Re: [PATCH v4 4/5] soc: qcom: Add device tree binding for GLINK RPM

From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Rob Herring <robh@kernel.org>
Cc: Andy Gross <andy.gross@linaro.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Ohad Ben-Cohen <ohad@wizery.com>,
	Jassi Brar <jassisinghbrar@gmail.com>,
	linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-remoteproc@vger.kernel.org
Subject: Re: [PATCH v4 4/5] soc: qcom: Add device tree binding for GLINK RPM
Date: Mon, 8 May 2017 10:53:51 -0700	[thread overview]
Message-ID: <20170508175351.GL15143@minitux> (raw)
In-Reply-To: <20170508170606.uchxrihfodk6yts5@rob-hp-laptop>

On Mon 08 May 10:06 PDT 2017, Rob Herring wrote:

> On Thu, May 04, 2017 at 01:05:38PM -0700, Bjorn Andersson wrote:
> > Add device tree binding documentation for the Qualcomm GLINK RPM, used
> > for communication with the Resource Power Management subsystem in
> > various Qualcomm SoCs.
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> > ---
> > 
> > Changes since v3:
> > - Transition doorbell to mailbox framework
> > 
> > Changes since v2:
> > - Replace qcom,ipc syscon with a "doorbell"
> > 
> > Changes since v1:
> > - None
> > 
> >  .../devicetree/bindings/soc/qcom/qcom,glink.txt    | 73 ++++++++++++++++++++++
> >  1 file changed, 73 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt
> > new file mode 100644
> > index 000000000000..e32198df0e9c
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,glink.txt
> > @@ -0,0 +1,73 @@
> > +Qualcomm RPM GLINK binding
> > +
> > +This binding describes the Qualcomm RPM GLINK, a fifo based mechanism for
> > +communication with the Resource Power Management system on various Qualcomm
> > +platforms.
> > +
> > +- compatible:
> > +	Usage: required
> > +	Value type: <stringlist>
> > +	Definition: must be "qcom,glink-rpm"
> > +
> > +- interrupts:
> > +	Usage: required
> > +	Value type: <prop-encoded-array>
> > +	Definition: should specify the IRQ used by the remote processor to
> > +		    signal this processor about communication related events
> > +
> > +- qcom,rpm-msg-ram:
> > +	Usage: required
> > +	Value type: <prop-encoded-array>
> > +	Definition: handle to RPM message memory resource
> > +
> > +- mboxes:
> > +	Usage: required
> > +	Value type: <prop-encoded-array>
> > +	Definition: reference to the "rpm_hlos" mailbox in APCS, as described
> > +		    in mailbox/mailbox.txt
> > +
> > += GLINK DEVICES
> > +Each subnode of the GLINK node represent function tied to a virtual
> > +communication channel. The name of the nodes are not important. The properties
> > +of these nodes are defined by the individual bindings for the specific function
> > +- but must contain the following property:
> > +
> > +- qcom,glink-channels:
> > +	Usage: required
> > +	Value type: <stringlist>
> > +	Definition: a list of channels tied to this function, used for matching
> > +		    the function to a set of virtual channels
> > +
> > += EXAMPLE
> > +The following example represents the GLINK RPM node on a MSM8996 device, with
> > +the function for the "rpm_request" channel defined, which is used for
> > +regualtors and root clocks.
> > +
> > +	apcs_glb: apcs-glb@9820000 {
> 
> mailbox@... Or does this block do other things?
> 

So far it's just a mailbox, so I'll update this.

> Otherwise,
> 
> Acked-by: Rob Herring <robh@kernel.org>
> 

Thanks,
Bjorn