Commit 8feaf0ce authored by Eduardo Valentin's avatar Eduardo Valentin Committed by Greg Kroah-Hartman
Browse files

staging: OMAP4+: thermal: introduce bandgap temperature sensor 



In the System Control Module, OMAP 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.

This patch provides a platform driver which expose this feature.
It is moduled as a MFD child of the System Control Module core
MFD driver.

This driver provides only APIs to access the device properties,
like temperature, thresholds and update rate.

Signed-off-by: default avatarEduardo Valentin <eduardo.valentin@ti.com>
Signed-off-by: default avatarJ Keerthy <j-keerthy@ti.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 493aa896

drivers/staging/Kconfig

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@@ -134,4 +134,6 @@ source "drivers/staging/gdm72xx/Kconfig" 


source "drivers/staging/csr/Kconfig"



source "drivers/staging/omap-thermal/Kconfig"



endif # STAGING

drivers/staging/Makefile

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@@ -59,3 +59,4 @@ obj-$(CONFIG_USB_WPAN_HCD) += ozwpan/ 
obj-$(CONFIG_USB_G_CCG)		+= ccg/

obj-$(CONFIG_WIMAX_GDM72XX)	+= gdm72xx/

obj-$(CONFIG_CSR_WIFI)		+= csr/

obj-$(CONFIG_OMAP_BANDGAP)	+= omap-thermal/

drivers/staging/omap-thermal/Kconfig

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config OMAP_BANDGAP

	tristate "Texas Instruments OMAP4+ temperature sensor driver"

	depends on THERMAL

	depends on ARCH_OMAP4 || SOC_OMAP5

	help

	  If you say yes here you get support for the Texas Instruments

	  OMAP4460+ on die bandgap temperature sensor support. The register

	  set is part of system control module.



	  This includes alert interrupts generation and also the TSHUT

	  support.

drivers/staging/omap-thermal/Makefile

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obj-$(CONFIG_OMAP_BANDGAP)	+= omap-thermal.o

omap-thermal-y			:= omap-bandgap.o

drivers/staging/omap-thermal/TODO

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List of TODOs (by Eduardo Valentin)



on omap-bandgap.c:

- Rework locking

- Improve driver code by adding usage of regmap-mmio

- Test every exposed API to userland

- Add support to hwmon

- Review and revisit all API exposed

- Revisit PM support

- Revisit data structures and simplify them

- Once SCM-core api settles, update this driver accordingly



on omap-thermal-common.c/omap-thermal.h:

- Revisit extrapolation constants for O4/O5

- Revisit need for locking

- Revisit trips and its definitions

- Revisit trending



on omap5-thermal.c

- Add support for GPU cooling



generally:

- write Kconfig dependencies so that omap variants are covered

- make checkpatch.pl and sparse happy

- make sure this code works on OMAP4430, OMAP4460 and OMAP5430

- update documentation



Copy patches to Eduardo Valentin <eduardo.valentin@ti.com>

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