[PATCH v2 0/8] clk: renesas: rcar-gen2/gen3: Switch to .determine_rate()

[Geert Uytterhoeven <geert+renesas@glider.be>]

	Hi Mike, Stephen,

As the .round_rate() callback returns a long clock rate, it cannot
return clock rates that do not fit in signed long, but do fit in
unsigned long.  The newer .determine_rate() callback does not suffer
from this limitation.  In addition, .determine_rate() provides the
ability to specify a rate range.

This patch series performs the customary preparatory cleanups, and
switches the Z (CPU) and SD clocks in the R-Car Gen2 and Gen3 clock
drivers from the .round_rate() to the .determine_rate() callback.
Note that the "div6" clock driver hasn't been converted yet, so div6
clocks still use .round_rate().

Changes compared to v1[1]:
  - Add preparatory arithmetic division improvements
  - Split off cpg_sd_clock_calc_div() absorption and SD clock best rate
    calculation,
  - Use div_u64() for division by unsigned long,

This has been tested on R-Car M2-W and various R-Car Gen3, and should
have no behavioral impact.

To be queued in clk-renesas-for-v5.5.

Thanks for your comments!

[1] [PATCH 0/5] clk: renesas: rcar-gen2/gen3: Switch to .determine_rate()
    https://lore.kernel.org/linux-clk/20190617125238.13761-1-geert+renesas@glider.be/

Geert Uytterhoeven (8):
  clk: renesas: rcar-gen2: Improve arithmetic divisions
  clk: renesas: rcar-gen3: Improve arithmetic divisions
  clk: renesas: rcar-gen3: Avoid double table iteration in SD
    .set_rate()
  clk: renesas: rcar-gen3: Absorb cpg_sd_clock_calc_div()
  clk: renesas: rcar-gen3: Loop to find best rate in
    cpg_sd_clock_round_rate()
  clk: renesas: rcar-gen2: Switch Z clock to .determine_rate()
  clk: renesas: rcar-gen3: Switch Z clocks to .determine_rate()
  clk: renesas: rcar-gen3: Switch SD clocks to .determine_rate()

 drivers/clk/renesas/rcar-gen2-cpg.c | 25 ++++++-----
 drivers/clk/renesas/rcar-gen3-cpg.c | 64 ++++++++++++++++-------------
 2 files changed, 49 insertions(+), 40 deletions(-)

-- 
2.17.1

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds