RE: [PATCH V8 1/4] dt-bindings: fsl: scu: add thermal binding

[Anson Huang <anson.huang@nxp.com>]

Best Regards!
Anson Huang

> -----Original Message-----
> From: Aisheng Dong
> Sent: 2019年2月26日 20:01
> To: Anson Huang <anson.huang@nxp.com>; Eduardo Valentin
> <edubezval@gmail.com>
> Cc: robh+dt@kernel.org; mark.rutland@arm.com; shawnguo@kernel.org;
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> pm@vger.kernel.org; dl-linux-imx <linux-imx@nxp.com>
> Subject: RE: [PATCH V8 1/4] dt-bindings: fsl: scu: add thermal binding
> 
> [...]
> > > On Thu, Feb 21, 2019 at 06:38:30AM +0000, Anson Huang wrote:
> > > > NXP i.MX8QXP is an ARMv8 SoC with a Cortex-M4 core inside as
> > > > system controller, the system controller is in charge of system
> > > > power, clock and thermal sensors etc. management, Linux kernel has
> > > > to communicate with system controller via MU (message unit) IPC to
> > > > get temperature from thermal sensors, this patch adds binding doc
> > > > for i.MX system controller thermal driver.
> > > >
> > > > Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> > > > Reviewed-by: Rob Herring <robh@kernel.org>
> 
> You need drop the former Reviewed-by once there's significant changes.
> 
> > > > +Thermal bindings based on SCU Message Protocol
> > > > +------------------------------------------------------------
> > > > +
> > > > +Required properties:
> > > > +- compatible:			Should be :
> > > > +				  "fsl,imx8qxp-sc-thermal"
> > > > +				followed by "fsl,imx-sc-thermal";
> > > > +
> > > > +- #thermal-sensor-cells:	See
> > > Documentation/devicetree/bindings/thermal/thermal.txt
> > > > +				for a description.
> > > > +
> > > > +- imx,sensor-resource-id: 	Property array to specify each
> thermal
> > zone's
> > > sensor resource ID.
> > >
> > > If this is an array...
> > >
> > > > +
> > > >  Example (imx8qxp):
> > > >  -------------
> > > >  lsio_mu1: mailbox@5d1c0000 {
> > > > @@ -168,6 +181,12 @@ firmware {
> > > >  		rtc: rtc {
> > > >  			compatible = "fsl,imx8qxp-sc-rtc";
> > > >  		};
> > > > +
> > > > +		tsens: thermal-sensor {
> > > > +			compatible = "fsl,imx8qxp-sc-thermal", "fsl,imx-sc-
> > > thermal";
> > > > +			#thermal-sensor-cells = <0>;
> > > > +			imx,sensor-resource-id = <IMX_SC_R_SYSTEM>;
> > >
> > > then this example should have an array, to be better express how
> > > this is supposed to work. Can you please resend this with an array
> instead?
> >
> > On i.MX8QXP, there is ONLY 1 thermal zone available currently, but the
> > thermal driver is supposed to support multi thermal zones as well for
> > i.MX8QM, in V9 patch set I just sent, I use the "
> > imx,sensor-resource-id " element count to determine how many thermal
> > sensors will be supported, so that we can also get rid of searching
> > the thermal-zones' child node, I improved the description as below, is it OK?
> >
> 
> Device tree is used to describe HW.
> #thermal-sensor-cells is less to be an optional parameter to me.
> If HW supports, then it should be 1 and update the example accordingly.

OK, I changed it to "1" in V10 patch series.

Thanks,
Anson.

> 
> Regards
> Dong Aisheng
> 
> >  41 +- imx,sensor-resource-id:      A single integer for single thermal zone's
> > resource ID or
> >  42 +                               an array of integers to specify each
> > thermal zone's sensor
> >  43 +                               resource ID.