho Park]

> > Modern exynos SoCs such as Exynos Auto v9 have different internal
> > clock divider, for example "4". To support this internal value, this
> > adds clk_div of the s3c64xx_spi_port_config and assign "2" as the
> > default value to existing s3c64xx_spi_port_config.
> >
> > Signed-off-by: Chanho Park <chanho61.park at samsung.com>
> 
> While this gives a way to set up the default clock divider (which is
> fair) I think
> you should probably go the extra mile and make this clock divider a proper
> clock abstraction, so the driver can respect the DT standard property spi-
> max-frequency from Documentation/devicetree/bindings/spi/spi-peripheral-
> props.yaml
> 
> This actually isn't very hard: look for example in the PL111 driver, a
> hardware block that contains a similar internal clock divider:
> drivers/gpu/drm/pl111/pl111_display.c
> check how we define a clock from pl111_clk_div_ops.
> in pl111_init_clock_divider().
> 
> Then the driver probe() just grabs that clock and sets the frequency.
> The algorithms should be pretty much copy/paste.

Thanks for the suggestion. I'll look into it.

Best Regards,
Chanho Park