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

Jean-Francois Moine
2016-08-01T08:30:24Z

On Mon, 1 Aug 2016 02:43:06 +0100
Andr=E9 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.
>=20
> Let me know what you think!

Hi Andr=E9,

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.

--=20
Ken ar c'henta=F1 | ** Breizh ha Linux atav! **
Jef | http://moinejf.free.fr/