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Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng

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On Mon, 1 Aug 2016 02:43:06 +0100
André Przywara <andre.przywara@arm.com> wrote:

> As this became quite a long read, here a TL;DR:
> - We consider using an SCPI based clock system for the A64, alongside
> allwinner,simple-gates and fixed clocks. We try to avoid any Allwinner
> specific clocks (apart from the simple-gates).
> - ARM Trusted Firmware provides the SCPI implementation - for now, later
> we may move this into a possible arisc firmware.
> - We upstream some basic DT first, possibly omitting any controversial
> clock parts at all.
> 
> Let me know what you think!

Hi André,

This looks interesting.
As I understand, the clock enable/rate setting functions would be in
the arisc. The arisc firmware would be loaded only once in the Soc and
would contain the code for handling this specific SoC.
From my calculations, this would save about 1Mb of clock descriptions
in the kernel for a universal Allwinner kernel.

But I don't see why you are keeping the simple-gates. The bus gate may
be ungated/gated when the clock is enabled/disabled, and that's what
Allwinner's software does.

-- 
Ken ar c'hentañ	|	      ** Breizh ha Linux atav! **
Jef		|		http://moinejf.free.fr/

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[PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng Maxime Ripard <maxime.ripard@free-electrons.com> - 2016-07-26 22:40 +0200
  [PATCH 12/13] arm64: dts: add Allwinner A64 SoC .dtsi Maxime Ripard <maxime.ripard@free-electrons.com> - 2016-07-26 22:40 +0200
  [PATCH 03/13] clk: sunxi-ng: sun8i: Rename DDR and video plls Maxime Ripard <maxime.ripard@free-electrons.com> - 2016-07-26 22:40 +0200
  [PATCH 09/13] arm64: sunxi: Kconfig: add essential pinctrl driver Maxime Ripard <maxime.ripard@free-electrons.com> - 2016-07-26 22:40 +0200
  [PATCH 13/13] arm64: dts: add Pine64 support Maxime Ripard <maxime.ripard@free-electrons.com> - 2016-07-26 22:40 +0200
  [PATCH 02/13] clk: sunxi-ng: mux: Add mux table support Maxime Ripard <maxime.ripard@free-electrons.com> - 2016-07-26 22:40 +0200
  [PATCH 08/13] clk: sunxi-ng: Add A64 clocks Maxime Ripard <maxime.ripard@free-electrons.com> - 2016-07-26 22:40 +0200
    Re: [PATCH 08/13] clk: sunxi-ng: Add A64 clocks Rob Herring <robh@kernel.org> - 2016-07-29 23:20 +0200
  [PATCH 10/13] arm64: Kconfig: sunxi: add PINCTRL Maxime Ripard <maxime.ripard@free-electrons.com> - 2016-07-26 22:40 +0200
  Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng Jean-Francois Moine <moinejf@free.fr> - 2016-07-27 10:50 +0200
    Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng Maxime Ripard <maxime.ripard@free-electrons.com> - 2016-07-28 22:10 +0200
      Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng Jean-Francois Moine <moinejf@free.fr> - 2016-07-29 07:50 +0200
        Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng Maxime Ripard <maxime.ripard@free-electrons.com> - 2016-07-31 22:30 +0200
  Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng André Przywara <andre.przywara@arm.com> - 2016-08-01 03:50 +0200
    Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng Jean-Francois Moine <moinejf@free.fr> - 2016-08-01 10:40 +0200
      Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng Chen-Yu Tsai <wens@csie.org> - 2016-08-01 11:20 +0200
        Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng Jean-Francois Moine <moinejf@free.fr> - 2016-08-01 14:10 +0200
          Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng Chen-Yu Tsai <wens@csie.org> - 2016-08-01 14:10 +0200
            Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng Jean-Francois Moine <moinejf@free.fr> - 2016-08-01 14:20 +0200
      Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng Andre Przywara <andre.przywara@arm.com> - 2016-08-01 12:50 +0200
    Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng Chen-Yu Tsai <wens@csie.org> - 2016-08-01 11:20 +0200

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