linux-kernel - Re: [PATCH 22/89] clk: bcm: rpi: Discover the firmware clocks

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Date:   Wed, 26 Feb 2020 15:15:09 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Eric Anholt <eric@...olt.net>, dri-devel@...ts.freedesktop.org,
        linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        Tim Gover <tim.gover@...pberrypi.com>,
        Phil Elwell <phil@...pberrypi.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-clk@...r.kernel.org
Subject: Re: [PATCH 22/89] clk: bcm: rpi: Discover the firmware clocks

Hi Florian,

On Mon, Feb 24, 2020 at 10:15:32AM -0800, Florian Fainelli wrote:
> On 2/24/20 1:06 AM, Maxime Ripard wrote:
> > The firmware has an interface to discover the clocks it exposes.
> >
> > Let's use it to discover, register the clocks in the clocks framework and
> > then expose them through the device tree for consumers to use them.
> >
> > Cc: Michael Turquette <mturquette@...libre.com>
> > Cc: Stephen Boyd <sboyd@...nel.org>
> > Cc: linux-clk@...r.kernel.org
> > Signed-off-by: Maxime Ripard <maxime@...no.tech>
>
> That seems like a re-implementaiton of SCMI without all of its
> protocols, without being able to use the existing drivers, maybe a
> firmware update should be considered so standard drivers can be leveraged?

I'm not really qualified to talk about how the firmware will evolve in
the future, but you're right that it looks a lot like what SCMI can
do.

Even if a firmware update was to support SCMI at some point, since the
firmware is flashed in an EEPROM, we'd still have to support that
interface.

Maxime

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