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thermal: imx_tmu: extend with QorIQ/Layerscape TMU

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Add support for the on-die Thermal Monitoring Unit (TMU) of the
new QorIQ/Layerscape SoCs (LX2160A, LS1028A, LS1088A, ...):

examples on a lx2160:
  => temperature list
  | Device                  | Driver  | Parent
  | tmu@1f80000             | imx_tmu | root_driver
  | cluster67-thermal       | imx_tmu | tmu@1f80000
  | ddr1-cluster5-thermal   | imx_tmu | tmu@1f80000
  | wriop-thermal           | imx_tmu | tmu@1f80000
  | dce-qbman-hsio2-thermal | imx_tmu | tmu@1f80000
  | ccn-dpaa-tbu-thermal    | imx_tmu | tmu@1f80000
  | cluster4-hsio3-thermal  | imx_tmu | tmu@1f80000
  | cluster23-thermal       | imx_tmu | tmu@1f80000

  => temperature get tmu@1f80000
  tmu@1f80000: 82000 mC

  => temperature get wriop-thermal
  wriop-thermal: 81000 mC

The parent tmu@... node owns the MMIO and calibration; one
UCLASS_THERMAL device is bound per/thermal-zones site so each shows
up by its zone name:

  => dm tree
   ...
   thermal   2  [ + ]   imx_tmu   |-- tmu@1f80000
   thermal   3  [ + ]   imx_tmu   |   |-- cluster67-thermal
   thermal   4  [ + ]   imx_tmu   |   |-- ddr1-cluster5-thermal
   thermal   5  [ + ]   imx_tmu   |   |-- wriop-thermal
   thermal   6  [ + ]   imx_tmu   |   |-- dce-qbman-hsio2-thermal
   thermal   7  [ + ]   imx_tmu   |   |-- ccn-dpaa-tbu-thermal
   thermal   8  [ + ]   imx_tmu   |   |-- cluster4-hsio3-thermal
   thermal   9  [ + ]   imx_tmu   |   `-- cluster23-thermal
   ...

The dtsi additions mirror the existing fsl-ls1028a.dtsi: the LX2160A
SoC dtsi gains the tmu@1f80000 node plus a thermal-zones hierarchy
with 7 sites:

  cluster67-thermal       site 0  A72 clusters 6 + 7
  ddr1-cluster5-thermal   site 1  DDR1 + A72 cluster 5
  wriop-thermal           site 2  WRIOP
  dce-qbman-hsio2-thermal site 3  DCE + QBMAN + HSIO2
  ccn-dpaa-tbu-thermal    site 4  CCN508 + DPAA + TBU
  cluster4-hsio3-thermal  site 5  A72 cluster 4 + HSIO3
  cluster23-thermal       site 6  A72 clusters 2 + 3

Signed-off-by: Vincent Jardin <vjardin@free.fr>
Suggested-by: Tom Rini <trini@konsulko.com>
Inspired-by: Peng Fan <peng.fan@oss.nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Vincent Jardin
2026-05-28 14:57:07 +02:00
committed by Peng Fan
parent 903e861b71
commit 846f5fd2d1
5 changed files with 238 additions and 5 deletions
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30
arch/arm/include/asm/arch-fsl-layerscape/sys_proto.h Normal file
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright 2026 Free Mobile - Vincent Jardin
*
* Layerscape mirror of the i.MX <asm/mach-imx/sys_proto.h>: declares
* the SoC-personality helpers consumed by generic drivers that work on
* both i.MX and QorIQ/Layerscape parts (e.g. drivers/thermal/imx_tmu.c
* for the QorIQ TMU variant).
*/
#ifndef _ASM_ARCH_FSL_LAYERSCAPE_SYS_PROTO_H
#define _ASM_ARCH_FSL_LAYERSCAPE_SYS_PROTO_H
#include <linux/types.h>
/*
* Per LX2160A Reference Manual, Rev. 1 (10/2021):
* - section 1.12.1: "NXP specs max power at 105 degC junction" for
* commercial / embedded operating conditions.
* - section 28.1: TMU "Accuracy within +/- 3 degC".
*
* Layerscape SoCs do not expose an OCOTP-style "CPU temp grade" fuse,
* so the implementation returns the documented junction-temperature
* limit from the data sheet (-40 .. 105 degC commercial range). The
* thermal driver subtracts 10 degC for its alert threshold, which
* comfortably clears the +/- 3 degC TMU accuracy in both directions.
*/
u32 get_cpu_temp_grade(int *minc, int *maxc);
#endif /* _ASM_ARCH_FSL_LAYERSCAPE_SYS_PROTO_H */