| Message ID | 20221011231727.8090-6-bb@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | enable VTM node of all TI's K3 SoCs | expand |
On 11/10/2022 19:17, Bryan Brattlof wrote: > Elaborate on the function of this device node as well as some of the > properties that this node uses. > > Signed-off-by: Bryan Brattlof <bb@ti.com> > --- > .../bindings/thermal/ti,j72xx-thermal.yaml | 27 ++++++++++++++++++- > 1 file changed, 26 insertions(+), 1 deletion(-) > > diff --git a/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml b/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml > index c74f124ebfc00..0b6a6fa07a532 100644 > --- a/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml > +++ b/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml > @@ -9,6 +9,24 @@ title: Texas Instruments J72XX VTM (DTS) binding > maintainers: > - Keerthy <j-keerthy@ti.com> > > +description: | > + The TI K3 family of SoCs typically have a Voltage & Thermal > + Management (VTM) device to control up to 8 temperature diode > + sensors to measure silicon junction temperatures from different > + hotspots of the chip as well as provide temperature, interrupt > + and alerting information. > + > + The VTM device will periodically enable these temperature sensors > + to make a temperature measurement and store the reported data > + allowing the sensors to stay in a reset state when not in use > + to maximize the sensor's life. > + > + This VTM driver will then use the following polynomial equation to "VTM driver" is some physical/electronic element called driver? Or Linux driver? If the latter, drop it and just describe the equation. > + calculate the temperature from the value stored in the VTM device. > + > + Temp = (-9.2627e-12) * x^4 + (6.0373e-08) * x^3 + \ > + (-1.7058e-04) * x^2 + (3.2512e-01) * x + (-4.9003e+01) > + > properties: > compatible: > enum: > @@ -19,9 +37,16 @@ properties: > items: > - description: VTM cfg1 register space > - description: VTM cfg2 register space > - - description: VTM efuse register space > + - description: | > + A software trimming method must be applied to some Jacinto > + devices to function properly. This eFuse region provides > + the information needed for these SoCs to report > + temperatures accurately. > > power-domains: > + description: | > + Should contain the phandle to a power management (PM) domain > + node and the device-id of this device. This is quite generic - why adding it? > maxItems: 1 > > "#thermal-sensor-cells": Best regards, Krzysztof
On October 12, 2022 thus sayeth Krzysztof Kozlowski: > On 11/10/2022 19:17, Bryan Brattlof wrote: > > Elaborate on the function of this device node as well as some of the > > properties that this node uses. > > > > Signed-off-by: Bryan Brattlof <bb@ti.com> > > --- > > .../bindings/thermal/ti,j72xx-thermal.yaml | 27 ++++++++++++++++++- > > 1 file changed, 26 insertions(+), 1 deletion(-) > > > > diff --git a/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml b/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml > > index c74f124ebfc00..0b6a6fa07a532 100644 > > --- a/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml > > +++ b/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml > > @@ -9,6 +9,24 @@ title: Texas Instruments J72XX VTM (DTS) binding > > maintainers: > > - Keerthy <j-keerthy@ti.com> > > > > +description: | > > + The TI K3 family of SoCs typically have a Voltage & Thermal > > + Management (VTM) device to control up to 8 temperature diode > > + sensors to measure silicon junction temperatures from different > > + hotspots of the chip as well as provide temperature, interrupt > > + and alerting information. > > + > > + The VTM device will periodically enable these temperature sensors > > + to make a temperature measurement and store the reported data > > + allowing the sensors to stay in a reset state when not in use > > + to maximize the sensor's life. > > + > > + This VTM driver will then use the following polynomial equation to > > "VTM driver" is some physical/electronic element called driver? Or Linux > driver? If the latter, drop it and just describe the equation. Yeah I was trying to talk about the Linux driver. I'll edit it to only the equation. > > > + calculate the temperature from the value stored in the VTM device. > > + > > + Temp = (-9.2627e-12) * x^4 + (6.0373e-08) * x^3 + \ > > + (-1.7058e-04) * x^2 + (3.2512e-01) * x + (-4.9003e+01) > > + > > properties: > > compatible: > > enum: > > @@ -19,9 +37,16 @@ properties: > > items: > > - description: VTM cfg1 register space > > - description: VTM cfg2 register space > > - - description: VTM efuse register space > > + - description: | > > + A software trimming method must be applied to some Jacinto > > + devices to function properly. This eFuse region provides > > + the information needed for these SoCs to report > > + temperatures accurately. > > > > power-domains: > > + description: | > > + Should contain the phandle to a power management (PM) domain > > + node and the device-id of this device. > > This is quite generic - why adding it? This was really a "while I'm here" addition. But there is no need, I can drop this Thanks again Krzysztof ~Bryan
On 12/10/2022 14:19, Bryan Brattlof wrote: >>> + temperatures accurately. >>> >>> power-domains: >>> + description: | >>> + Should contain the phandle to a power management (PM) domain >>> + node and the device-id of this device. >> >> This is quite generic - why adding it? > > This was really a "while I'm here" addition. But there is no need, I can > drop this Drop it, we do not describe generic properties (already described in core schema). Best regards, Krzysztof
diff --git a/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml b/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml index c74f124ebfc00..0b6a6fa07a532 100644 --- a/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml +++ b/Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml @@ -9,6 +9,24 @@ title: Texas Instruments J72XX VTM (DTS) binding maintainers: - Keerthy <j-keerthy@ti.com> +description: | + The TI K3 family of SoCs typically have a Voltage & Thermal + Management (VTM) device to control up to 8 temperature diode + sensors to measure silicon junction temperatures from different + hotspots of the chip as well as provide temperature, interrupt + and alerting information. + + The VTM device will periodically enable these temperature sensors + to make a temperature measurement and store the reported data + allowing the sensors to stay in a reset state when not in use + to maximize the sensor's life. + + This VTM driver will then use the following polynomial equation to + calculate the temperature from the value stored in the VTM device. + + Temp = (-9.2627e-12) * x^4 + (6.0373e-08) * x^3 + \ + (-1.7058e-04) * x^2 + (3.2512e-01) * x + (-4.9003e+01) + properties: compatible: enum: @@ -19,9 +37,16 @@ properties: items: - description: VTM cfg1 register space - description: VTM cfg2 register space - - description: VTM efuse register space + - description: | + A software trimming method must be applied to some Jacinto + devices to function properly. This eFuse region provides + the information needed for these SoCs to report + temperatures accurately. power-domains: + description: | + Should contain the phandle to a power management (PM) domain + node and the device-id of this device. maxItems: 1 "#thermal-sensor-cells":
Elaborate on the function of this device node as well as some of the properties that this node uses. Signed-off-by: Bryan Brattlof <bb@ti.com> --- .../bindings/thermal/ti,j72xx-thermal.yaml | 27 ++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-)