[V8,0/4] Add APSS clock controller support for IPQ6018

The CPU on Qualcomm's IPQ6018 devices are primarily fed by APSS PLL and XO,
these are connected to a clock mux and enable block.

This patch series adds support for these clocks and inturn enables clocks
required for CPU freq.

[V8]
 * In patch 1 changed compatible string from const to enum
 * Since this change is minimal retained Review tag from Rob
 * In patch 3 re added Ack from Rob
[V7]
 * Removed dts patch from this series, will send that separately
 * Addressed Rob's minor comment on the binding
 * Patch 1 depends on a53 pll bindings
   https://lkml.org/lkml/2020/5/4/60
[V6]
 * Split mailbox driver from this series, mailbox changes will sent as a
   separate series
 * Addressed review comments from Stephen
[V5]
 * Addressed Bjorn comments on apss clk and dt-bindings
 * Patch 2 depends on a53 pll dt-bindings
   https://www.spinics.net/lists/linux-clk/msg48358.html  
[V4]
 * Re-written PLL found on IPQ platforms as a separate driver
 * Addressed stephen's comments on apss clock controller and pll
 * Addressed Rob's review comments on bindings
 * moved a53 pll binding from this series as it is not applicable, will send
   it separately.
[V3]
 * Fixed dt binding check error in patch2
   dt-bindings: clock: Add YAML schemas for QCOM A53 PLL
[V2]
 * Restructred the patch series as there are two different HW blocks,
   the mux and enable belongs to the apcs block and PLL has a separate HW
   block.
 * Converted qcom mailbox and qcom a53 pll documentation to yaml.
 * Addressed review comments from Stephen, Rob and Sibi where it is applicable.
 * Changed this cover letter to state the purpose of this patch series

Sivaprakash Murugesan (4):
  dt-bindings: clock: add ipq6018 a53 pll compatible
  clk: qcom: Add ipq apss pll driver
  clk: qcom: Add DT bindings for ipq6018 apss clock controller
  clk: qcom: Add ipq6018 apss clock controller

 .../devicetree/bindings/clock/qcom,a53pll.yaml     |  18 ++++
 drivers/clk/qcom/Kconfig                           |  19 ++++
 drivers/clk/qcom/Makefile                          |   2 +
 drivers/clk/qcom/apss-ipq-pll.c                    |  95 ++++++++++++++++++
 drivers/clk/qcom/apss-ipq6018.c                    | 106 +++++++++++++++++++++
 include/dt-bindings/clock/qcom,apss-ipq.h          |  12 +++
 6 files changed, 252 insertions(+)
 create mode 100644 drivers/clk/qcom/apss-ipq-pll.c
 create mode 100644 drivers/clk/qcom/apss-ipq6018.c
 create mode 100644 include/dt-bindings/clock/qcom,apss-ipq.h