[v5,0/4] thermal: k3_j72xx_bandgap: Add the bandgap driver support

Message

J, KEERTHY April 12, 2022, 10:14 a.m. UTC

Add VTM thermal support. In the Voltage Thermal Management
Module(VTM), K3 J72XX supplies a voltage reference and a temperature
sensor feature that are gathered in the band gap voltage and
temperature sensor (VBGAPTS) module. The band gap provides current and
voltage reference for its internal circuits and other analog IP
blocks. The analog-to-digital converter (ADC) produces an output value
that is proportional to the silicon temperature.

Currently reading temperatures only is supported.  There are no
active/passive cooling agent supported.

J721e SoCs have errata i2128: https://www.ti.com/lit/pdf/sprz455

The series also incorporates workaround for Errata i2128.

Daniel,

Apologies for the long silence on this!

- Keerthy

Changes in v5:

  * Fixed all the comments on v4.
  * Simplified the computation of the table.
  * Removed unnecessary members in the structures.

Changes in v4:

  * Fixed compilation warning with W=1.

Changes in v3:

  * Removed static look up tables & added functions to dynamically generate them.

Changes in v2:

  * Fixed DT binding errors.

Keerthy (4):
  dt-bindings: thermal: k3-j72xx: Add VTM bindings documentation
  arm64: dts: ti: j721e: Add VTM node
  arm64: dts: ti: j7200: Add VTM node
  thermal: k3_j72xx_bandgap: Add the bandgap driver support

 .../bindings/thermal/ti,j72xx-thermal.yaml    |  62 ++
 .../boot/dts/ti/k3-j7200-mcu-wakeup.dtsi      |   9 +
 arch/arm64/boot/dts/ti/k3-j7200-thermal.dtsi  |  45 ++
 arch/arm64/boot/dts/ti/k3-j7200.dtsi          |   4 +
 .../boot/dts/ti/k3-j721e-mcu-wakeup.dtsi      |   9 +
 arch/arm64/boot/dts/ti/k3-j721e-thermal.dtsi  |  73 ++
 arch/arm64/boot/dts/ti/k3-j721e.dtsi          |   4 +
 drivers/thermal/Makefile                      |   2 +-
 drivers/thermal/k3_j72xx_bandgap.c            | 623 ++++++++++++++++++
 9 files changed, 830 insertions(+), 1 deletion(-)
 create mode 100644 Documentation/devicetree/bindings/thermal/ti,j72xx-thermal.yaml
 create mode 100644 arch/arm64/boot/dts/ti/k3-j7200-thermal.dtsi
 create mode 100644 arch/arm64/boot/dts/ti/k3-j721e-thermal.dtsi
 create mode 100644 drivers/thermal/k3_j72xx_bandgap.c