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Date: Fri, 15 Jul 2016 15:45:05 +0800 From: Fu Wei <fu.wei@...aro.org> To: "Rafael J. Wysocki" <rafael@...nel.org> Cc: Guenter Roeck <linux@...ck-us.net>, "Rafael J. Wysocki" <rjw@...ysocki.net>, Len Brown <lenb@...nel.org>, Daniel Lezcano <daniel.lezcano@...aro.org>, Thomas Gleixner <tglx@...utronix.de>, Marc Zyngier <marc.zyngier@....com>, Lorenzo Pieralisi <lorenzo.pieralisi@....com>, Sudeep Holla <sudeep.holla@....com>, Hanjun Guo <hanjun.guo@...aro.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linaro-acpi@...ts.linaro.org" <linaro-acpi@...ts.linaro.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, ACPI Devel Maling List <linux-acpi@...r.kernel.org>, rruigrok@...eaurora.org, harba@...eaurora.org, Christopher Covington <cov@...eaurora.org>, Timur Tabi <timur@...eaurora.org>, G Gregory <graeme.gregory@...aro.org>, Al Stone <al.stone@...aro.org>, Jon Masters <jcm@...hat.com>, wei@...hat.com, Arnd Bergmann <arnd@...db.de>, Wim Van Sebroeck <wim@...ana.be>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, Suravee Suthikulanit <Suravee.Suthikulpanit@....com>, Leo Duran <leo.duran@....com>, "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>, David Miller <davem@...emloft.net>, Andrew Morton <akpm@...ux-foundation.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, kvalo@...eaurora.org, mchehab@...nel.org, Jiri Slaby <jslaby@...e.cz>, Christoffer Dall <christoffer.dall@...aro.org>, Julien Grall <julien.grall@....com> Subject: Re: [PATCH v7 4/9] acpi/arm64: Add GTDT table parse driver Hi Rafael, On 14 July 2016 at 05:43, Rafael J. Wysocki <rafael@...nel.org> wrote: > On Wed, Jul 13, 2016 at 11:08 PM, Guenter Roeck <linux@...ck-us.net> wrote: >> On Wed, Jul 13, 2016 at 10:30:37PM +0200, Rafael J. Wysocki wrote: >>> On Wed, Jul 13, 2016 at 7:53 PM, <fu.wei@...aro.org> wrote: >>> > From: Fu Wei <fu.wei@...aro.org> >>> > >>> > This patch adds support for parsing arch timer in GTDT, >>> > provides some kernel APIs to parse all the PPIs and >>> > always-on info in GTDT and export them. >>> > >>> > By this driver, we can simplify arm_arch_timer drivers, and >>> > separate the ACPI GTDT knowledge from it. >>> > >>> > Signed-off-by: Fu Wei <fu.wei@...aro.org> >>> > Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org> >>> > --- >>> > drivers/acpi/Kconfig | 5 ++ >>> > drivers/acpi/Makefile | 1 + >>> > drivers/acpi/arm64/Kconfig | 15 ++++ >>> > drivers/acpi/arm64/Makefile | 1 + >>> > drivers/acpi/arm64/acpi_gtdt.c | 170 +++++++++++++++++++++++++++++++++++++++++ >>> > include/linux/acpi.h | 6 ++ >>> > 6 files changed, 198 insertions(+) >>> > >>> > diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig >>> > index b7e2e77..1cdc7d2 100644 >>> > --- a/drivers/acpi/Kconfig >>> > +++ b/drivers/acpi/Kconfig >>> > @@ -521,4 +521,9 @@ config XPOWER_PMIC_OPREGION >>> > >>> > endif >>> > >>> > +if ARM64 >>> > +source "drivers/acpi/arm64/Kconfig" >>> > + >>> > +endif >>> > + >>> > endif # ACPI >>> > diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile >>> > index 251ce85..1a94ff7 100644 >>> > --- a/drivers/acpi/Makefile >>> > +++ b/drivers/acpi/Makefile >>> > @@ -99,5 +99,6 @@ obj-$(CONFIG_ACPI_EXTLOG) += acpi_extlog.o >>> > obj-$(CONFIG_PMIC_OPREGION) += pmic/intel_pmic.o >>> > obj-$(CONFIG_CRC_PMIC_OPREGION) += pmic/intel_pmic_crc.o >>> > obj-$(CONFIG_XPOWER_PMIC_OPREGION) += pmic/intel_pmic_xpower.o >>> > +obj-$(CONFIG_ARM64) += arm64/ >>> > >>> > video-objs += acpi_video.o video_detect.o >>> > diff --git a/drivers/acpi/arm64/Kconfig b/drivers/acpi/arm64/Kconfig >>> > new file mode 100644 >>> > index 0000000..ff5c253 >>> > --- /dev/null >>> > +++ b/drivers/acpi/arm64/Kconfig >>> > @@ -0,0 +1,15 @@ >>> > +# >>> > +# ACPI Configuration for ARM64 >>> > +# >>> > + >>> > +menu "The ARM64-specific ACPI Support" >>> > + >>> > +config ACPI_GTDT >>> > + bool "ACPI GTDT table Support" >>> >>> This should depend on ARM64. >>> >>> Also I wonder if it needs to be user-selectable? Wouldn't it be >>> better to enable it by default when building for ARM64 with ACPI? >>> >> It is currently selected in patch 9, in the watchdog driver's Kconfig >> entry. > > Well, it still doesn't have to be user-selectable for that. :-) Actually it is also automatically selected by [PATCH v7 6/9]: diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 47352d2..71d5b30 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -8,6 +8,7 @@ config CLKSRC_OF config CLKSRC_ACPI bool select CLKSRC_PROBE + select ACPI_GTDT if ARM64 config CLKSRC_PROBE bool > >> Not sure if I like that; maybe the watchdog driver should depend >> on it instead ? > > If the watchdog is not the only user of it (and I don't think it is), > it would be better to arrange things this way. > There are two user: (1) arm_arch_timer(which will select CLKSRC_ACPI if ACPI, then CLKSRC_ACPI will select ACPI_GTDT if ARM64) So arm_arch_timer will automatically selecte ACPI_GTDT if ARM64 && ACPI (2) sbsa_gwdt (which will select ACPI_GTDT if ACPI in [PATCH v7 9/9]) So sbsa_gwdt will automatically selecte ACPI_GTDT if ARM64 && ACPI && ARM_ARCH_TIMER So ACPI_GTDT is automatically selected by both of two users. But like Timur said before: maybe we just "selecte ACPI_GTDT if ACPI" for ARM64, because ARM64 require GTDT if we use ACPI. > Thanks, > Rafael -- Best regards, Fu Wei Software Engineer Red Hat
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