linux-kernel - Re: [patch 2.6.18-git] RTC class, Kconfig improvements

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Date:	Sat, 30 Sep 2006 15:50:58 +0000 (UTC)
From:	Oleg Verych <olecom@...wer.upol.cz>
To:	linux-kernel@...r.kernel.org
Subject:  Re: [patch 2.6.18-git] RTC class, Kconfig improvements

On 2006-09-29, David Brownell <david-b@...bell.net> wrote:
>
> *[ RESEND third time ]*
>
> Small updates to make the RTC class Kconfig text be more informative.
> This should help folk used to the drivers/char/rtc.c support, or a
> single RTC, be slightly less surprised by the differences.
>
> Also, adds a new RTC_DEBUG option to predefine DEBUG in the framework
> and its drivers, while debugging.  That's getting to be a standard
> idiom, and it's pretty useful.
>
> Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
>

ACK

> Index: g26/drivers/rtc/Kconfig
>===================================================================
> --- g26.orig/drivers/rtc/Kconfig	2006-08-19 02:02:45.000000000 -0700
> +++ g26/drivers/rtc/Kconfig	2006-08-19 10:08:23.000000000 -0700
> @@ -37,6 +37,13 @@ config RTC_HCTOSYS_DEVICE
>  	  The RTC device that will be used as the source for
>  	  the system time, usually rtc0.
>  
> +config RTC_DEBUG
> +	bool "RTC debug support"
> +	depends on RTC_CLASS = y
> +	help
> +	  Say yes here to enable debugging support in the RTC framework
> +	  and individual RTC drivers.
> +
>  comment "RTC interfaces"
>  	depends on RTC_CLASS
>  
> @@ -45,8 +52,8 @@ config RTC_INTF_SYSFS
>  	depends on RTC_CLASS && SYSFS
>  	default RTC_CLASS
>  	help
> -	  Say yes here if you want to use your RTC using the sysfs
> -	  interface, /sys/class/rtc/rtcX .
> +	  Say yes here if you want to use your RTCs using sysfs interfaces,
> +	  /sys/class/rtc/rtc0 through /sys/.../rtcN.
>  
>  	  This driver can also be built as a module. If so, the module
>  	  will be called rtc-sysfs.
> @@ -56,8 +63,9 @@ config RTC_INTF_PROC
>  	depends on RTC_CLASS && PROC_FS
>  	default RTC_CLASS
>  	help
> -	  Say yes here if you want to use your RTC using the proc
> -	  interface, /proc/driver/rtc .
> +	  Say yes here if you want to use your first RTC through the proc
> +	  interface, /proc/driver/rtc.  Other RTCs will not be available
> +	  through that API.
>  
>  	  This driver can also be built as a module. If so, the module
>  	  will be called rtc-proc.
> @@ -67,8 +75,11 @@ config RTC_INTF_DEV
>  	depends on RTC_CLASS
>  	default RTC_CLASS
>  	help
> -	  Say yes here if you want to use your RTC using the dev
> -	  interface, /dev/rtc .
> +	  Say yes here if you want to use your RTCs using the /dev
> +	  interfaces, which "udev" sets up as /dev/rtc0 through
> +	  /dev/rtcN.  You may want to set up a symbolic link so one
> +	  of these can be accessed as /dev/rtc, which is a name
> +	  expected by "hwclock" and some other programs.
>  
>  	  This driver can also be built as a module. If so, the module
>  	  will be called rtc-dev.
> @@ -78,7 +89,8 @@ config RTC_INTF_DEV_UIE_EMUL
>  	depends on RTC_INTF_DEV
>  	help
>  	  Provides an emulation for RTC_UIE if the underlaying rtc chip
> -	  driver did not provide RTC_UIE ioctls.
> +	  driver does not expose RTC_UIE ioctls.  Those requests generate
> +	  once-per-second update interrupts, used for synchronization.
>  
>  comment "RTC drivers"
>  	depends on RTC_CLASS
> Index: g26/drivers/rtc/Makefile
>===================================================================
> --- g26.orig/drivers/rtc/Makefile	2006-08-19 10:08:09.000000000 -0700
> +++ g26/drivers/rtc/Makefile	2006-08-19 10:09:07.000000000 -0700
> @@ -2,6 +2,10 @@
>  # Makefile for RTC class/drivers.
>  #
>  
> +ifeq ($(CONFIG_RTC_DEBUG),y)
> +	EXTRA_CFLAGS		+= -DDEBUG
> +endif
> +
>  obj-$(CONFIG_RTC_LIB)		+= rtc-lib.o
>  obj-$(CONFIG_RTC_HCTOSYS)	+= hctosys.o
>  obj-$(CONFIG_RTC_CLASS)		+= rtc-core.o

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