linux-kernel - RE: [PATCH 3/7] dt-bindings: thermal: r9a09g047-tsu: Document the TSU unit

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Message-ID:
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Date: Wed, 26 Feb 2025 15:40:36 +0000
From: John Madieu <john.madieu.xa@...renesas.com>
To: Rob Herring <robh@...nel.org>
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Subject: RE: [PATCH 3/7] dt-bindings: thermal: r9a09g047-tsu: Document the TSU
 unit

Hi Rob,

Thanks for your review.

> -----Original Message-----
> From: Rob Herring <robh@...nel.org>
> Sent: Thursday, February 20, 2025 8:17 PM
> Subject: Re: [PATCH 3/7] dt-bindings: thermal: r9a09g047-tsu: Document the
> TSU unit
> 
> On Thu, Feb 20, 2025 at 04:26:08PM +0100, John Madieu wrote:
> > The Renesas RZ/G3E SoC includes a Thermal Sensor Unit (TSU) block
> > designed to measure the junction temperature. The device provides
> > real-time temperature measurements for thermal management, utilizing a
> > single dedicated channel (channel 1) for temperature sensing.
> >
> > Signed-off-by: John Madieu <john.madieu.xa@...renesas.com>
> > ---
> >  .../thermal/renesas,r9a09g047-tsu.yaml        | 123 ++++++++++++++++++
> >  1 file changed, 123 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/thermal/renesas,r9a09g047-tsu.yaml
> >
> > diff --git
> > a/Documentation/devicetree/bindings/thermal/renesas,r9a09g047-tsu.yaml
> > b/Documentation/devicetree/bindings/thermal/renesas,r9a09g047-tsu.yaml
> > new file mode 100644
> > index 000000000000..dbd3860a31d0
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/thermal/renesas,r9a09g047-tsu.
> > +++ yaml
> > @@ -0,0 +1,123 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) %YAML 1.2
> > +---
> > +title: Renesas RZ/G3E Temperature Sensor Unit (TSU)
> > +
> > +maintainers:
> > +  - John Madieu <john.madieu.xa@...renesas.com>
> > +
> > +description: |
> 
> Don't need '|' if there is no formatting to preserve.

Got it, Thanks! Will remove it in v2 since there is no
special formatting requirement here.

> 
> > +  The Temperature Sensor Unit (TSU) is an integrated thermal sensor
> > + that monitors
> 
> Wrap lines at <80 char.

Will do in v2.

> 
> > +  the chip temperature on the Renesas RZ/G3E SoC. The TSU provides
> > + real-time  temperature measurements for thermal management.
> > +
> > +properties:
> > +  compatible:
> > +    const: renesas,r9a09g047-tsu
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +  resets:
> > +    maxItems: 1
> > +
> > +  power-domains:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    description: |
> > +      Interrupt specifiers for the TSU:
> > +      - S12TSUADI1: Conversion complete interrupt signal (pulse)
> > +      - S12TSUADCMPI1: Comparison result interrupt signal (level)
> > +
> > +  interrupt-names:
> > +    items:
> > +      - const: S12TSUADI1
> > +      - const: S12TSUADCMPI1
> 
> Odd names for the interrupts... 'S12TSUAD' is the same for both, so that
> part is redundant from my perspective. I guess if these strings are
> meaningful for anyone familiar with this h/w, then it's fine.

These names come from HW manual. I can change them into "conv"
(for conversion complete irq)  and "cmp" (for comparison
complete irq). What do you think ?

> 
> > +
> > +  "#thermal-sensor-cells":
> > +    const: 0
> > +
> > +  renesas,tsu-calibration-sys:
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +    description: |
> > +      Phandle to the system controller (sys) that contains the TSU
> > +      calibration values used for temperature calculations.
> > +
       sensor_crit: sensor-crit {
> > +                    temperature = <120000>;
> > +                    hysteresis = <1000>;
> > +                    type = "critical";
> > +                };
> > +            };
> > +        };
> > +    };

Cheers,
John!

> > --
> > 2.25.1
> >