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

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Date:	Sun, 31 Jul 2016 10:51:40 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Jean-Francois Moine <moinejf@...e.fr>
Cc:	Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	Mike Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	devicetree@...r.kernel.org,
	Andre Przywara <andre.przywara@....com>,
	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng

On Fri, Jul 29, 2016 at 07:48:00AM +0200, Jean-Francois Moine wrote:
> On Thu, 28 Jul 2016 22:07:05 +0200
> Maxime Ripard <maxime.ripard@...e-electrons.com> wrote:
> 
> > > > Let me know what you think,
> > > 
> > > I don't see the interest to have common code for 32bits and 64bits.
> > > The clock driver of a SoC will never evolve, so, it is simpler to
> > > copy the source common with the H3 into a clean A64 clock driver.
> > 
> > I'm not sure why 32 bits vs 64 bits matters here. We're going to share
> > a significant number of drivers already between armv7 and armv8, like
> > MMC, EMAC, I2C, and so on.
> > 
> > And I expect to share the data in other SoCs for the A10, A13 and A20
> > for example, or A23/A33, which have a lot of clocks in common too.
> 
> The interest of your sunxi-ng approach is that the clocks of each SoC
> is described in one file. Here you are mixing 2 SoCs in the same source
> file. The advantage is lost.

Because (and only because) the huge majority of those clocks are
shared between these SoCs.

If it differs in a significant way (like for the A31 that is currently
submitted), there's of course no reason to merge it in the same file.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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