kconfig: move CONFIG_SYS_HZ to lib/Kconfig

CONFIG_SYS_HZ is always defined as 1000 in config_fallbacks.h
(but some boards still have redundant definitions).

This commit moves the definition and the document in README to
Kconfig.  Since lib/Kconfig can assure that CONFIG_SYS_HZ is 1000,
the sanity check in lib/time.c should be removed.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Reviewed-by: Marek Vasut <marex@denx.de>

README

@@ -623,13 +623,6 @@ The following options need to be configured:
 		exists, unlike the similar options in the Linux kernel. Do not
 		set these options unless they apply!
 
-- CPU timer options:
-		CONFIG_SYS_HZ
-
-		The frequency of the timer returned by get_timer().
-		get_timer() must operate in milliseconds and this CONFIG
-		option must be set to 1000.
-
 - Linux Kernel Interface:
 		CONFIG_CLOCKS_IN_MHZ
 

include/config_fallbacks.h

@@ -79,10 +79,6 @@
 #define CONFIG_SYS_PROMPT	"=> "
 #endif
 
-#ifndef CONFIG_SYS_HZ
-#define CONFIG_SYS_HZ		1000
-#endif
-
 #ifndef CONFIG_FIT_SIGNATURE
 #define CONFIG_IMAGE_FORMAT_LEGACY
 #endif

include/configs/cm_fx6.h

@@ -19,7 +19,6 @@
 #define CONFIG_MX6
 #define CONFIG_SYS_LITTLE_ENDIAN
 #define CONFIG_MACH_TYPE		4273
-#define CONFIG_SYS_HZ			1000
 
 #ifndef CONFIG_SPL_BUILD
 #define CONFIG_DM

include/configs/edb93xx.h

@@ -89,7 +89,6 @@
 #define CONFIG_EP93XX		1		/* in a Cirrus Logic 93xx SoC */
 
 #define CONFIG_SYS_CLK_FREQ	14745600	/* EP93xx has a 14.7456 clock */
-#define CONFIG_SYS_HZ		1000		/* decr freq: 1 ms ticks */
 #undef CONFIG_USE_IRQ				/* Don't need IRQ/FIQ */
 
 /* Monitor configuration */

include/configs/ks2_evm.h

@@ -23,7 +23,6 @@
 #define CONFIG_ARMV7
 #define CONFIG_ARCH_CPU_INIT
 #define CONFIG_SYS_ARCH_TIMER
-#define CONFIG_SYS_HZ			1000
 #define CONFIG_SYS_TEXT_BASE		0x0c001000
 #define CONFIG_SPL_TARGET		"u-boot-spi.gph"
 #define CONFIG_SYS_DCACHE_OFF

include/configs/ls1021aqds.h

@@ -360,7 +360,6 @@ unsigned long get_board_ddr_clk(void);
 #define CONFIG_SYS_MEMTEST_END		0x9fffffff
 
 #define CONFIG_SYS_LOAD_ADDR		0x82000000
-#define CONFIG_SYS_HZ			1000
 
 /*
  * Stack sizes

include/configs/ls1021atwr.h

@@ -261,7 +261,6 @@
 #define CONFIG_SYS_MEMTEST_END		0x9fffffff
 
 #define CONFIG_SYS_LOAD_ADDR		0x82000000
-#define CONFIG_SYS_HZ			1000
 
 /*
  * Stack sizes

include/configs/ls2085a_common.h

@@ -253,8 +253,6 @@
 
 #define CONFIG_NR_DRAM_BANKS		3
 
-#define CONFIG_SYS_HZ			1000
-
 #define CONFIG_HWCONFIG
 #define HWCONFIG_BUFFER_SIZE		128
 

include/configs/sunxi-common.h

@@ -105,8 +105,6 @@
 /* standalone support */
 #define CONFIG_STANDALONE_LOAD_ADDR	0x42000000
 
-#define CONFIG_SYS_HZ			1000
-
 /* baudrate */
 #define CONFIG_BAUDRATE			115200
 

include/configs/tqma6.h

@@ -450,7 +450,6 @@
 #define CONFIG_SYS_BARGSIZE		CONFIG_SYS_CBSIZE
 
 #define CONFIG_SYS_LOAD_ADDR		CONFIG_LOADADDR
-#define CONFIG_SYS_HZ			1000
 
 #define CONFIG_CMDLINE_EDITING
 #define CONFIG_STACKSIZE		(128u * SZ_1K)

lib/Kconfig

@@ -8,4 +8,12 @@ config CC_OPTIMIZE_LIBS_FOR_SPEED
 
 	  If unsure, say N.
 
+config SYS_HZ
+	int
+	default 1000
+	help
+	  The frequency of the timer returned by get_timer().
+	  get_timer() must operate in milliseconds and this option must be
+	  set to 1000.
+
 endmenu

lib/time.c

@@ -10,10 +10,6 @@
 #include <div64.h>
 #include <asm/io.h>
 
-#if CONFIG_SYS_HZ != 1000
-#warning "CONFIG_SYS_HZ must be 1000 and should not be defined by platforms"
-#endif
-
 #ifndef CONFIG_WD_PERIOD
 # define CONFIG_WD_PERIOD	(10 * 1000 * 1000)	/* 10 seconds default */
 #endif