linux-kernel - Re: [PATCH v3 3/4] clk: sunxi-ng: Convert early providers to platform drivers

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Date:   Wed, 28 Jun 2023 09:44:18 +0200
From:   Maxime Ripard <mripard@...nel.org>
To:     Måns Rullgård <mans@...sr.com>
Cc:     Samuel Holland <samuel@...lland.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        linux-sunxi@...ts.linux.dev,
        Michael Turquette <mturquette@...libre.com>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/4] clk: sunxi-ng: Convert early providers to
 platform drivers

On Mon, Jun 26, 2023 at 01:21:33PM +0100, Måns Rullgård wrote:
> Samuel Holland <samuel@...lland.org> writes:
> 
> > The PRCM CCU drivers depend on clocks provided by other CCU drivers. For
> > example, the sun8i-r-ccu driver uses the "pll-periph" clock provided by
> > the SoC's main CCU.
> >
> > However, sun8i-r-ccu is an early OF clock provider, and many of the
> > main CCUs (e.g. sun50i-a64-ccu) use platform drivers. This means that
> > the consumer clocks will be orphaned until the supplier driver is bound.
> > This can be avoided by converting the remaining CCUs to use platform
> > drivers. Then fw_devlink will ensure the drivers are bound in the
> > optimal order.
> >
> > The sun5i CCU is the only one which actually needs to be an early clock
> > provider, because it provides the clock for the system timer. That one
> > is left alone.
> >
> > Signed-off-by: Samuel Holland <samuel@...lland.org>
> > ---
> >
> > (no changes since v1)
> >
> >  drivers/clk/sunxi-ng/Kconfig             | 20 ++++----
> >  drivers/clk/sunxi-ng/ccu-sun4i-a10.c     | 58 +++++++++++++--------
> >  drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c   | 56 ++++++++++++--------
> >  drivers/clk/sunxi-ng/ccu-sun50i-h616.c   | 33 ++++++++----
> >  drivers/clk/sunxi-ng/ccu-sun6i-a31.c     | 40 +++++++++++----
> >  drivers/clk/sunxi-ng/ccu-sun8i-a23.c     | 35 +++++++++----
> >  drivers/clk/sunxi-ng/ccu-sun8i-a33.c     | 40 +++++++++++----
> >  drivers/clk/sunxi-ng/ccu-sun8i-h3.c      | 62 ++++++++++++++--------
> >  drivers/clk/sunxi-ng/ccu-sun8i-r.c       | 65 ++++++++++++++----------
> >  drivers/clk/sunxi-ng/ccu-sun8i-v3s.c     | 57 +++++++++++++--------
> >  drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c | 38 ++++++++++----
> >  11 files changed, 332 insertions(+), 172 deletions(-)
> 
> This broke the hstimer clocksource on A20 since it requires a clock
> provided by the sun4i ccu driver.

The A10 is probably broken by this, but the A20 should be able to use
the arch timers just like all the other Cortex-A7-based SoCs.

Do you have a dmesg log that could help debug why it's not working?

Maxime

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