linux-kernel - Re: [PATCH v3 1/7] dt/bindings: Add binding for the Raspberry Pi clock provider

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Date:	Fri, 24 Jul 2015 16:30:08 +0100
From:	Lee Jones <lee@...nel.org>
To:	Eric Anholt <eric@...olt.net>
Cc:	linux-arm-kernel@...ts.infradead.org,
	linux-rpi-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Stephen Warren <swarren@...dotorg.org>,
	linux-clk@...r.kernel.org, Stephen Boyd <sboyd@...eaurora.org>,
	Mike Turquette <mturquette@...aro.org>
Subject: Re: [PATCH v3 1/7] dt/bindings: Add binding for the Raspberry Pi
 clock provider

On Tue, 07 Jul 2015, Eric Anholt wrote:

> Lee Jones <lee@...nel.org> writes:
> 
> > If I were the Clock Maintainer, I would have probably missed this
> > patch.  You _must_ intimate which subsystem you are submitting to.
> >
> >> The hardware clocks are not controllable by the ARM, so we have to
> >> make requests to the firmware to do so from the VPU side.  This will
> >> let us replace fixed clocks in our DT with actual clock control (and
> >> correct frequency information).
> >> 
> >> v2: Include the dt-bindings header in this commit instead of the next
> >>     one.  Make the clock indices match the firmware clock IDs.  Rename
> >>     the binding's compat string.  Move the firmware phandle to be
> >>     under a vendor-specific namespace.
> >> 
> >> Signed-off-by: Eric Anholt <eric@...olt.net>
> >> ---
> >>  .../clock/raspberrypi,bcm2835-firmware-clocks.txt  | 25 ++++++++++++++++++++++
> >>  include/dt-bindings/clk/raspberrypi.h              | 23 ++++++++++++++++++++
> >>  2 files changed, 48 insertions(+)
> >>  create mode 100644 Documentation/devicetree/bindings/clock/raspberrypi,bcm2835-firmware-clocks.txt
> >>  create mode 100644 include/dt-bindings/clk/raspberrypi.h
> >> 
> >> diff --git a/Documentation/devicetree/bindings/clock/raspberrypi,bcm2835-firmware-clocks.txt b/Documentation/devicetree/bindings/clock/raspberrypi,bcm2835-firmware-clocks.txt
> >> new file mode 100644
> >> index 0000000..0972602
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/clock/raspberrypi,bcm2835-firmware-clocks.txt
> >> @@ -0,0 +1,25 @@
> >> +Raspberry Pi firmware clock provider.
> >> +
> >> +The Raspberry Pi architecture doesn't provide direct access to the
> >> +CLOCKMAN peripheral from the ARM side, so Linux has to make requests
> >> +to the VPU firmware to program them.
> >> +
> >> +This binding uses the common clock binding:
> >> +Documentation/devicetree/bindings/clock/clock-bindings.txt
> >> +
> >> +Required properties:
> >> +- compatible:		Should be "raspberrypi,bcm2835-firmware-clocks"
> >> +
> >> +- #clock-cells:		Shall have value <1>.  The permitted clock-specifier
> >> +			  values can be found in
> >> +			  include/dt-bindings/clk/raspberrypi.h.
> >> +
> >> +- raspberrypi,firmware:	Phandle to the firmware driver node.
> >
> > I think 'firmware' is a candidate for a generic phandle name.
> 
> Stephen Warren asked in the last version that I change it from
> "firmware" to "raspberrypi,firmware", which made sense to me since we're
> not some core infrastructure using these references.  Which should it
> be?

We tend to use vendor specific bindings when others are unlikely to
make use of them.  I would have thought that different vendors would
also make use of a generic 'firmware' phandle.  The final decision
would probably be taken by the DT guys.
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