linux-kernel - Re: [PATCH 1/4] clk: sunxi-ng: a10/a20: rewrite init code to a platform driver

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Date:   Thu, 30 Apr 2020 06:21:37 +0000
From:   Priit Laes <plaes@...es.org>
To:     Maxime Ripard <maxime@...no.tech>
Cc:     Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH 1/4] clk: sunxi-ng: a10/a20: rewrite init code to a
 platform driver

On Wed, Apr 29, 2020 at 04:35:10PM +0200, Maxime Ripard wrote:
> Hi,
> 
> On Mon, Apr 20, 2020 at 08:32:28PM +0000, Priit Laes wrote:
> > On Mon, Apr 20, 2020 at 02:49:35PM +0200, Maxime Ripard wrote:
> > > On Sat, Apr 18, 2020 at 01:17:27AM +0300, Priit Laes wrote:
> > > > In order to register regmap for sun7i CCU, there needs to be
> > > > a device structure already bound to the CCU device node.
> > > > 
> > > > Convert the sun4i/sun7i CCU setup to platform driver to use
> > > > it later as platform device.
> > > > 
> > > > Signed-off-by: Priit Laes <plaes@...es.org>
> > > 
> > > You can't relly do that though. We have timers that need those clocks before the
> > > device model is initialized.
> > 
> > Ok, I'm somewhat lost now... are these the affected timers on sun7i following:
> > - allwinner,sun4i-a10-timer (timer@...0c00)
> > - allwinner,sun7i-a20-hstimer (hstimer@...0000)
> 
> Yep
> 
> > Any ideas on what approach I could actually use?
> 
> I guess you could keep the CLK_OF_DECLARE registration, and then have a
> platform_driver probe and register the regmap?
> 

Thanks this did the trick.

> > Also, similar timer dependency would affect then sun6i-a31 and sun9i-a80
> > platforms too...

I didn't check this before, but sun9i-a80 CCU is initialized currently via
platform device. Should it be converted first to clock driver (CLK_OF_DECLARE)?

I have sent out the v2 which contains sun7i/sun6i changes.

> 
> Indeed.
> 
> Maxime