The following patchset enables CPU frequency scaling support on the
QCS404.

Patch 8 "clk: qcom: hfpll: CLK_IGNORE_UNUSED" is a bit controversial;
in this platform, this PLL provides the clock signal to a CPU
core. But in others it might not.

I opted for the minimal ammount of changes without affecting the
default functionality: simply bypassing the COMMON_CLK_DISABLE_UNUSED
framework and letting the firwmare chose whether to enable or disable
the clock at boot. However maybe a DT property and marking the clock
as critical would be more appropriate for this PLL. I'd appreciate the
maintainer's input on this topic.

v2:
   - dts: ms8916: apcs mux/divider: new bindings
     (the driver can still support the old bindings)
     
   - qcs404.dtsi
     fix apcs-hfpll definition
     fix cpu_opp_table definition
     
   - GPLL0_AO_OUT operating frequency
     define new alpha_pll_fixed_ops to limit the operating frequency
   
Co-developed-by: Niklas Cassel <redacted>
Signed-off-by: Niklas Cassel <redacted>
Signed-off-by: Jorge Ramirez-Ortiz <redacted>

Jorge Ramirez-Ortiz (14):
  clk: qcom: gcc: limit GPLL0_AO_OUT operating frequency
  mbox: qcom: add APCS child device for QCS404
  mbox: qcom: replace integer with valid macro
  dt-bindings: mailbox: qcom: Add clock-name optional property
  clk: qcom: apcs-msm8916: get parent clock names from DT
  clk: qcom: hfpll: get parent clock names from DT
  clk: qcom: hfpll: register as clock provider
  clk: qcom: hfpll: CLK_IGNORE_UNUSED
  arm64: dts: qcom: msm8916: Add the clocks for the APCS mux/divider
  arm64: dts: qcom: qcs404: Add OPP table
  arm64: dts: qcom: qcs404: Add HFPLL node
  arm64: dts: qcom: qcs404: Add the clocks for APCS mux/divider
  arm64: dts: qcom: qcs404: Add cpufreq support
  arm64: defconfig: Enable HFPLL

 .../bindings/mailbox/qcom,apcs-kpss-global.txt     | 24 +++++++++++++--
 arch/arm64/boot/dts/qcom/msm8916.dtsi              |  3 +-
 arch/arm64/boot/dts/qcom/qcs404.dtsi               | 35 ++++++++++++++++++++++
 arch/arm64/configs/defconfig                       |  1 +
 drivers/clk/qcom/apcs-msm8916.c                    | 32 +++++++++++++++-----
 drivers/clk/qcom/clk-alpha-pll.c                   |  8 +++++
 drivers/clk/qcom/clk-alpha-pll.h                   |  1 +
 drivers/clk/qcom/gcc-qcs404.c                      |  3 +-
 drivers/clk/qcom/hfpll.c                           | 19 +++++++++++-
 drivers/mailbox/qcom-apcs-ipc-mailbox.c            | 21 ++++++++-----
 10 files changed, 125 insertions(+), 22 deletions(-)

-- 
2.7.4