Subject: Re: [PATCH V10 1/4] dt-bindings: fsl: scu: add thermal binding

From: Zhang Rui <[email-masked]>
Date: Tue, 09 Apr 2019 15:28:30 +0800

On 二, 2019-04-09 at 05:28 +0000, Anson Huang wrote:
> Ping...
> Can anyone provide some suggestion about how to proceed next?
> 
Hi, Eduardo,

I guess you will comment on this patch, right?
Or else I will take the patch following Rob' suggestion.

thanks,
rui

> Best Regards!
> Anson Huang
> 
> > 
> > -----Original Message-----
> > From: Anson Huang
> > Sent: 2019年3月26日 10:45
> > To: 'Rob Herring' <[email-masked]>; [email-masked]'
> > <[email-masked]>
> > Cc: [email-masked]' <[email-masked]>;
> > [email-masked]' <[email-masked]>; [email-masked]
> > e'
> > <[email-masked]>; [email-masked]'
> > <[email-masked]>; [email-masked]' <[email-masked]>;
> > [email-masked]' <[email-masked]>;
> > [email-masked]' <[email-masked]>; [email-masked]'
> > <[email-masked]>; [email-masked]' <[email-masked]>;
> > [email-masked]' <[email-masked]>; Aisheng
> > Dong
> > <[email-masked]>; [email-masked]'
> > <[email-masked]>; [email-masked]' <[email-masked]>;
> > Daniel
> > Baluta <[email-masked]>; Andy Gross <[email-masked]>;
> > [email-masked]' <[email-masked]>;
> > [email-masked]' <[email-masked]>; [email-masked]' <[email-masked]
> > >;
> > [email-masked]' <[email-masked]>;
> > [email-masked]' <[email-masked]>;
> > [email-masked]' <[email-masked]>;
> > [email-masked]' <[email-masked]>;
> > [email-masked]' <[email-masked]>; [email-masked]
> > t'
> > <[email-masked]>; [email-masked]'
> > <[email-masked]>; [email-masked]'
> > <linux-
> > [email-masked]>; [email-masked]'
> > <linux-arm-
> > [email-masked]>; [email-masked]' <linux-
> > [email-masked]>; dl-linux-imx <[email-masked]>
> > Subject: RE: [PATCH V10 1/4] dt-bindings: fsl: scu: add thermal
> > binding
> > 
> > Ping...
> > 
> > Hi, Eduardo
> > 	What is your opinion about where to put the HW resource ID in
> > DT?
> > 
> > Best Regards!
> > Anson Huang
> > 
> > > 
> > > -----Original Message-----
> > > From: Anson Huang
> > > Sent: 2019年3月13日 16:12
> > > To: 'Rob Herring' <[email-masked]>; [email-masked]'
> > > <[email-masked]>
> > > Cc: [email-masked]' <[email-masked]>;
> > > [email-masked]' <[email-masked]>;
> > [email-masked]'
> > > 
> > > <[email-masked]>; [email-masked]'
> > > <[email-masked]>; [email-masked]' <[email-masked]
> > > >;
> > > [email-masked]' <[email-masked]>;
> > > [email-masked]' <[email-masked]>; [email-masked]
> > > '
> > > <[email-masked]>; [email-masked]' <[email-masked]
> > > >;
> > > [email-masked]' <[email-masked]>; Aisheng
> > > Dong
> > > <[email-masked]>; [email-masked]'
> > > <[email-masked]>; [email-masked]' <[email-masked]>;
> > > Daniel Baluta <[email-masked]>; Andy Gross
> > > <[email-masked]>; [email-masked]'
> > > <[email-masked]>; [email-masked]' <[email-masked]>
> > > ;
> > > [email-masked]' <[email-masked]>; [email-masked]'
> > > <[email-masked]>; [email-masked]'
> > > <[email-masked]>; [email-masked]'
> > > <[email-masked]>; [email-masked]'
> > > <[email-masked]>; [email-masked]'
> > <[email-masked]>; [email-masked]'
> > > 
> > > <[email-masked]>; [email-masked]'
> > > <[email-masked]>; [email-masked]'
> > > <linux-
> > > [email-masked]>; [email-masked]'
> > > <linux-arm- [email-masked]>; [email-masked]
> > > g'
> > > <linux- [email-masked]>; dl-linux-imx <[email-masked]>
> > > Subject: RE: [PATCH V10 1/4] dt-bindings: fsl: scu: add thermal
> > > binding
> > > 
> > > Ping...
> > > Hi, Eduardo
> > > 	Can you take a look at this thread? Thanks.
> > > 
> > > 
> > > Best Regards!
> > > Anson Huang
> > > 
> > > > 
> > > > -----Original Message-----
> > > > From: Anson Huang
> > > > Sent: 2019年3月6日 13:27
> > > > To: 'Rob Herring' <[email-masked]>; [email-masked]'
> > > > <[email-masked]>
> > > > Cc: [email-masked]' <[email-masked]>;
> > > > [email-masked]' <[email-masked]>;
> > > [email-masked]'
> > > > 
> > > > <[email-masked]>; [email-masked]'
> > > > <[email-masked]>; [email-masked]'
> > <[email-masked]>;
> > > 
> > > > 
> > > > [email-masked]' <[email-masked]>;
> > > > [email-masked]' <[email-masked]>; [email-masked]
> > > > om'
> > > > <[email-masked]>; [email-masked]'
> > <[email-masked]>;
> > > 
> > > > 
> > > > [email-masked]' <[email-masked]>;
> > > > Aisheng
> > > > Dong <[email-masked]>; [email-masked]'
> > > > <[email-masked]>; [email-masked]' <[email-masked]>
> > > > ;
> > > > Daniel Baluta <[email-masked]>; Andy Gross
> > > > <[email-masked]>; [email-masked]'
> > > > <[email-masked]>; [email-masked]' <[email-masked]
> > > > e>;
> > > > [email-masked]' <[email-masked]>; [email-masked]'
> > > > <[email-masked]>; [email-masked]'
> > > > <[email-masked]>; [email-masked]'
> > > > <[email-masked]>; [email-masked]'
> > > > <[email-masked]>; [email-masked]'
> > > <[email-masked]>; [email-masked]'
> > > > 
> > > > <[email-masked]>; [email-masked]'
> > > > <[email-masked]>; [email-masked]'
> > > > <linux-
> > > > [email-masked]>; [email-masked]'
> > > > <linux-arm- [email-masked]>; [email-masked].
> > > > org'
> > > > <linux- [email-masked]>; dl-linux-imx <[email-masked]>
> > > > Subject: RE: [PATCH V10 1/4] dt-bindings: fsl: scu: add thermal
> > > > binding
> > > > 
> > > > Ping...
> > > > 
> > > > Hi, Eduardo
> > > > 	Looks like we are going around in circle, can we make
> > > > decision of
> > > > which direction to go?
> > > > 
> > > > Best Regards!
> > > > Anson Huang
> > > > 
> > > > > 
> > > > > -----Original Message-----
> > > > > From: Anson Huang
> > > > > Sent: 2019年3月1日 9:41
> > > > > To: 'Rob Herring' <[email-masked]>; [email-masked]
> > > > > Cc: [email-masked]; [email-masked];
> > > > [email-masked];
> > > > > 
> > > > > [email-masked]; [email-masked];
> > > [email-masked];
> > > > 
> > > > > 
> > > > > [email-masked]; [email-masked]; [email-masked]
> > > > > ;
> > > > > [email-masked]; Aisheng Dong <[email-masked]
> > > > > >;
> > > > > [email-masked]; [email-masked]; Daniel Baluta
> > > > > <[email-masked]>; Andy Gross <[email-masked]>;
> > > > > [email-masked]; [email-masked]; [email-masked];
> > > > > [email-masked]; [email-masked];
> > > > > [email-masked]; [email-masked];
> > > > > [email-masked]; [email-masked];
> > > > > [email-masked]; [email-masked];
> > > > > [email-masked];
> > > > > linux- [email-masked]; dl-linux-imx <[email-masked]>
> > > > > Subject: RE: [PATCH V10 1/4] dt-bindings: fsl: scu: add
> > > > > thermal
> > > > > binding
> > > > > 
> > > > > Hi, Rob/Eduardo
> > > > > 
> > > > > Best Regards!
> > > > > Anson Huang
> > > > > 
> > > > > > 
> > > > > > -----Original Message-----
> > > > > > From: Rob Herring [mailto:[email-masked]]
> > > > > > Sent: 2019年2月28日 22:49
> > > > > > To: Anson Huang <[email-masked]>
> > > > > > Cc: [email-masked]; [email-masked];
> > > > > [email-masked];
> > > > > > 
> > > > > > [email-masked]; [email-masked];
> > > > [email-masked];
> > > > > 
> > > > > > 
> > > > > > [email-masked]; [email-masked]; [email-masked]
> > > > > > om;
> > > > > > [email-masked]; Aisheng Dong <[email-masked]
> > > > > > om>;
> > > > > > [email-masked]; [email-masked]; Daniel Baluta
> > > > > > <[email-masked]>; Andy Gross <[email-masked]>
> > > > > > ;
> > > > > > [email-masked]; [email-masked]; [email-masked];
> > > > > > [email-masked]; [email-masked];
> > > > > > [email-masked]; [email-masked];
> > > > > > [email-masked]; [email-masked];
> > > > > > [email-masked]; [email-masked];
> > > > > > [email-masked];
> > > > > > linux- [email-masked]; dl-linux-imx <[email-masked]>
> > > > > > Subject: Re: [PATCH V10 1/4] dt-bindings: fsl: scu: add
> > > > > > thermal
> > > > > > binding
> > > > > > 
> > > > > > On Wed, Feb 27, 2019 at 6:48 PM Anson Huang
> > > <[email-masked]>
> > > > 
> > > > > 
> > > > > > 
> > > > > > wrote:
> > > > > > > 
> > > > > > > 
> > > > > > > Hi, Rob
> > > > > > > 
> > > > > > > Best Regards!
> > > > > > > Anson Huang
> > > > > > > 
> > > > > > > > 
> > > > > > > > -----Original Message-----
> > > > > > > > From: Rob Herring [mailto:[email-masked]]
> > > > > > > > Sent: 2019年2月28日 7:55
> > > > > > > > To: Anson Huang <[email-masked]>
> > > > > > > > Cc: [email-masked]; [email-masked];
> > > > > > > > [email-masked]; [email-masked];
> > > > > [email-masked];
> > > > > > 
> > > > > > > 
> > > > > > > > 
> > > > > > > > [email-masked]; [email-masked];
> > > > > [email-masked];
> > > > > > 
> > > > > > > 
> > > > > > > > 
> > > > > > > > [email-masked]; [email-masked]; Aisheng
> > > > > > > > Dong
> > > > > > > > <[email-masked]>; [email-masked];
> > > > > > > > [email-masked]; Daniel Baluta <[email-masked]>
> > > > > > > > ;
> > > > > > > > Andy Gross <[email-masked]>;
> > > > > > > > [email-masked]; [email-masked]; arnd@arndb
> > > > > > > > .de;
> > > > > > > > [email-masked]; [email-masked];
> > > > > > > > [email-masked]; [email-masked]
> > > > > > > > m;
> > > > > > > > [email-masked]; [email-masked];
> > > > > > > > [email-masked]; [email-masked]
> > > > > > > > g;
> > > > > > > > [email-masked];
> > > > > > > > linux- [email-masked]; dl-linux-imx <linux-imx@nxp.
> > > > > > > > com>
> > > > > > > > Subject: Re: [PATCH V10 1/4] dt-bindings: fsl: scu: add
> > > > > > > > thermal binding
> > > > > > > > 
> > > > > > > > On Wed, Feb 27, 2019 at 08:46:21AM +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 <[email-masked]>
> > > > > > > > > ---
> > > > > > > > > Changes since V9:
> > > > > > > > >     - change #thermal-sensor-cells value in example
> > > > > > > > > to 1,
> > > > > > > > > since there are
> > > > > > > > other
> > > > > > > > > 
> > > > > > > > >       thermal sensors inside system controller, it is
> > > > > > > > > just
> > > > > > > > > because there are
> > > > > > > > still
> > > > > > > > > 
> > > > > > > > >       some issue, so system controller does NOT
> > > > > > > > > expose
> > > > > > > > > them for now,
> > > > > > > > they could
> > > > > > > > > 
> > > > > > > > >       be exposed later, so it should be 1 from HW
> > > > > > > > > perspective.
> > > > > > > > > ---
> > > > > > > > >  .../devicetree/bindings/arm/freescale/fsl,scu.txt   
> > > > > > > > > | 21
> > > > > > > > +++++++++++++++++++++
> > > > > > > > > 
> > > > > > > > >  1 file changed, 21 insertions(+)
> > > > > > > > > 
> > > > > > > > > diff --git
> > > > > > > > > a/Documentation/devicetree/bindings/arm/freescale/fsl
> > > > > > > > > ,scu.
> > > > > > > > > tx
> > > > > > > > > t
> > > > > > > > > b/Documentation/devicetree/bindings/arm/freescale/fsl
> > > > > > > > > ,scu.
> > > > > > > > > tx t index 72d481c..855270b 100644
> > > > > > > > > ---
> > > > > > > > > a/Documentation/devicetree/bindings/arm/freescale/fsl
> > > > > > > > > ,scu.
> > > > > > > > > tx
> > > > > > > > > t
> > > > > > > > > +++
> > b/Documentation/devicetree/bindings/arm/freescale/fsl,scu.
> > > 
> > > > 
> > > > > 
> > > > > > 
> > > > > > > 
> > > > > > > > 
> > > > > > > > > 
> > > > > > > > > +++ tx
> > > > > > > > > +++ t
> > > > > > > > > @@ -122,6 +122,21 @@ RTC bindings based on SCU
> > > > > > > > > Message
> > > > > Protocol
> > > > > > 
> > > > > > > 
> > > > > > > > 
> > > > > > > > > 
> > > > > > > > > Required properties:
> > > > > > > > >  - compatible: should be "fsl,imx8qxp-sc-rtc";
> > > > > > > > > 
> > > > > > > > > +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:  A single integer for
> > > > > > > > > single
> > > > > > > > > +thermal zone's
> > > > > > > > resource ID or
> > > > > > > > > 
> > > > > > > > > +                           an array of integers to
> > > > > > > > > + specify each thermal
> > > > > > > > zone's sensor
> > > > > > > > > 
> > > > > > > > > +                           resource ID.
> > > > > > > > Can't you put the resource ids in the thermal-sensor
> > > > > > > > cells?
> > > > > > > > Why do you need to list them here?
> > > > > > > For the thermal-sensor cells, if you meant the argument
> > > > > > > of
> > > > > > > tsens phandle, then the reason is that argument is for
> > > > > > > sensor
> > > > > > > index starting from 0, previous I use it for our resource
> > > > > > > ID,
> > > > > > > but it looks confused, since user will think there are
> > > > > > > many
> > > > > > > sensors there per
> > > > > Eduardo's comment.
> > > > > > 
> > > > > > > 
> > > > > > > 
> > > > > > > +                       thermal-sensors = <&tsens 0>;
> > > > > > > 
> > > > > > > If you meant putting it in each thermal sensor node
> > > > > > > instead of
> > "tsens"
> > > 
> > > > 
> > > > > 
> > > > > > 
> > > > > > > 
> > > > > > > node, then in previous patch series, I put this "
> > > > > > > imx,sensor-resource-id " property in each thermal sensor
> > > > > > > node,
> > > > > > > but the thermal sensor nodes are parsed by common thermal
> > > > > > > framework, thermal driver will need to find the thermal
> > > > > > > zone
> > > > > > > node and go through every child node to get the resource
> > > > > > > id
> > > > > > > again, so Eduardo suggested to put it in
> > > > > > our platform tsens node, that makes our thermal driver code
> > > > > > much
> > > > > > more simple.
> > > > > > 
> > > > > > The phandle args are meant to be an id typically. There's
> > > > > > absolutely no requirement they are 0-N based. They often
> > > > > > are
> > > > > > because things like interrupts are 0-N or clocks have no
> > > > > > h/w id.
> > > > > > If you already have an id,
> > > > use it.
> > > > > 
> > > > > > 
> > > > > > Don't invent your own.
> > > > > At the beginning, I put the HW resource ID in the "tsens"
> > > > > phandle
> > > > > argument of "thermal-sensors" node, see  below patch I sent
> > > > > before, the benefit is I do NOT need to add new property for
> > > > > passing HW resource ID to driver, the disadvantage is, I have
> > > > > to
> > > > > parse the thermal_zones' each child node and get the HW
> > > > > resource
> > > > > ID from phandle argument(searing thermal_zones node and go
> > > > > through
> > > > > all its child node, and get the phandle argument), they are
> > > > > by
> > > > > default ONLY parsed by thermal core driver. When we register
> > > > > thermal zone, we have to pass the HW resource ID when calling
> > > > > devm_thermal_zone_of_sensor_register(), if we add our own
> > > > > property
> > > > > to pass the HW resource ID, then no need to do so, we just
> > > > > pass
> > > > > the index 0-N for each thermal sensors in devicetree which
> > > > > also
> > > > > with phandle
> > > > argument 0- N. So using our own property makes the driver much
> > > > more
> > > > simple.
> > > > > 
> > > > > 
> > > > > So, @Eduardo, which direction I should go? Looks like Rob
> > > > > suggests
> > > > > just put the HW resource ID in the phandle argument like what
> > > > > I
> > > > > did at the beginning, can you advise?
> > > > > 
> > > > > Thanks,
> > > > > Anson.
> > > > > 
> > > > > https://patchwork.kernel.org/patch/10703849/
> > > > > > 
> > > > > > +	thermal_zones: thermal-zones {
> > > > > > +		cpu-thermal0 {
> > > > > > +			polling-delay-passive = <250>;
> > > > > > +			polling-delay = <2000>;
> > > > > > +			thermal-sensors = <&tsens 355>;
> > > > > > +			trips {
> > > > > > +				cpu_alert0: trip0 {
> > > > > > +					temperature =
> > > > > > <107000>;
> > > > > > +					hysteresis =
> > > > > > <2000>;
> > > > > > +					type = "passive";
> > > > > > +				};
> > > > > > 
> > > > > > 
> > > > > > Rob

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