Date:	Mon, 07 Oct 2013 16:10:29 +0200
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Eduardo Valentin <eduardo.valentin@...com>
Cc:	Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] thermal: offer TI thermal support only when ARCH_OMAP2PLUS
 is defined

On Monday, October 07, 2013 12:50:54 PM Bartlomiej Zolnierkiewicz wrote:
> On Monday, October 07, 2013 11:57:16 AM Bartlomiej Zolnierkiewicz wrote:
> > 
> > Hi,
> > 
> > On Friday, October 04, 2013 02:22:30 PM Eduardo Valentin wrote:
> > > On 04-10-2013 08:35, Bartlomiej Zolnierkiewicz wrote:
> > > > Menu for Texas Instruments thermal support is visible on all
> > > > platforms and TI_SOC_THERMAL + TI_THERMAL config options can
> > > > be selected also on EXYNOS platform (on which ARCH_HAS_BANDGAP
> > > > config option is selected by SoCs config options to fulfill
> > > > EXYNOS_THERMAL config option dependency). Thus the code which
> > > > is never used can be build. Fix it by making TI menu dependent
> > > > on ARCH_OMAP2PLUS config option.
> > > > 
> > > > Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> > > > Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
> > > > ---
> > > >  drivers/thermal/Kconfig | 1 +
> > > >  1 file changed, 1 insertion(+)
> > > > 
> > > > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> > > > index 57e06a9..a709c63 100644
> > > > --- a/drivers/thermal/Kconfig
> > > > +++ b/drivers/thermal/Kconfig
> > > > @@ -193,6 +193,7 @@ config X86_PKG_TEMP_THERMAL
> > > >  	  notification methods.
> > > >  
> > > >  menu "Texas Instruments thermal drivers"
> > > > +depends on ARCH_OMAP2PLUS
> > > 
> > > No, this driver is not for ARCH_OMAP*, but for TI bandgap, with the
> > > option to offer thermal control. So, the HW supported is TI bandgap IP,
> > > not ARCH_OMAP*. It happens to be so that OMAP2PLUS all have a
> > > (different) version of this device.
> > > 
> > > However, DRA7 devices, for instance, also feature the bandgap IP
> > > (different version of those present in OMAP devices), and it is not
> > > ARCH_OMAP2PLUS.
> > 
> > Then you have wrong dependencies anyway since ARCH_BANDGAP is selected
> 
> s/ARCH_BANDGAP/ARCH_HAS_BANDGAP/
> 
> > currently only by ARCH_OMAP2PLUS and EXYNOS SoCs.

It seems that SOC_DRA7xx config option is dependent on ARCH_OMAP2PLUS one
*anyway* (thus it doesn't need to select ARCH_HAS_BANDGAP on its own). Thus
my patch is correct and sufficient for the current TI bandgap IP support.

if ARCH_OMAP2PLUS

menu "TI OMAP2/3/4 Specific Features"

config ARCH_OMAP2PLUS_TYPICAL
	bool "Typical OMAP configuration"
	default y
	select AEABI
	select HIGHMEM
	select I2C
	select I2C_OMAP
	select MENELAUS if ARCH_OMAP2
	select NEON if CPU_V7
	select PM_RUNTIME
	select REGULATOR
	select TWL4030_CORE if ARCH_OMAP3 || ARCH_OMAP4
	select TWL4030_POWER if ARCH_OMAP3 || ARCH_OMAP4
	select VFP
	help
	  Compile a kernel suitable for booting most boards

config SOC_HAS_OMAP2_SDRC
	bool "OMAP2 SDRAM Controller support"

config SOC_HAS_REALTIME_COUNTER
	bool "Real time free running counter"
	depends on SOC_OMAP5 || SOC_DRA7XX
	default y

config SOC_DRA7XX
	bool "TI DRA7XX"
	select ARM_ARCH_TIMER
	select CPU_V7
	select ARM_GIC
	select HAVE_SMP
	select COMMON_CLK
...

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> > arch/arm/mach-omap2/Kconfig (next-20130927):
> > 
> > config ARCH_OMAP2PLUS
> >         bool
> >         select ARCH_HAS_BANDGAP
> >         select ARCH_HAS_CPUFREQ
> >         select ARCH_HAS_HOLES_MEMORYMODEL
> >         select ARCH_OMAP
> >         select ARCH_REQUIRE_GPIOLIB
> >         select CLKDEV_LOOKUP
> >         select CLKSRC_MMIO
> >         select GENERIC_CLOCKEVENTS
> >         select GENERIC_IRQ_CHIP
> >         select HAVE_CLK
> >         select OMAP_DM_TIMER
> >         select PINCTRL
> >         select PROC_DEVICETREE if PROC_FS
> >         select SOC_BUS
> >         select SPARSE_IRQ
> >         select TI_PRIV_EDMA
> >         select USE_OF
> >         help
> >           Systems based on OMAP2, OMAP3, OMAP4 or OMAP5
> > 
> > drivers/thermal/ti-soc-thermal/Kconfig (next-20130927):
> > 
> > config TI_SOC_THERMAL
> >         tristate "Texas Instruments SoCs temperature sensor driver"
> >         depends on THERMAL
> >         depends on ARCH_HAS_BANDGAP
> >         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.
> 
> and for EXYNOS it looks like that (next-20130927):
> 
> arch/arm/mach-exynos/Kconfig:
> 
> config CPU_EXYNOS4210
> 	bool "SAMSUNG EXYNOS4210"
> 	default y
> 	depends on ARCH_EXYNOS4
> 	select ARCH_HAS_BANDGAP
> 	select ARM_CPU_SUSPEND if PM
> 	select PINCTRL_EXYNOS
> 	select PM_GENERIC_DOMAINS if PM
> 	select S5P_PM if PM
> 	select S5P_SLEEP if PM
> 	select SAMSUNG_DMADEV
> 	help
> 	  Enable EXYNOS4210 CPU support
> 
> config SOC_EXYNOS4212
> 	bool "SAMSUNG EXYNOS4212"
> 	default y
> 	depends on ARCH_EXYNOS4
> 	select ARCH_HAS_BANDGAP
> 	select PINCTRL_EXYNOS
> 	select PM_GENERIC_DOMAINS if PM
> 	select S5P_PM if PM
> 	select S5P_SLEEP if PM
> 	select SAMSUNG_DMADEV
> 	help
> 	  Enable EXYNOS4212 SoC support
> 
> config SOC_EXYNOS4412
> 	bool "SAMSUNG EXYNOS4412"
> 	default y
> 	depends on ARCH_EXYNOS4
> 	select ARCH_HAS_BANDGAP
> 	select PINCTRL_EXYNOS
> 	select PM_GENERIC_DOMAINS if PM
> 	select SAMSUNG_DMADEV
> 	help
> 	  Enable EXYNOS4412 SoC support
> 
> config SOC_EXYNOS5250
> 	bool "SAMSUNG EXYNOS5250"
> 	default y
> 	depends on ARCH_EXYNOS5
> 	select ARCH_HAS_BANDGAP
> 	select PINCTRL_EXYNOS
> 	select PM_GENERIC_DOMAINS if PM
> 	select S5P_PM if PM
> 	select S5P_SLEEP if PM
> 	select S5P_DEV_MFC
> 	select SAMSUNG_DMADEV
> 	help
> 	  Enable EXYNOS5250 SoC support
> 
> config SOC_EXYNOS5420
> 	bool "SAMSUNG EXYNOS5420"
> 	default y
> 	depends on ARCH_EXYNOS5
> 	select PM_GENERIC_DOMAINS if PM
> 	select S5P_PM if PM
> 	select S5P_SLEEP if PM
> 	help
> 	  Enable EXYNOS5420 SoC support
> 
> config SOC_EXYNOS5440
> 	bool "SAMSUNG EXYNOS5440"
> 	default y
> 	depends on ARCH_EXYNOS5
> 	select ARCH_DMA_ADDR_T_64BIT if ARM_LPAE
> 	select ARCH_HAS_BANDGAP
> 	select ARCH_HAS_OPP
> 	select HAVE_ARM_ARCH_TIMER
> 	select AUTO_ZRELADDR
> 	select MIGHT_HAVE_PCI
> 	select PCI_DOMAINS if PCI
> 	select PINCTRL_EXYNOS5440
> 	select PM_OPP
> 	help
> 	  Enable EXYNOS5440 SoC support
> 
> drivers/thermal/Kconfig:
> 
> menu "Samsung thermal drivers"
> depends on PLAT_SAMSUNG
> source "drivers/thermal/samsung/Kconfig"
> endmenu
> 
> drivers/thermal/samsung/Kconfig
> 
> config EXYNOS_THERMAL
> 	tristate "Exynos thermal management unit driver"
> 	depends on ARCH_HAS_BANDGAP && OF
> 	help
> 	  If you say yes here you get support for the TMU (Thermal Management
> 	  Unit) driver for SAMSUNG EXYNOS series of SoCs. This driver initialises
> 	  the TMU, reports temperature and handles cooling action if defined.
> 	  This driver uses the Exynos core thermal APIs and TMU configuration
> 	  data from the supported SoCs.
> 
> 
> > > And because of that, the design of this driver is different. It is not
> > > expected to depend on an arch, but the arch code is expected to select
> > > ARCH_HAS_BANDGAP.
> > 
> > There should be additional dependencies beside ARCH_BANDGAP, i.e. on
> 
> s/ARCH_BANDGAP/ARCH_HAS_BANDGAP/
> 
> > EXYNOS platforms we currently also have dependency on PLAT_SAMSUNG
> > (should be ARCH_EXYNOS instead, my other patch fixes it).
> > 
> > > >  source "drivers/thermal/ti-soc-thermal/Kconfig"
> > > >  endmenu
> > 
> > Best regards,
> > --
> > Bartlomiej Zolnierkiewicz
> > Samsung R&D Institute Poland
> > Samsung Electronics
> 
> Best regards,
> --
> Bartlomiej Zolnierkiewicz
> Samsung R&D Institute Poland
> Samsung Electronics

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