lkml.org 
[lkml]   [2016]   [Aug]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Subject[PATCH v4 0/7] arm64: Allwinner A64 support
    Date
    This is a new attempt on proper upstream Allwinner A64 support. It
    builds on the bits that have already been merged (arm64 architecture
    support and the pinctrl driver), and mostly completes it with some
    DT files.

    I chose a new approach on the clock system:
    - For the basic PLL clocks we go with fixed-clocks now, as Allwinner
    recommends fixed frequencies for those anyway. I am not sure whether
    we should express the dependencies between those clocks as fixed-factor
    clocks or not.
    - The clock gates are left as in the previous post, so using a flexible,
    DT driver based on the existing simple-gates.c. There are ways to get
    away without it, but those approaches are more hideous and I still
    consider this approach pretty clean.
    - Any other clock is expected to be handled by firmware using the
    SCPI protocol (which ARM's Juno board uses as well). While this is not
    the most flexible and all-encompassing interface, it fits the bill for
    our clocks for now and enjoys upstream support on the Linux side already,
    so there are no patches needed on this front.
    I will send RFC patches demonstrating this just after this series.

    This series focusses on the basic peripherals. The MMC support, which was
    part of former revisions of this series, is dropped for now as the
    current driver lacks some bits to properly support the enhanced A64 MMC
    controller, which becomes evident when trying to use it on an eMMC device.
    There are patches floating around to tackle this, but this workd shouldn't
    delay upstreaming the basic bits first.

    This series has been tested (with an initrd) on the Pine64 and
    BananaPi M64 boards.

    As Maxime's latest post uses a completely different clock system, I
    wanted to put this forward as a simpler and more sustainable approach
    to tackle the tricky Allwinner CCU subsystem. I am happy to collaborate
    and to find the right way (TM) to support this (and future!) SoCs.

    Any comments are welcome!

    Cheers,
    Andre.

    Changelog v3..v4:
    - add proper Kconfig bits to build the pinctrl driver
    - adapt Maxime's approach of avoiding pine64-common.dtsi
    - add PMU DT node
    - use fixed-clocks for basic PLL clocks
    - use clock names based on manual (periph0 & friends)
    - move clocks out of their own subnode into a separate file
    - add .dts for BananaPi-M64 (thanks to Nora Lee for a sample board)


    Andre Przywara (7):
    arm64: sunxi: Kconfig: add essential pinctrl driver
    DT: clk: sunxi: add binding doc for the multi-bus-gates clock
    clk: sunxi: add generic multi-parent bus clock gates driver
    of: add vendor prefix for Pine64
    arm64: dts: add Allwinner A64 SoC .dtsi
    arm64: dts: add Pine64 support
    arm64: dts: add BananaPi M64 support

    Documentation/devicetree/bindings/arm/sunxi.txt | 1 +
    Documentation/devicetree/bindings/clock/sunxi.txt | 7 +
    .../devicetree/bindings/vendor-prefixes.txt | 1 +
    arch/arm64/Kconfig.platforms | 2 +
    arch/arm64/boot/dts/Makefile | 1 +
    arch/arm64/boot/dts/allwinner/Makefile | 6 +
    .../boot/dts/allwinner/sun50i-a64-bananapi-m64.dts | 74 ++++
    .../boot/dts/allwinner/sun50i-a64-clocks.dtsi | 140 ++++++++
    .../boot/dts/allwinner/sun50i-a64-pine64-plus.dts | 48 +++
    .../arm64/boot/dts/allwinner/sun50i-a64-pine64.dts | 74 ++++
    arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 398 +++++++++++++++++++++
    drivers/clk/sunxi/Makefile | 1 +
    drivers/clk/sunxi/clk-multi-gates.c | 105 ++++++
    13 files changed, 858 insertions(+)
    create mode 100644 arch/arm64/boot/dts/allwinner/Makefile
    create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-a64-bananapi-m64.dts
    create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-a64-clocks.dtsi
    create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-a64-pine64-plus.dts
    create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-a64-pine64.dts
    create mode 100644 arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
    create mode 100644 drivers/clk/sunxi/clk-multi-gates.c

    --
    2.9.0

    \
     
     \ /
      Last update: 2016-08-08 20:01    [W:2.317 / U:0.200 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site