Re: [PATCH v7 0/6] Add common clock support for Broadcom iProc architecture

[Ray Jui]

Hi Mike,

Have you had a chance to review the iProc clock patches? If possible,
I'd like to get feedback from you as early as possible so I can make
changes if required. It would be really nice if we can get the iProc
clock patches going into v4.2.

A lot of our iProc drivers depend on these clock patches.

Thanks,

Ray

On 5/5/2015 11:13 AM, Ray Jui wrote:
> This patchset contains the initial common clock support for Broadcom's iProc
> family of SoCs. The iProc clock architecture comprises of various PLLs, e.g.,
> ARMPLL, GENPLL, LCPLL0, MIPIPLL, and etc. An onboard crystal serves as the
> basic reference clock for these PLLs. Each PLL may have several leaf clocks.
> One special group of clocks is the ASIU clocks, which are dervied directly
> from the crystal reference clock.
> 
> This patchset also contains the basic clock support for the Broadcom Cygnus
> SoC, which implements the iProc clock architecture
> 
> Changes from v6:
>  - Rebase to v4.1-rc2
>  - Consolidate iProc PLL and its leaf clocks into a single device node, based
>    on feedback from Mike Turquette. The PLL and its leaf clocks are now exposed
>    a clock consumer through indices of the same device node phandle
>  - Update iProc device tree binding document based on the above change
>  - Add SW override support to iProc PLL clocks
> 
> Changes from v5:
>  - Rebase to v4.0-rc4
>  - Drop of_clk_get_parent_rate helper function from the clock framework
>  - Get rid of custom "clock-frequency" support in iProc PLL code. Instead, add
>    standard clock set_rate and round_rate support and make use of DT properties
>    "assigned-clocks" and "assigned-clock-rates" to initialize PLL to the
>    desired rate when registering to the clock framework
>  - Add SW workaround for ASIC bug on MIPI PLL to always read back the same
>    register following a write transaction, to ensure value is written to the
>    correct register
> 
> Changes from v4:
>  - Add of_clk_get_parent_rate helper function into the clock framework
>  - Switch to use of_clk_get_parent_rate in the iProc PLL clock driver
> 
> Changes from v3:
>  - Fix incorrect use of passing in of_clk_src_onecell_get when adding ARM PLL
>    and other iProc PLLs as clock provider. These PLLs have zero cells in DT and
>    thefore of_clk_src_simple_get should be used instead
>  - Rename Cygnus MIPI PLL Channel 2 clock from BCM_CYGNUS_MIPIPLL_CH2_UNUSED
>    to BCM_CYGNUS_MIPIPLL_CH2_V3D, since a 3D graphic rendering engine has been
>    integrated into Cygnus revision B0 and has its core clock running off
>    MIPI PLL Channel 2
>  - Changed default MIPI PLL VCO frequency from 1.75 GHz to 2.1 GHz. This allows
>    us to derive 300 MHz V3D clock from channel 2 through the post divisor
> 
> Changes from v2:
>  - Re-arrange Cygnus clock/pll init functions so each init function is right
>    next to its clock table
>  - Removed #defines for number of clocks in Cygnus. Have the number of clocks
>    automatically determined based on array size of the clock table
> 
> Changes from v1:
>  - Separate drivers/clk/Makefile change for drivers/clk/bcm out to a standalone patch
> 
> Ray Jui (6):
>   clk: iproc: define Broadcom iProc clock binding
>   clk: iproc: add initial common clock support
>   clk: Change bcm clocks build dependency
>   clk: cygnus: add clock support for Broadcom Cygnus
>   ARM: dts: enable clock support for Broadcom Cygnus
>   clk: cygnus: remove Cygnus dummy clock binding
> 
>  .../devicetree/bindings/clock/bcm-cygnus-clock.txt |   34 -
>  .../bindings/clock/brcm,iproc-clocks.txt           |  132 ++++
>  arch/arm/boot/dts/bcm-cygnus-clock.dtsi            |   89 ++-
>  drivers/clk/Makefile                               |    2 +-
>  drivers/clk/bcm/Kconfig                            |    9 +
>  drivers/clk/bcm/Makefile                           |    2 +
>  drivers/clk/bcm/clk-cygnus.c                       |  265 ++++++++
>  drivers/clk/bcm/clk-iproc-armpll.c                 |  282 ++++++++
>  drivers/clk/bcm/clk-iproc-asiu.c                   |  276 ++++++++
>  drivers/clk/bcm/clk-iproc-pll.c                    |  716 ++++++++++++++++++++
>  drivers/clk/bcm/clk-iproc.h                        |  178 +++++
>  include/dt-bindings/clock/bcm-cygnus.h             |   68 ++
>  12 files changed, 1990 insertions(+), 63 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/clock/bcm-cygnus-clock.txt
>  create mode 100644 Documentation/devicetree/bindings/clock/brcm,iproc-clocks.txt
>  create mode 100644 drivers/clk/bcm/clk-cygnus.c
>  create mode 100644 drivers/clk/bcm/clk-iproc-armpll.c
>  create mode 100644 drivers/clk/bcm/clk-iproc-asiu.c
>  create mode 100644 drivers/clk/bcm/clk-iproc-pll.c
>  create mode 100644 drivers/clk/bcm/clk-iproc.h
>  create mode 100644 include/dt-bindings/clock/bcm-cygnus.h
> 
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