[PATCH v5 0/6] clk: renesas: r8a77990, r8a774c0: Add Z2 clock

[Simon Horman]

Hi,

this series adds the Z2 clock as a clock with both a fixed and variable
divisor with a parent of PLL0 to the CPG-MSSR drivers for the R-Car E3
(r8a77990) and RZ/G2E (r8a774c0) SoCs.

In order to do so this series:

1. Parameterise Z and Z2 clock fixed divisor in shared Gen-3 CPG
   driver code to allow fixed divisors other than 2 - the E3 Z2
   clock has a fixed divisor of 4

2. Parameterise offset of Z and Z2 clock control bits -
   the offsets on E3 differ to other R-Car Gen 3 SoCs

3. Support Z and Z2 clocks with high frequency parents.
   The parent of the E3 Z2 clock, PLL0, is 4.8GHz and thus
   when expressed in HZ must be treated as a 64bit value.

4. Actually add the Z2 clocks

Changes since v4
* Separate patch to add DIV64_U64_ROUND_CLOSEST helper
* Accumulate review tags

Changes since v3
----------------
* Add and use DIV64_U64_ROUND_CLOSEST in the patch to allow
  high frequency parents. This corrects the patch for 32bit platforms.
* Accumulate review and testing tags.

Changes since v2
----------------
* Parameterise control bit offset rather than using a quirk
* Revised RZ/G2E patch - I was confused and updating the file for
  the wrong part number


Testing Overview
----------------

v4 of this patchset was tested on Ebisu-4D/E3 with top of
renesas-devel-20190207-v5.0-rc5. This allowed CPUFreq to be successfully
exercised.

v4 of the patchset was also tested for regressions Salvator-X/M3-W ES1.0.

There is no overall code-change between v4 and v5 of this patchset.

This v3 of this patchset was been independently tested RZ/G2E.
It is not expected that v5 will have any behavioural differences
on that (or any other 64bit) platform.


Patches List by Author
----------------------

Simon Horman (4):
  clk: renesas: rcar-gen3: Parameterise Z and Z2 clock offset
  math64: New DIV64_U64_ROUND_CLOSEST helper
  clk: renesas: rcar-gen3: Support Z and Z2 clocks with high frequency
    parents
  clk: renesas: r8a774c0: Add Z2 clock

Takeshi Kihara (2):
  clk: renesas: rcar-gen3: Parameterise Z and Z2 clock fixed divisor
  clk: renesas: r8a77990: Add Z2 clock

 drivers/clk/renesas/r8a774a1-cpg-mssr.c |  4 ++--
 drivers/clk/renesas/r8a774c0-cpg-mssr.c |  1 +
 drivers/clk/renesas/r8a7795-cpg-mssr.c  |  5 +++--
 drivers/clk/renesas/r8a7796-cpg-mssr.c  |  5 +++--
 drivers/clk/renesas/r8a77965-cpg-mssr.c |  2 +-
 drivers/clk/renesas/r8a77990-cpg-mssr.c |  1 +
 drivers/clk/renesas/rcar-gen3-cpg.c     | 27 +++++++++++++--------------
 drivers/clk/renesas/rcar-gen3-cpg.h     |  4 ++++
 include/linux/math64.h                  | 13 +++++++++++++
 9 files changed, 41 insertions(+), 21 deletions(-)

-- 
2.11.0